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Publisher: Elsevier   (Total: 3157 journals)

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Showing 1 - 200 of 3157 Journals sorted alphabetically
A Practical Logic of Cognitive Systems     Full-text available via subscription   (Followers: 9)
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 35, SJR: 1.655, CiteScore: 2)
Academic Radiology     Hybrid Journal   (Followers: 24, SJR: 1.015, CiteScore: 2)
Accident Analysis & Prevention     Partially Free   (Followers: 96, SJR: 1.462, CiteScore: 3)
Accounting Forum     Hybrid Journal   (Followers: 27, SJR: 0.932, CiteScore: 2)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 37, SJR: 1.771, CiteScore: 3)
Achievements in the Life Sciences     Open Access   (Followers: 5)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 7)
Acta Astronautica     Hybrid Journal   (Followers: 415, SJR: 0.758, CiteScore: 2)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Biomaterialia     Hybrid Journal   (Followers: 27, SJR: 1.967, CiteScore: 7)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 2)
Acta de Investigación Psicológica     Open Access   (Followers: 3)
Acta Ecologica Sinica     Open Access   (Followers: 10, SJR: 0.18, CiteScore: 1)
Acta Haematologica Polonica     Free   (Followers: 1, SJR: 0.128, CiteScore: 0)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.661, CiteScore: 2)
Acta Materialia     Hybrid Journal   (Followers: 261, SJR: 3.263, CiteScore: 6)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.504, CiteScore: 1)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.542, CiteScore: 1)
Acta Oecologica     Hybrid Journal   (Followers: 12, SJR: 0.834, CiteScore: 2)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription  
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.307, CiteScore: 0)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 1, SJR: 1.793, CiteScore: 6)
Acta Poética     Open Access   (Followers: 4, SJR: 0.101, CiteScore: 0)
Acta Psychologica     Hybrid Journal   (Followers: 27, SJR: 1.331, CiteScore: 2)
Acta Sociológica     Open Access   (Followers: 1)
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.052, CiteScore: 2)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 3, SJR: 0.374, CiteScore: 1)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 2)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.344, CiteScore: 1)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 1)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 6, SJR: 0.19, CiteScore: 0)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 3)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 7)
Acute Pain     Full-text available via subscription   (Followers: 14, SJR: 2.671, CiteScore: 5)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.53, CiteScore: 4)
Addictive Behaviors     Hybrid Journal   (Followers: 17, SJR: 1.29, CiteScore: 3)
Addictive Behaviors Reports     Open Access   (Followers: 8, SJR: 0.755, CiteScore: 2)
Additive Manufacturing     Hybrid Journal   (Followers: 10, SJR: 2.611, CiteScore: 8)
Additives for Polymers     Full-text available via subscription   (Followers: 23)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 159, SJR: 4.09, CiteScore: 13)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.167, CiteScore: 4)
Advanced Powder Technology     Hybrid Journal   (Followers: 17, SJR: 0.694, CiteScore: 3)
Advances in Accounting     Hybrid Journal   (Followers: 8, SJR: 0.277, CiteScore: 1)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.384, CiteScore: 5)
Advances in Anesthesia     Full-text available via subscription   (Followers: 28, SJR: 0.126, CiteScore: 0)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 10, SJR: 0.992, CiteScore: 1)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 11, SJR: 1.551, CiteScore: 4)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 24, SJR: 2.089, CiteScore: 5)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 14, SJR: 0.572, CiteScore: 2)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.61, CiteScore: 7)
Advances in Botanical Research     Full-text available via subscription   (Followers: 2, SJR: 0.686, CiteScore: 2)
Advances in Cancer Research     Full-text available via subscription   (Followers: 33, SJR: 3.043, CiteScore: 6)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 1.453, CiteScore: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 1.992, CiteScore: 5)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 4)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 27, SJR: 0.156, CiteScore: 1)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.713, CiteScore: 1)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 9, SJR: 1.316, CiteScore: 2)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 26, SJR: 1.562, CiteScore: 3)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19, SJR: 1.977, CiteScore: 8)
Advances in Computers     Full-text available via subscription   (Followers: 14, SJR: 0.205, CiteScore: 1)
Advances in Dermatology     Full-text available via subscription   (Followers: 15)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 12)
Advances in Digestive Medicine     Open Access   (Followers: 9)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 25)
Advances in Ecological Research     Full-text available via subscription   (Followers: 44, SJR: 2.524, CiteScore: 4)
Advances in Engineering Software     Hybrid Journal   (Followers: 28, SJR: 1.159, CiteScore: 4)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 8)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 46, SJR: 5.39, CiteScore: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 1)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 59, SJR: 0.591, CiteScore: 2)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Genetics     Full-text available via subscription   (Followers: 16, SJR: 1.354, CiteScore: 4)
Advances in Genome Biology     Full-text available via subscription   (Followers: 8, SJR: 12.74, CiteScore: 13)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 1.193, CiteScore: 3)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 23, SJR: 0.368, CiteScore: 1)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 12, SJR: 0.749, CiteScore: 3)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.193, CiteScore: 0)
Advances in Immunology     Full-text available via subscription   (Followers: 36, SJR: 4.433, CiteScore: 6)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 1.163, CiteScore: 2)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 2, SJR: 1.938, CiteScore: 3)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6, SJR: 0.176, CiteScore: 0)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 3)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.682, CiteScore: 2)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Marine Biology     Full-text available via subscription   (Followers: 18, SJR: 0.88, CiteScore: 2)
Advances in Mathematics     Full-text available via subscription   (Followers: 11, SJR: 3.027, CiteScore: 2)
Advances in Medical Sciences     Hybrid Journal   (Followers: 7, SJR: 0.694, CiteScore: 2)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.158, CiteScore: 3)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 23)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 8)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.182, CiteScore: 0)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 3)
Advances in Oncobiology     Full-text available via subscription   (Followers: 2)
Advances in Organ Biology     Full-text available via subscription   (Followers: 1)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 17, SJR: 1.875, CiteScore: 4)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.174, CiteScore: 0)
Advances in Parasitology     Full-text available via subscription   (Followers: 5, SJR: 1.579, CiteScore: 4)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.461, CiteScore: 1)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 12)
Advances in Pharmacology     Full-text available via subscription   (Followers: 16, SJR: 1.536, CiteScore: 3)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.574, CiteScore: 1)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.109, CiteScore: 1)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 10)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20, SJR: 0.791, CiteScore: 2)
Advances in Psychology     Full-text available via subscription   (Followers: 64)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6, SJR: 0.371, CiteScore: 1)
Advances in Radiation Oncology     Open Access   (SJR: 0.263, CiteScore: 1)
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.101, CiteScore: 0)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 6)
Advances in Space Research     Full-text available via subscription   (Followers: 404, SJR: 0.569, CiteScore: 2)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Surgery     Full-text available via subscription   (Followers: 11, SJR: 0.555, CiteScore: 2)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 34, SJR: 2.208, CiteScore: 4)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 18)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 14)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 2.262, CiteScore: 5)
Advances in Water Resources     Hybrid Journal   (Followers: 47, SJR: 1.551, CiteScore: 3)
Aeolian Research     Hybrid Journal   (Followers: 6, SJR: 1.117, CiteScore: 3)
Aerospace Science and Technology     Hybrid Journal   (Followers: 350, SJR: 0.796, CiteScore: 3)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.42, CiteScore: 2)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.296, CiteScore: 0)
Ageing Research Reviews     Hybrid Journal   (Followers: 11, SJR: 3.671, CiteScore: 9)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 456, SJR: 1.238, CiteScore: 3)
Agri Gene     Hybrid Journal   (Followers: 1, SJR: 0.13, CiteScore: 0)
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 17, SJR: 1.818, CiteScore: 5)
Agricultural Systems     Hybrid Journal   (Followers: 31, SJR: 1.156, CiteScore: 4)
Agricultural Water Management     Hybrid Journal   (Followers: 42, SJR: 1.272, CiteScore: 3)
Agriculture and Agricultural Science Procedia     Open Access   (Followers: 4)
Agriculture and Natural Resources     Open Access   (Followers: 3)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 57, SJR: 1.747, CiteScore: 4)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.589, CiteScore: 3)
Air Medical J.     Hybrid Journal   (Followers: 6, SJR: 0.26, CiteScore: 0)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.19, CiteScore: 0)
Alcohol     Hybrid Journal   (Followers: 12, SJR: 1.153, CiteScore: 3)
Alcoholism and Drug Addiction     Open Access   (Followers: 11)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.604, CiteScore: 3)
Alexandria J. of Medicine     Open Access   (Followers: 1, SJR: 0.191, CiteScore: 1)
Algal Research     Partially Free   (Followers: 10, SJR: 1.142, CiteScore: 4)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.504, CiteScore: 1)
Allergology Intl.     Open Access   (Followers: 5, SJR: 1.148, CiteScore: 2)
Alpha Omegan     Full-text available via subscription   (SJR: 3.521, CiteScore: 6)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 10, SJR: 0.201, CiteScore: 1)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 51, SJR: 4.66, CiteScore: 10)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 4, SJR: 1.796, CiteScore: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 4, SJR: 1.108, CiteScore: 3)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 6)
American Heart J.     Hybrid Journal   (Followers: 53, SJR: 3.267, CiteScore: 4)
American J. of Cardiology     Hybrid Journal   (Followers: 56, SJR: 1.93, CiteScore: 3)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 44, SJR: 0.604, CiteScore: 1)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 10)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.524, CiteScore: 3)
American J. of Human Genetics     Hybrid Journal   (Followers: 34, SJR: 7.45, CiteScore: 8)
American J. of Infection Control     Hybrid Journal   (Followers: 29, SJR: 1.062, CiteScore: 2)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 35, SJR: 2.973, CiteScore: 4)
American J. of Medicine     Hybrid Journal   (Followers: 47)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3, SJR: 1.967, CiteScore: 2)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 221, SJR: 2.7, CiteScore: 4)
American J. of Ophthalmology     Hybrid Journal   (Followers: 66, SJR: 3.184, CiteScore: 4)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 5, SJR: 0.265, CiteScore: 0)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.289, CiteScore: 1)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, CiteScore: 1)
American J. of Pathology     Hybrid Journal   (Followers: 28, SJR: 2.139, CiteScore: 4)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 28, SJR: 2.164, CiteScore: 4)
American J. of Surgery     Hybrid Journal   (Followers: 38, SJR: 1.141, CiteScore: 2)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.767, CiteScore: 1)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 7)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.144, CiteScore: 3)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 63, SJR: 0.138, CiteScore: 0)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 18, SJR: 0.411, CiteScore: 1)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 3, SJR: 0.277, CiteScore: 0)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription  
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 5, SJR: 4.849, CiteScore: 10)
Analytica Chimica Acta     Hybrid Journal   (Followers: 42, SJR: 1.512, CiteScore: 5)
Analytical Biochemistry     Hybrid Journal   (Followers: 183, SJR: 0.633, CiteScore: 2)
Analytical Chemistry Research     Open Access   (Followers: 12, SJR: 0.411, CiteScore: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 12)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 2)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 23, SJR: 0.683, CiteScore: 2)
Angiología     Full-text available via subscription   (SJR: 0.121, CiteScore: 0)
Angiologia e Cirurgia Vascular     Open Access   (Followers: 1, SJR: 0.111, CiteScore: 0)
Animal Behaviour     Hybrid Journal   (Followers: 204, SJR: 1.58, CiteScore: 3)

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Journal Cover
Advanced Powder Technology
Journal Prestige (SJR): 0.694
Citation Impact (citeScore): 3
Number of Followers: 17  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0921-8831 - ISSN (Online) 1568-5527
Published by Elsevier Homepage  [3157 journals]
  • Effects of [Bmim][Cl] ionic liquid with different concentrations on the
           functional groups and wettability of coal
    • Abstract: Publication date: Available online 14 January 2019Source: Advanced Powder TechnologyAuthor(s): Ni Guanhua, Li Zhaong, Sun Qian, Li Shang, Dong Kai In view of high dust concentration in coal mining and difficulty of traditional water injection in coal wetting, the effects of [Bmim][Cl] (1-butyl-3-methylimidazole chloride) ionic liquid with different concentrations on wetting performance and functional groups of coals have been studied. Optical droplet morphology analysis system and FTIR (Fourier transform infrared spectrometer) were used. The results showed that coal samples treated with [Bmim][Cl] ionic liquid had a significant change in the content of aliphatic groups. In the coal samples treated with 0% concentration [Bmim][Cl], the content of CH2 groups was 77.86%, CH3 groups was 14.07%. When [Bmim][Cl] concentration was 4%, the content of CH2 groups decreased to 24.55%, CH3 groups increased to 61.25%. Besides, the contact angle is the minimal of a 41.1° at 4% ionic liquid concentration. The relationship between contact angles and contents of functional groups were analyzed. Results showed that the content of CH3 groups and CH2 groups had the greatest effect on the contact angle and 4% [Bmim][Cl] ionic liquid treatment can effectively reduce the contact angle and improve the coal wettability. It is of great significance to increase coal wettability and reduce dust generation by changing the contents of functional groups.Graphical abstractGraphical abstract for this article
       
  • Formation of pores and amorphous-nanocrystalline phases in porous TiNi
           alloys made by self-propagating high-temperature synthesis (SHS)
    • Abstract: Publication date: Available online 14 January 2019Source: Advanced Powder TechnologyAuthor(s): Gunther Victor, Yasenchuk Yuri, Chekalkin Timofey, Marchenko Ekaterina, Gunther Sergey, Baigonakova Gulsharat, Hodorenko Valentina, Kang Ji-hoon, Weiss Sabine, Obrosov Aleksei The objective of this study was to examine the mechanism how the surface of porous TiNi compounds produced by SHS method evolves. The prepared samples were investigated using light-microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDS). The results indicated that the surface of all pores is represented by a granular stratum due to dendrite liquation by peritectic crystallization mechanism. The voids of 2–15 μm in size are formed owing to a capillary spreading of the liquid. Reaction gases with dissociated carbon, nitrogen, and oxygen are responsible for heat-and-mass transfer through the forming pores. High pressure-temperature effect of reaction gases on the melt causes the forming voids to coalesce, as well as transfers the peritectic liquid (PL) throughout the open pores catalyzing a distinctive spitted topography. It is through the chemisorption of gasiform nonmetallics by the pore surface melt, where these impurities are chemically bound, that it was formed a massive corrosion-resistant amorphous-nanocrystalline stratified shell deduced as an intermetallic oxycarbonitride layer.Graphical abstractGraphical abstract for this article
       
  • Montmorillonite/graphene oxide nanocomposite as superior adsorbent for the
           adsorption of Rhodamine B and Nickel ion in binary system
    • Abstract: Publication date: Available online 14 January 2019Source: Advanced Powder TechnologyAuthor(s): M. Neelaveni, P. Santhana Krishnan, R. Ramya, G. Sonia Theres, K. Shanthi A series of montmorillonite reduced graphene oxide (MrGO) composites were synthesized using different ratios (5, 10, 15 and 20) of montmorillonite (MMt) to GO. The synthesized composites were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, surface area analyzer (BET), and Fourier transform- infrared spectroscopy. The adsorption capacity and efficiency of the synthesised composites were examined towards removal of Rhodamine B (RhB) and Nickel ion (Ni2+). The results were compared with that of GO and commercial MMt clay. The kinetic sorption models were evaluated, and it was observed that sorption follows the pseudo-second-order kinetics. Adsorption isotherm was best fit into the Langmuir model (R2 = 0.996 for RhB & 0.957 for Ni2+). Among all the synthesized composites, MrGO-2, a composite of GO and montmorillonite with (1:10) ratio, showed maximum activity towards the adsorption of Rhodamine B and Ni2+ calculated to be 625 mg/g and 178 mg/g respectively at neutral pH condition. From the calculated ΔG (−3.99 & −0.71 kJ mol−1), ΔH (28.6 & 4.61 kJ mol−1) and ΔS (−107.5 & −17.8 J mol−1 K) values for RhB & Ni2+ respectively, it can be unambiguously inferred that the adsorption process was feasible, endothermic and exhibiting least randomness, respectively. The prepared MrGO composite showed good adsorption capacity towards efficient removal of RhB and Ni2+ in single as well as binary system.Graphical abstractGraphical abstract for this article
       
  • Micronized plastic waste recycling using two-disc tribo-electrostatic
           separation process
    • Abstract: Publication date: Available online 14 January 2019Source: Advanced Powder TechnologyAuthor(s): Bouhamri Noureddine, Zelmat Mohamed Elmouloud, Amar Tilmatine Triboelectrostatic separation of millimeter-size granular mixtures is nowadays widely used in the recycling industry. However, the separation of micronized particles of an average granulometric size of 100 µm is still inefficient. This paper is aimed to carry out an experimental investigation of a triboelectrostatic separation process based on a fluidized bed tribocharging system produced between a pair of rotating aluminum disks supplied by two high-voltage DC supplies of opposite polarities. The granular mixture used in this work is composed of micronized white pure virgin PolyVinyl Chloride particles (WPVC) and gray PolyVinyl Chloride particles that contain a small percentage of carbon (GPVC) of average size 100 μm. Moreover, a homemade method was developed to estimate the purity of the separated products. It was deduced that the separation outcome, in terms of recovery and purity, is efficient and depends on several factors: the high-voltage level, the rotating speed of the disks, the fluidization rate, the total mass of the fluidized bed and the composition ratio of the granular mixture.Graphical abstractSchematic representation of the separation process of micronized plastic particles. 1-Rotating disks; 2-Rotation shaft; 3-PTFE enclosure; 4-Sponge wiper; 5-Air injection; 6-fluidization chamber; 7-Collector compartments. The fluidized bed has a cross-sectional area, a porous plate uniformly distributes the air in the fluidized bed. The continual particle-to-particle and particle–wall collisions lead to the tribo-electrification of the particles. A high voltage is applied between two rotating steel disk electrodes with a constant inter-electrodes distance of 8 cm, and immersed in the fluidized bed, i.e., approximately a 3-cm peripheral band of the disk is constantly immersed in the fluidized bed (Fig. 1). The separation process is simple: the positively charges particles are pinned to the negative electrode and vice-versa.Graphical abstract for this article
       
  • Synthesis and characterization of α-Fe2O3/polyaniline nanotube composite
           as electrochemical sensor for uric acid detection
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): M.R. Mahmoudian, W.J. Basirun, M. Sookhakian, Pei Meng Woi, E. Zalnezhad, H. Hazarkhani, Y. Alias We report the synthesis of α-Fe2O3/polyaniline nanotube (PAn NTs) composite as an electrochemical sensor for uric acid (UA) detection. Field emission scanning electron microscopy (FESEM) indicates a hexagonal shape of the α-Fe2O3 while a nanotube morphology of the PAn. Impedance spectroscopy results confirm a significant decrease in the charge transfer resistance of the glassy carbon electrode (GCE) modified with α-Fe2O3/PAn NTs due to the presence of PAn NTs. The results show that the increase in the conductivity of α-Fe2O3 in the presence of PAnNTs could improve the catalytic performance of α-Fe2O3/PAn NTs composite, compared to the pure α-Fe2O3 nanoparticles. From differential pulse voltammetry, a linear working range for the concentration of UA between 0.01 µM and 5 µM, with a LOD of 0.038 µM (S/N = 3) was obtained. The sensitivity of the linear segment is 0.433 μA µM−1. The reliability of the modified electrode towards the detection of UA was investigated in the presence of interfering acids such as ascorbic acid, citric acid and succinic acid.Graphical abstractGraphical abstract for this article
       
  • A novel poly(triazine imide) hollow tube/ZnO heterojunction for
           tetracycline hydrochloride degradation under visible light irradiation
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Xin Yan, Jie Qin, Guotao Ning, Jintong Li, Tao Ai, Xinghua Su, Zhenjun Wang A novel poly(triazine imide) hollow tube (PTI)/ZnO heterojunction was prepared by a molten salts method. The photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy, respectively. The results showed the ZnO nanoparticles were successfully coupled into the PTI hollow tube to form PTI/ZnO heterojunction. The degradation of tetracycline hydrochloride (TC) under visible light irradiation was used to evaluate the activity of photocatalyst. The PTI/ZnO-6 wt% heterojunction exhibits the highest photocatalytic activity, which can degrade almost all TC within 90 min. The kinetic constant of degradation reaction with PTI/ZnO-6 wt% heterojunction (0.034 min−1) is about 5 times as high as that of the PTI (0.0070 min−1). A possible photocatalytic mechanism for heterojunction according to the energy-band theory was proposed.Graphical abstractGraphical abstract for this article
       
  • Study of synthesis of mordenite zeolite/MIL-101 (Cr) metal–organic
           framework compounds with various methods as bi-functional adsorbent
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): M. Fallah, Sh. Sohrabnezhad In the present study, for the first time the preparation of mordenite zeolite/MIL-101(Cr) metal – organic framework (MOF) samples (MOR/MIL-101(Cr)) with different methods was suggested. The preparation of compounds was performed via hydrothermal (H), solvothermal (S) and refluxing methods. The properties of synthesized compounds and individual MOF and MOR zeolite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption–desorption measurement and thermo gravimetric analysis (TGA). The XRD results indicated diffraction peaks for each two compounds (MOR and MIL-101) in synthesized samples. The SEM and TEM images showed mixture of MOF and mordenite zeolite via refluxing and solvothermal method. In hydrothermal method, a new composite were fabricated by diffuse of MIL-101 particles with octahedral and spherical morphology in plate shaped MOR zeolite. The nitrogen sorption isotherms characterized microporous cages in MOR/MIL-101 samples and individual samples. The BET results showed the surface areas of all synthesized compounds were smaller than individual MOF and MOR zeolite. Based on TGA plots, synthesized MOR/MOF compounds were more thermally stable compared to the isolated MIL-101(Cr). All prepared compounds were tested as bi-functional adsorbent in removal of acidic/anionic methyl orange (MO) and cationic methylene blue (MB) dyes simultaneously. The acidity from framework Al-O(H)-Si sites in MOR and basicity from amine groups in MIL-101 obtained by post-synthetic modification. Among the synthesized compounds, MOR/MIL-101 composite by solvothermal method were selected as the best bi-functional adsorbent.Graphical abstractGraphical abstract for this article
       
  • Effect of particle morphology on mechanical properties of liquid marbles
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Saeid Azizian, Syuji Fujii, Moe Kasahara, Hans-Jürgen Butt, Michael Kappl In order to better understand the influence of the shape of solid particles on the stability of liquid marbles, we investigated liquid marbles stabilized by hydrophobized calcium carbonate particles with spherical and rod-shaped morphologies. Static properties, such as the effective surface tension, and the dynamic behavior i.e. the compression-decompression features for several cycles of the liquid marbles were investigated. Liquid marbles stabilized with spherical CaCO3 particles show an elastic response to mechanical deformation almost up to collapse. In contrast, liquid marbles prepared with rod-like particles exhibit a more plastic response to compression. It is concluded that the main differences in behavior of the prepared liquid marbles arise from how the solid particles can arrange/orient at the air/water interface.Graphical abstractGraphical abstract for this article
       
  • Numerical study on liquid-solid flow characteristics in inverse
           circulating fluidized beds
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Yangfan Song, Zeneng Sun, Chao Zhang, Jesse Zhu, Xiaofeng Lu The flow behavior of particles in inverse liquid-solid circulating fluidized beds was simulated using the Eulerian-Eulerian approach incorporating the kinetic theory of granular flow. The Syamlal-O’Brien drag model was used to account for the interphase interaction between the liquid and solids phases. A detailed description of the model equations used in this work has been presented. Predicted results were compared with the experimental data obtained by other group members. A good agreement between the numerical simulations and experimental results has been achieved. The inverse flow characteristics of particles were studied using a single type of particles and multiple types of particles with different densities under different liquid velocities and solids flow rates. The results indicated that for the particles with different densities, 950 kg/m3, 850 kg/m3 and 640 kg/m3, the cross-sectional average solids holdup along the axis was uniform and the radial flow structures at different bed heights were identical. Particles moved from the walls to the center at the top region of the bed. Such tendency diminished as the particles move downwards. The axial velocities of solid particles were higher in the center and lower near the walls. For the particles with a density of 28 kg/m3, due to the randomly generated vortexes of particles, the solids holdup radial distributions and the velocities of particles were more irregular. For the mixed particles with two different densities of 850 kg/m3 and 950 kg/m3, the trend of solids holdup radial distribution, and the trend of the lateral and axial velocities of each particle group were similar to those in the simulation using the single-density particles.Graphical abstractGraphical abstract for this article
       
  • Mechanically activated combustion synthesis of Ti3AlC2/Al2O3 nanocomposite
           from TiO2/Al/C powder mixtures
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): M. Zarezadeh Mehrizi, R. Beygi, Gh. Eisaabadi B, M. Velashjerdi, F. Nematzadeh Ti3AlC2/Al2O3 nanocomposite powder was synthesized by mechanical-activation-assisted combustion synthesis of TiO2, Al and C powder mixtures. The effect of mechanical activation time of 3TiO2-5Al-2C powder mixtures, via high energy planetary milling (up to 20 h), on the phase transformation after combustion synthesis was experimentally investigated. X-ray diffraction (XRD) was used to characterize as-milled and thermally treated powder mixtures. The morphology and microstructure of as-fabricated products were also studied by scanning electron microscopy (SEM) and field-emission gun electron microscopy (FESEM). The experimental results showed that mechanical activation via ball-milling increased the initial extra energy of TiO2-Al-C powder mixtures, which is needed to enhance the reactivity of powder mixture and make it possible to ignite and sustain the combustion reaction to form Ti3AlC2/Al2O3 nanocomposite. TiC, AlTi and Al2O3 intermediate phases were formed when the initial 10 h milled powder mixtures were thermally treated. The desired Ti3AlC2/Al2O3 nanocomposite was synthesized after thermal treatment of 20 h milled powder and consequent combustion synthesis and FESEM result confirmed that produced powder had nanocrystalline structure.Graphical abstractGraphical abstract for this article
       
  • A further investigation on the MnO2-Fe2O3 system roasted under CO-CO2
           atmosphere
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Bingbing Liu, Yuanbo Zhang, Jia Wang, Juan Wang, Zijian Su, Guanghui Li, Tao Jiang Investigations on the MnO2-Fe2O3 system roasted in air has been reported in our previous work. This study further investigated the MnO2-Fe2O3 system roasted under CO-CO2 atmosphere. Extensive investigations were concentrated on the reduction of simplex iron oxides or manganese oxides, and little attention were paid on the reduction of MnO2-Fe2O3 system regarding to interactive reactions between them. In this work, it was found that spinel-type MnxFe3−xO4 with high magnetism formed easily under CO-CO2 atmosphere. The reduction and thermodynamic analyses of pure MnFe2O4 were also researched to better understand the reduction behaviors of MnO2-Fe2O3 system. Phase study showed that a series of Mn-Fe composite oxides, including MnxFe3−xO4 and (MnO)y(FeO)1−y, generated during the reduction of MnO2-Fe2O3 system. MnxFe3−xO4 was readily generated under CO content of 2.5–25 vol% at 1000 °C. With further increase of CO content, MnxFe3−xO4 was reduced to (MnO)y(FeO)1−y and then to MnO and metallic iron. Reduction of manganese oxides, iron oxides and manganese ferrites happened concurrently during the reduction of MnO2-Fe2O3 system. And the reduction of MnO2, Fe2O3, Fe3O4 and MnFe2O4 were compared by TG and thermodynamic analyses. In addition, the morphology evolution and magnetism change of the MnO2-Fe2O3 system reduced under different CO contents were also studied.Graphical abstractGraphical abstract for this article
       
  • Photocatalytic properties of solution combustion synthesized ZnO powders
           using mixture of CTAB and glycine and citric acid fuels
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): H. Vahdat Vasei, S.M. Masoudpanah, M. Adeli, M.R. Aboutalebi Zinc oxide (ZnO) powders have been prepared by solution combustion synthesis method using combination of cetyltrimethylammonium bromide (CTAB) with glycine and citric acid fuels. The combustion behavior, phase evolution, microstructure, optical properties and photocatalytic performance were compared by thermal analysis, X-ray diffractometry, electron microscopy, and diffuse reflectance and photoluminescence spectrometry techniques at various fuel to oxidant ratios (ϕ = 0.5, 0.75, 1 and 1.5). Single phase and well-crystalline ZnO powders were directly formed regardless of fuel type and fuel content. The higher specific surface area and pore volume of the as-combusted ZnO powders using mixture of CTAB and citric acid fuels increased with fuel content. The lower band gap energies (3.10–3.16 eV) of the as-combusted ZnO powders in the presence of glycine fuel were attributed to their lower crystallinity, as confirmed by higher visible emission in photoluminescence spectra. The higher photodegradation of methylene blue under ultraviolet light irradiation was achieved by the as-combusted ZnO powders by using CTAB-citric acid mixed fuels, due to their good crystallinity and higher specific surface area.Graphical abstract(A) PL spectra of the as-combusted ZnO powders using (a) the mixture of CTAB and glycine fuels and (b) the mixture of CTAB and citric acid fuels at ϕ=1 and (the inset shows normalized PL spectra) and (B) the energy band diagram.Graphical abstract for this article
       
  • Self-assembling ε-Fe2O3/SiO2 nanoparticles to nanoflakes with
           paramagnetic-class properties via a milling-etching route
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Yunguo Wang, Ji Ma, Sizhi Zuo-Jiang, Yanli Li, Guoqi Li, Kezheng Chen In this work, the milling-etching route is designed to synthesize nanoflakes with high-content ε-Fe2O3 phase, which is environmental friendly and more desirable for energy-efficient mass production of ε-Fe2O3 phase than conventional thermal treatment methods. More strikingly, this product conforms to the characteristics of paramagnetic-class properties, and our study shows that the unique property derived from ε-Fe2O3 phase is intimately related to large lattice strain and a few of small grains of ε-Fe2O3 based on Rietveld method and the law of approach to saturation. Relaxivities confirm the paramagnetic-class product has the potential to become a candidate as contrast agent in magnetic resonance imaging application filed. Our work not only sheds light on the preparation of ε-Fe2O3 phase, but also enables a new insight into the development of functional ε-Fe2O3 material in practical magnetically-relevant applications.Graphical abstractParamagnetic-class nanoflakes with high-content ε-Fe2O3 phase were synthesized via milling-etching route.Graphical abstract for this article
       
  • Understanding stability relationships among three curcumin polymorphs
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Komal Upendra Pandey, Sameer Vishvanath Dalvi Understanding thermodynamic stability relationship among polymorphs of any active pharmaceutical ingredient (API) is a necessary step for drug formulation development. Knowledge of such relationship enables identification of a stable polymorphic form at the prevalent conditions. Curcumin, a pharmaceutically active ingredient found in herbal spice turmeric, exists in three polymorphic forms; a monoclinic form (Form 1) and two orthorhombic forms (Form 2 and Form 3). However, thermodynamic stability relationships among curcumin polymorphs have not been ascertained yet. This work therefore, was focused on understanding thermodynamic stability relationships among curcumin polymorphs. During purification of curcumin, the pressure applied for vacuum evaporation of organic solvent was found to significantly affect the polymorphic outcome. Form 1 was obtained at pressures ranging from 300 to 400 mbar whereas Form 2 was obtained at pressures ranging from 100 to 200 mbar. Form 3 was obtained by liquid antisolvent precipitation using ultrasound and Bovine Serum Albumin (BSA) as an additive. The obtained polymorphs were characterized by X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC) techniques. Relative stability of polymorphs was established by conducting solvent mediated transformation studies, thermal analysis through DSC and variable temperature X-ray diffraction studies (VT-XRD). It was observed that Form 2 and Form 3 irreversibly convert to Form 1 upon heating. Further, Form 2 and Form 3 convert to Form 1 in aqueous organic solutions at temperatures ranging from 0 °C to 50 °C. Thus, the curcumin polymorphs were found to be monotropically related to each other with the monoclinic form (Form 1) being the most stable form.Graphical abstractGraphical abstract for this article
       
  • The excellent photocatalytic activity of novel Cs3PW12O40/WO3 composite
           toward the degradation of rhodamine B
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Nemat Tahmasebi, Samira Mirzavand, Alireza Hakimyfard, Shahram Barzegar In this paper, a simple one-pot thermal decomposition method was successfully used to synthesize a novel Cs3PW12O40/WO3 composite for the first time. The synthesized composite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), FTIR, diffuse reflectance spectroscopy (DRS) and N2 adsorption-desorption techniques. The photocatalytic activity to degrade RhB molecules over Cs3PW12O40/WO3 composite was evaluated under xenon light irradiation. The results indicated the complete degradation of RhB molecules over Cs3PW12O40/WO3 composite after 30 min irradiation. However, the photocatalytic degradation of RhB over WO3 and Cs3PW12O40 after 80 min light irradiation are nearly 52%, and 68%, respectively. The enhanced photocatalytic activity of Cs3PW12O40/WO3 composite compared with WO3, and Cs3PW12O40 was ascribed to the strong interaction between WO3 and Cs3PW12O40, which effectively reduces the recombination of photogenerated electron-hole pairs. Based on experimental results, the possible mechanism of photocatalytic reactions on the Cs3PW12O40/WO3 composite photocatalyst was investigated, and the hydroxyl radical (OH) and superoxide radical (O2−) were determined as the main active species in the photocatalytic degradation of RhB over Cs3PW12O40/WO3 composite.Graphical abstractGraphical abstract for this article
       
  • Application of an Eulerian granular numerical model to an industrial scale
           pneumatic conveying pipeline
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): J. Heng, T.H. New, P.A. Wilson In this paper, an Eulerian granular numerical model is applied in the modelling of an industrial scale pneumatic-based cement conveying system. Steady-state simulation results are found to match pressure and outlet flowrate values with actual system data. By modifying the inlet pressure and material feed rate, data that predicts the performance of the conveying system have been obtained within the present study. Transient simulations have also been conducted and the results reveal intricate details of the cement flows along the pneumatic pipes and pipe bends. In particular, particle roping behaviour is observed to follow the sides of the wall before, during and after the pipe bends. A sloshing-like cement flow motion is also observed after the cement exits the bend. The concentration distribution of the cement particles is found not only to be partly due to gravitational effects but also the pneumatic pipe configuration. Lastly, close inspection of the secondary flows within the pneumatic pipe shows that their directional changes lead to a corresponding change in the particle roping direction, indicating that particle roping is closely associated with the secondary flow structures induced by the exact pipe configuration.Graphical abstractGraphical abstract for this article
       
  • Effect of the inlet angle on the performance of a cyclone separator using
           CFD-DEM
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Shuyan Wang, Haolong Li, Ruichen Wang, Xu Wang, Ruichao Tian, Qiji Sun Hydrodynamic characteristics in a cyclone separator are simulated by means of DEM-CFD. Reynolds stress turbulence model (RSM) is used to capture gas turbulence. By changing the inlet angle, the distributions of pressure drop, tangential and axial velocity of gas phase are obtained within the cyclone. Simulated results indicate that the flow pattern consists of two regions: loss-free vortex region and forced vortex region. The negative inlet angle brings about a larger pressure drop comparing to positive inlet angle. The separation efficiency and trajectory of particles from simulation are obtained. The effects of inlet angle and particle size on separation efficiency are quantified. The separation efficiency is increased with an increase of particle size, while the separation efficiency firstly increases and then declined as inlet angle changes from negative to positive. An agreement between the numerical simulation and experimental results has been achieved in a cyclone separator.Graphical abstractGraphical abstract for this article
       
  • Heat transfer enhancement in distribution transformers using
           TiO2 nanoparticles
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s): Bizhan Mehrvarz, Fatemeh Bahadori, Saeed Zolfaghari Moghaddam A transformer is an electrical device that transfers electrical energy between windings by electromagnetic induction while producing a considerable amount of heat in circuits. The heat produced in windings is removed by an appropriate heat transfer fluid such as liquid dielectrics. The cooling and insulating of a liquid dielectric depend on the properties of the oil filling the transformer. One of the approaches to enhance the thermal and dielectric properties of transformer oil is employing an appropriate nanoparticle in a transformer.In this paper, a three-phase distribution transformer is simulated three-dimensionally in order to study the heat transfer efficiency for pure oil (single phase) and nanofluid (TiO2 nanoparticles- transformer oil). For both models, the electromagnetic field in solid sections and heat transfer in fluid and solid sections of the transformer are simultaneously investigated. The simulation results show that the presence of TiO2 nanoparticles in the transformer oil increases the heat transfer coefficient, i.e. adding 1% (vol/vol) of TiO2 nanoparticles to the transformer oil increases the Nusselt number from 2.17 to 2.49, while the maximum temperature of transformer components decreases from 47.20 °C to 43.05 °C.Graphical abstractGraphical abstract for this article
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s):
       
  • Inside Front Cover (Aims & Scope, Editors)
    • Abstract: Publication date: February 2019Source: Advanced Powder Technology, Volume 30, Issue 2Author(s):
       
  • Morphological changes of calcium hexaboride powder synthesized from
           condensed boric acid-polyol product
    • Abstract: Publication date: Available online 12 January 2019Source: Advanced Powder TechnologyAuthor(s): Masaki Kakiage, Tomoyo Ohashi, Shuhei Shiomi, Hidehiko Kobayashi We previously reported a novel low-temperature synthesis method for calcium hexaboride (CaB6) powder via the transient formation of boron carbide (B4C) using a condensed boric acid (H3BO3)-polyol product. In this study, the effect of the type of polyol on the morphology of the CaB6 powder was investigated. Three types of polyol, glycerin, mannitol, and poly(vinyl alcohol) (PVA), were used for the preparation of condensed H3BO3-polyol products since the B4C particles prepared from these polyols exhibit different morphologies. CaB6 powder was successfully synthesized at a low temperature of 1400 °C regardless of the polyol used. The size of the obtained CaB6 particles varied with the polyol used, which reflected the size of the B4C particles prepared using the corresponding polyol. These results indicate that the morphology of the obtained CaB6 powder is derived from that of the transiently formed B4C particles.Graphical abstractGraphical abstract for this article
       
  • Preparation of monodisperse charged droplets via electrohydrodynamic
           device for the removal of fine dust particles smaller than 10 μm
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Kyusang Lee, Kyoung Il Lee, So Young Jeon, Seonmin Kim Electrohydrodynamic (EHD) device is utilized in various applications and could be useful for the suppression of particulate matter in ambient conditions. In this study, we focused on the ejection of charged droplets containing electrolytes in a microdripping mode and with high charge density. Several different electrolytes with different physical and electrical properties were tested for our EHD process in order to produce the charged droplets stably. Results from series images by high-speed camera represented that droplet size and frequency were dependent on the applied voltage and flow rate, and showed different behaviors in various EHD modes such as dripping, microdripping, mixed dripping, and unstable dripping. Consecutive experimental data for charge density showed that 15 wt% KCl solution was proper to obtain highly charged droplets with the size from 50 to 100 μm. For this solution, the suppression of the fine dust particle was tested for the removal of PM10, PM2.5, and PM1 at various applied voltages. The droplet formation in microdripping mode was effective for the removal of smaller dust particles and could be applicable for the air remediation in indoor or domestic environment.Graphical abstractGraphical abstract for this article
       
  • Synthesis of LiNi1−xCoxPO4/C nanocomposite cathode for lithium ion
           batteries by a combination of aerosol and powder technologies
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Ye Li, Izumi Taniguchi Pure LiNi1−xCoxPO4 (x = 0, 0.2, 0.5, 0.8, 1) was synthesized by spray pyrolysis followed by heat treatment. The X-ray diffraction (XRD) patterns of LiNi1−xCoxPO4 were indexed to olivine structure with a Pnma space group. The peak shift and variation of lattice parameters suggested that LiNi1−xCoxPO4 solid solution was formed. Moreover, LiNi1−xCoxPO4/C (x = 0, 0.2, 0.5, 0.8, 1) nanocomposites were successfully synthesized by a combination of spray pyrolysis and wet ball milling followed by heat treatment. The XRD patterns of all samples were indexed to olivine structure with a Pnma space group. From scanning electron microscopy images, the primary particle sizes of LiNi1−xCoxPO4/C nanocomposites were reduced to the range of approximately 50–100 nm. LiNi0.5Co0.5PO4/C cathode exhibited a higher first discharge capacity and cyclability than those of pure LiNi0.5Co0.5PO4. Cyclic voltammetry data demonstrated that reduction peaks of LiNi0.5Co0.5PO4/C cathode occur at 4.44 V and 4.71 V, which were ascribed to Co3+/Co2+ and Ni3+/Ni2+ reduction couples, respectively. Electrochemical impedance spectroscopy data revealed that the LiNi0.5Co0.5PO4/C cathode had a smaller charge transfer resistance, resulting in a faster redox reaction kinetics for the lithium insertion and extraction, due to reduced particle size and introduced conductive carbon.Graphical abstractGraphical abstract for this article
       
  • NaCl-template assisted preparation of porous carbon nanosheets started
           from lignin for efficient removal of tetracycline
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Atian Xie, Jiangdong Dai, Yu Chen, Na Liu, Wenna Ge, Ping Ma, Ruilong Zhang, Zhiping Zhou, Sujun Tian, Chunxiang Li, Yongsheng Yan We report here the preparation of lignin-based porous carbon nanosheets (LPCNS) using renewable lignin as a precursor and NaCl as a green template via a KOH activation for removing tetracycline (TC). Different techniques were employed to analyze the physicochemical properties of LPCNS. The LPCNS possessed high specific surface area of 3505 m2 g−1 and large pore volume of 2.0 cm3 g−1. Moreover, the batch adsorption tests using LPCNS showed that the equilibrium adsorption amount was 1613 mg g−1 for TC at 298 K. Additionally, the LPCNS exhibited fast kinetics performance and good regeneration performance. This advanced carbon adsorbent with nanosheet structure showed enhanced adsorption performance compared to bulk carbon. This environment-friendly and low-cost salt-template strategy for the fabrication of carbon nanosheets hold promise to design biomass-based carbon nanosheets or even other sheet materials.Graphical abstractGraphical abstract for this article
       
  • A facile synthesis of silicon carbide nanoparticles with high specific
           surface area by using corn cob
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Zibo An, Jun Xue, Hong Cao, Changhai Zhu, Han Wang Corn cob, which possesses low ash and high carbon contents, is a common waste material that accounts for a large amount of agricultural waste. This paper reports about a facile method to synthesize silicon carbide (SiC) nanoparticles with high specific surface area by using corn cob as a carbon source. The method is accomplished by carbothermal reduction at 1350 °C using corn cob as carbon source and silicon monoxide as silicon source. Fourier transform infrared (FT-IR) and Raman spectra results confirmed the formation of synthesized SiC particles. X-ray diffraction (XRD) results indicated the major phases of 3C-SiC. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that the SiC particle size is in the range of 40–100 nm and mainly composed of sphere-shaped nanoparticles. The Brunauer–Emmett–Teller (BET) specific surface area of samples is 80.25 m2/g. In addition, we proposed the formation mechanism of SiC nanoparticles with high specific surface area by adsorption and vapor–solid mechanism. This facile method for synthesizing SiC nanoparticles provides a new idea for high-value application of corn cobs and new raw material for the preparation of silicon carbide.Graphical abstractGraphical abstract for this article
       
  • Influence of surface roughness created by admixing smaller particles on
           improving discharge particle flowability of main particles
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Mikio Yoshida, Tatsuki Katayama, Ryota Kikuchi, Jun Oshitani, Kuniaki Gotoh, Atsuko Shimosaka, Yoshiyuki Shirakawa Particle flowability can be improved by admixing with particles smaller than the main particles. However, the mechanism by which this technique improves flowability is not yet fully understood. In this study, we focused on vibrating discharge particle flowability as one type of flowability and investigated the influence of the main particle roughness created by the adhesion of the admixed particles on improving the flowability. The diameters of the main and admixed particles (MPs and APs) were 41.4 or 60.8 μm and 8 or 104 nm, respectively. The main and admixed particles were mixed in various mass ratios, and the discharge particle flow rates of the mixed particles were measured. Scanning electron microscopy images were acquired from two different angles to determine the three-dimensional surface roughness using image analysis software. We then calculated the coating structure parameters from the obtained three-dimensional surface roughness. The observed trends for improving the vibrating discharge particle flowability were found to differ from those reported for compression particle flowability. Furthermore, the main particle roughness conditions that led to the greatest improvement involved the presence of several admixed particle agglomerations between the main particles.Graphical abstractGraphical abstract for this article
       
  • Experimental study of triboelectric charging of polyethylene powders:
           Effect of humidity, impact velocity and temperature
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Simon Jantač, Ladislav Konopka, Juraj Kosek The manufacturing and handling of polyethylene (PE) powders is associated with undesired charging, resulting in agglomeration of charged particles, wall sheeting and eventually leading to plugging of reactors/conveyors. In this work, we measured the triboelectric charging of PE powders using both sliding and shaking apparatuses in dependence on humidity, impact velocity of colliding particles and temperature of the colliding particles or of the wall. As expected, saturation charge of PE particles is reduced with increasing air humidity. However, in a more detailed study we observed that whenever we change the humidity, the saturation charge rapidly reaches the equilibrium value and no hysteresis in charging that might be caused, for example, by adsorption/desorption thermodynamics is observed. Saturation charge is believed to be independent of impact velocity; however, we show that the saturation charge is proportional to impact velocity in the system of PE particles of non-spherical shape. The charging is more pronounced as the temperature of PE particles increases, however, it is unchanged if only the metal wall in contact with the particles is heated. That is a different trend than observed for spherical metal particles (Greason, 2000).Graphical abstractGraphical abstract for this article
       
  • Two-dimensional CFD simulation of chemical reactions in tapered-in and
           tapered-out fluidized bed reactors
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Hossein Askaripour, Asghar Molaei Dehkordi This article presents a simulation study of tapered-in and tapered-out fluidized bed reactors to investigate the influences of apex angle on the fractional conversion and the pressure drop of the fluidized beds in the presence of two types of chemical reaction with gas volume increase and reduction. The 2D behavior of tapered-in and -out fluidized beds was also compared with a columnar one from fractional conversion and bed pressure drop point of views. To validate the simulation results, the numerical predictions for the expansion ratio and the pressure drop of a tapered fluidized bed were compared with experimental data and good agreement was observed. The obtained simulation results clearly indicate that an apt apex angle exists in tapered-in reactors in which the fractional conversion reaches a maximum value; while the variations of the apex angle slightly affect the fractional conversion in tapered-out fluidized beds. Increasing the residence time of the gas phase in the upper section of tapered-in beds has positive influences on the fractional conversion, while a further decrease in the gas phase velocity in the tapered-in reactors has a negative effect on the fractional conversion. Moreover, higher bed pressure drop was observed in tapered-in reactors than that in the columnar and tapered-out ones.Graphical abstractGraphical abstract for this article
       
  • The fabrication of floating Fe/N co-doped titania/diatomite granule
           catalyst with enhanced photocatalytic efficiency under visible light
           irradiation
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Yan Chen, Qiong Wu, Li Liu, Jun Wang, Youtao Song Powdery photocatalyst has long been studied, yet its several disadvantages such as light-harvesting and recyclability in suspension system are the bottlenecks for practical application. The recent report on floating photocatalyst provided an alternative method to solve the above problem. In this work, TiO2 nanoparticles were co-doped by iron and nitrogen, and then dispersed onto natural porous mineral diatomite via sol-gel method. The composite powder was granulated to produce floating granule catalyst (Fe/N co-doped TiO2/diatomite hybrid granule), denoted as FN-TDHG. Its various physicochemical properties such as light absorbance, crystallinity, surface condition as well as morphology were systematically analyzed. The synergy between Fe and N dopants, as well as diatomite and TiO2 were studied. The photoactivity of FN-TDHG was investigated via the degradation towards tetracycline (TC) solution under visible light irradiation, and then the optimal co-doping amount and granule dosage were determined. The optimal granule catalyst presented its removal rate of TC as 96.5% within 150 min. Moreover, floating FN-TDHG could simply be filtrated from the surface of water matrix, and presented good reusability after 5 repetitions. This photocatalytic granule is hopefully considered suitable to be applied in environmental remediation.Graphical abstractGraphical abstract for this article
       
  • Porous graphitic carbon nitride with lamellar structure: Facile synthesis
           via in-site supramolecular self-assembly in alkaline solutions and
           superior photocatalytic activity
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Ling-Xi Zhang, Wei-Qing Huang, Yuan-Yuan Li, Gui-Fang Huang The development of highly active photocatalysts is the primary goal in the field of photocatalysis. We herein first develop a facile and scale up approach to synthesize porous polymeric graphitic carbon nitride (g-C3N4) with lamellar structure through thermal polycondensation of supramolecular aggregates. The feature of this approach lies in the directed in-situ self-assembly of cyanuric acid molecules, converted from the hydrolysis of melamine in NaOH solution, with the residual melamine molecules to form supramolecular aggregates, which lead to the formation of porous g-C3N4 with lamellar structure. The synthesized lamellar g-C3N4 exhibit superior photocatalytic activity as demonstrated by the complete degradation of methylene blue (MB) under one hour’s visible light irradiation, as well as excellent stability with high activity retained after four runs of MB degradation testing. The enhancement in photocatalytic performance can be attributed to its unique lamellar structure with high surface area, narrow bandgap, and efficient separation of photogenerated electron-hole pairs. This work shows that the alkaline solutions can be used as the molecular self-assembly medium and opens a new avenue towards designing highly active g-C3N4-based photocatalyts for energy and environmental applications.Graphical abstractGraphical abstract for this article
       
  • Enhanced visible light photocatalytic activity in AgI/BiOCOOH composite
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Mengjian Hao, Tiantian Yi, Yongfan Cao, Yinmin Song, Zhenzhu Cao, Weiyan He, Yanfang Gao, Jinrong Liu AgI/BiOCOOH composite photocatalysts have been synthesized via a simple deposition-precipitation method. The crystal structure, microstructure, element valance, light and electrical properties of as prepared samples were characterized by XRD, SEM, TEM, XPS, UV–Vis DRS, PL, EIS and photocurrent response. The loading of AgI nanoparticles endowed BiOCOOH with good visible light absorption and photocatalytic activity for degrading rhodamine B. The composition with Ag:Bi = 1:1 exhibited the best photocatalytic activity. The enhanced photocatalytic performance could be mainly attributed to the effective separation of the photogenerated carriers at the heterojunction. O2− and h+ were suggested as the main reactive species in the photocatalytic reaction. In addition, the photocatalysts showed excellent stability over multiple reaction cycles.Graphical abstractGraphical abstract for this article
       
  • A pilot level approach to remove anionic species from industrial effluents
           using a novel carbonate-steam pyrolysed activated charcoal system
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Harsha Mahadevan, A.R. Nayana, V. Viswadas, Sibin Antony, Vinu V. Dev, Sandhya Sudhakaran, Helan Priya Pious, K. Anoop Krishnan In our laboratory, we synthesized a novel surface tailored activated charcoal in removing nitrite species from fertilizer industrial effluents. A customized high temperature carbonate-steam activation technique was adopted to develop the sodium carbonate impregnated activated charcoal (SCIAC). The surface properties of the material were determined using SEM, TG and X-RD techniques. Batch adsorption experiments were performed for optimizing various conditions such as solution pH, contact time, temperature and adsorbent dose for maximizing the nitrite adsorption onto SCIAC. Considerably, a very high nitrite adsorption percentage of 83.8 was obtained for an initial nitrite concentration of 5.0 mg/L at pH 3.0. Among the various equilibrium and kinetic models, Freundlich and pseudo-second-order expressions, respectively, were well enough to explain the adsorption processes. In general, it may conclude that the change in surface characteristics of the adsorbent material after the pyrolysis process is highly favorable for effective removal of nitrite ions from aqueous systems. Adsorption capacity of SCIAC was 27.03 mg/g and studies revealed that the material was feasible in removing nitrite from industrial effluents.Graphical abstractGraphical abstract for this article
       
  • Simulation of the pressure drop across granulated mixtures using a coupled
           DEM – CFD model
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): A.M. Nyembwe, R.D. Cromarty, A.M. Garbers-Craig The sinter process converts mixtures of iron ore, iron ore fines and fluxes into a fused aggregate (sinter) that is used as burden material in the blast furnace. The rate of this process is predicted by measuring the pressure drop across the green granulated mixture before ignition. A lower pressure drop corresponds with a higher permeability resulting in a higher sinter rate. The addition of fine material, such as concentrate or concentrate agglomerated into micropellets, to the sinter mixture affects the pressure drop. This study numerically predicts the pressure drop over several granulated mixtures in order to reduce the number of experimental measurements. The pressure drop was studied both experimentally using a pot grate and by coupled DEM (Discrete Element Method) – CFD (Computational Fluid Dynamics) simulations. The validation of the model was performed by comparing the measured and numerical values of the pressure drop across glass beads 3 and 6 mm in diameter respectively. The simulation of the pressure drop was extended to granulated mixtures that contain 0–40% concentrate or micropellets. DEM was also used to numerically simulate iron ore granules and relate their mechanical behaviour to particle size distribution, shape, friction coefficient, Young’s modulus and adhesion force.Graphical abstractGraphical abstract for this article
       
  • An appraisal of the energy-size reduction relationships for mill scale-up
           design
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): V.K. Gupta In this paper, several well-known energy-size reduction relationships have been analyzed using Kapur’s similarity solution to the integro-differential equation of batch grinding. It has been shown that: (i) relationships proposed in terms of the energy actually utilized for breakage of particles, E, cannot be used to develop a practical energy-size reduction relationship as E is neither measurable nor it is found to be proportional to the measurable net energy input, En, (ii) the exponent of the characteristic particle size, x¯, in the relationship between En and x¯ is same as the exponent of particle size in the expression for the specific breakage rate function, α, which is not a function of x¯ in the case of ball mills, (iii) α values of 0, 0.5 and 1 cannot be associated with the laws of Kick, Bond and Rittinger, respectively. Based on the results of this analysis, the empirical scale-up models proposed by Bond and Morrell have been modified by replacing the exponents of 80% passing sizes by α. Further investigations have been recommended for resolution of large differences in the energy estimates obtained from these models for materials characterized by grindabilty values less than 1.0 and greater than 3.0 g/rev.Graphical abstractGraphical abstract for this article
       
  • Effects of linearly heated left wall on natural convection within a
           superposed cavity filled with composite nanofluid-porous layers
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Basil Mahdi Al-Srayyih, Shian Gao, Salam Hadi Hussain The effect of a linearly heated left sidewall on natural convection flows in a cavity filled with nanofluid-superposed porous layers is investigated numerically using the Galerkin finite element method. Two cases, which use the vertical and horizontal directions for the porous–nanofluid layers, are considered to investigate the natural convection in the flow inside a square enclosure. In both cases, the left wall is linearly heated, whereas the right wall is isothermally cooled. The horizontal walls are assumed to be thermally insulated. The Darcy–Brinkmann model is used to solve the governing equations in the porous layer. The results show that the nanofluid produces more enhancement of heat transfer compared to the base fluid. Increasing the Rayleigh number (Ra) values caused the intensity of the streamlines in case 2 to be stronger than that in case 1. Lower values of the thermal conductivity ratio (Kr) imply greater heat transfer enhancement than for the high thermal conductivity ratios. At the low values of the thermal conductivity ratio (Kr
       
  • Development of Venturi negative-pressure secondary dedust device and
           application of local spray closure technique
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Biao Sun, Weimin Cheng, Jiayuan Wang, Hao Wang, Youying Ma In order to enhance the spray for dust suppression performance in a fully-mechanized mining face, based on orthogonal test, comparison test, numerical simulation and field application, the Venturi negative-pressure secondary dedust device was developed. Meanwhile, the local spray closure technique was proposed, which can not only effectively prevent the escape of coal dust from entering the footway space, but also remove coal dust around the respiratory zone from the footway space successfully. The results demonstrated that, under spray pressure of 6 MPa, the Sauter mean droplet size, negative pressure suction flow rate and effective spray distance of the novel dedust device with a throat-to-nozzle distance and throat diameter of 20 mm and 65 mm were 47.37 µm, 11.21 m3/min and 5.4 m respectively. Moreover, the novel dedust device produced droplets to a smaller scale than a single-nozzle. Additionally, the negative pressure and airflow velocity in the negative pressure suction inlet of novel dedust device were within the range from −0.97 Pa to −541.04 Pa and from 2.96 m/s to 27.29 m/s respectively. Finally, compared with the original dust suppression measures, the local spray closure technique can enhance the removal ratio of respiratory dust by an average of 44.3%.Graphical abstractGraphical abstract for this article
       
  • A new approach for synthesis of ZnO nanorod flowerets and subsequent pure
           free-standing ZnO nanorods
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): B. Bhushan, B.S. Murty, K. Mondal Present work reports the synthesis of ZnO flowerets consisting of nanorod petals of ZnO having a mean aspect ratio ∼9, supported on micron sized Ni-enriched particles of size in the range of ∼1–4 μm and also free-standing pure ZnO nanorods from mechanically alloyed Ni-Zn powder particles via selective leaching in NaOH solution. Optimization of the composition of the initial alloy powder, the concentration of NaOH and time of exposure in the solution was carried out to get to the ZnO flowerets with an increment in the surface area of the order of 400%. The mechanism and reaction chemistry of ZnO nanorods formation and growth were explained based on the evidence of various characterization techniques including inductive coupled plasma mass spectroscopy (ICP-MS) and electrochemical measurements. Free-standing pure ZnO nanorods were also synthesized by ultrasonically breaking the rod petals of ZnO from the base of the flowerets. Free-standing ZnO nanorods have a mean aspect ratio of 8.5 ± 4, where the length and average diameter are ∼356 ± 64 nm and 42 ± 16 nm, respectively, and the specific surface area of 12.5 m2 g−1 with an increment of ∼650% as compared to the mechanically alloyed powder particle.Graphical abstractGraphical abstract for this article
       
  • Synthesis of Ag+/CaTiO3:Pr3+ with luminescence and antibacterial
           properties
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Zhu Liu, Kehui Qiu, Qinxue Tang, Yangting Wu, Junlan Wang In the study, CaTiO3:Pr3+ and Ag+ nano-particles-coated CaTiO3:Pr3+ red-emitting phosphors were synthesized by the citric acid sol combustion method. The photoluminescence properties and microstructures were investigated by photoluminescence spectroscopy, X-ray powder diffraction, and scanning electron microscopy. All samples showed the consistent orthorhombic crystal structure with standard CaTiO3. The photoluminescence measurements indicated that the all the experimental samples synthesized at 800 °C could be excited by 323 nm ultraviolent light and the emission intensity reached its maximum value at 619 nm. The Ag+ coating on the grain surface of CaTiO3:Pr3+ red-emitting phosphors had the antibacterial properties and the sample synthesized at 800 °C had optimal antibacterial properties. Moreover, the antibacterial property increased with the increase in the addition of Ag+ coating. The Ag+-coated CaTiO3:Pr3+ red-emitting phosphor excited by ultraviolent radiation is a promising red phosphor for manufacturing white-light-emitting diodes as well as antibacterial materials. This multi-functional material can be applied in many areas such as medical devices.Graphical abstract(a) X-ray diffraction patterns of the 1%Ag+/CaTiO3:0.2%Pr3+ samples obtained at different synthesis temperatures, (b) emission spectra of the 1%Ag+/CaTiO3:0.2%Pr3+ samples prepared at different temperatures, (c) Relative diameters of the inhibition zone for different contents of xAg+/CaTiO3:0.2%Pr3+ synthesized at 800 °C: A: x = 0.1, B: x = 0.2, C: x = 0.4, D: x = 0.6, E: x = 0.8, F: x = 1.0 and (d) Images of the inhibition zone photograph for different contents of xAg+/CaTiO3:0.2%Pr3+ synthesized at 800 °C: A: x = 0.1, B: x = 0.2, C: x = 0.4, D: x = 0.6, E: x = 0.8, F: x = 1.0.Graphical abstract for this article
       
  • pH controlled synthesis of porous graphene sphere and application to
           supercapacitors
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Taehyeong Ha, Sun Kyung Kim, Jeong-Woo Choi, Hankwon Chang, Hee Dong Jang Graphene (GR) has excellent physical and chemical properties, making it promising for application in supercapacitors. In this study, we report the synthesis of spherical GR (SGR) composed of tens of GR sheets and its application in supercapacitors. Graphene oxide (GO) was first reduced in the liquid phase by using L-ascorbic acid (L-AA), an environmentally friendly reducing agent, and then SGR was prepared using the reduced GO colloid by aerosol spray drying. The reduction of GO in the liquid phase was completed in 1 h. The SGR fabricated by the aerosol process ranged from 2 to 4 μm in diameter. The as-prepared SGR fabricated from GO at pH 2 showed a densely packed spherical morphology and porous structure with a specific surface area of 150 m2/g. The SGR fabricated from the GO colloid at pH 10 showed an improved specific surface area (216 m2/g) and a higher specific capacitance (182 F/g) than the SGR fabricated at pH 2. Considering the environmentally friendly process, the as-prepared SGR is a highly promising material for supercapacitors.Graphical abstractGraphical abstract for this article
       
  • Scalable microwave-assisted continuous flow synthesis of CuO nanoparticles
           and their thermal conductivity applications as nanofluids
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Arun V. Nikam, Arun H. Dadwal We have demonstrated the novel and scalable synthesis of CuO nanoparticles by an integration of microwave and flow synthesis. The shape and size of CuO nanoparticles were tuned by changing the concentration of copper precursor. The production rate of CuO nanoparticles was found to be 5 g/h with 70% conversion of copper acetate into the CuO nanoparticles. The thermal conductivity of CuO nanofluid prepared in ethylene glycol showed linear enhancement with increase in the volume content of CuO nanoparticles produced in batch and flow reactors.Graphical abstractGraphical abstract for this article
       
  • Direct synthesis of highly crystalline single-phase hexagonal tungsten
           oxide nanorods by spray pyrolysis
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Shuhei Nakakura, Aditya Farhan Arif, Febrigia Ghana Rinaldi, Tomoyuki Hirano, Eishi Tanabe, Ratna Balgis, Takashi Ogi The metastable state hexagonal-tungsten oxide (h-WO3) has been attracting attention over the past decade because of its high reactivity that arises from the hexagonal channels in its crystal structure. Simplification of the process used to synthesize h-WO3 is an important step to facilitate the industrial applications of this material. In this study, we addressed this challenge by developing a spray pyrolysis process to synthesize highly crystalline h-WO3. The ratio of the monoclinic to the hexagonal phase was controlled by adjusting the segregation time. Single-phase h-WO3 nanorods were synthesized using a carrier gas flow rate of 1 L/min, which was equivalent to a segregation time of 18.4 s. The ability of the h-WO3 nanorods to adsorb nitrogen and carbon dioxide was evaluated to confirm the presence of hexagonal channels in the crystal structure.Graphical abstractGraphical abstract for this article
       
  • Comparison of deoxidation capability on the specific surface area of
           irregular titanium powder using calcium reductant
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Jung-Min Oh, Chon-Il Hong, Jae-Won Lim Irregular titanium powders of various particle size in the range 60–250 μm were deoxidized using calcium as the reductant, and the effect of specific surface area on the process was investigated. At 1273 K, the oxygen concentration was reduced from 0.2840 wt% to 0.0950 wt%, from 0.2050 wt% to 0.0825 wt%, and from 0.1700 wt% to 0.0825 wt% in titanium powders with average particle sizes of 60 μm, 125 μm, and 250 μm, respectively, and the corresponding removal degree of oxygen (RDO) for these specimens was determined to be 66.5%, 59.7%, and 51.4%; that is, the RDO was inversely proportional to the average particle size of the irregular titanium powder. It was confirmed that the specific surface area of the titanium powder available for reaction with calcium, was the critical factor in the deoxidation of titanium powder using calcium as reductant.Graphical abstractGraphical abstract for this article
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s):
       
  • Inside Front Cover (Aims & Scope, Editors)
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s):
       
  • 2018 Reviewer Appreciation
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s):
       
  • Corrigendum to “Bio-mechanochemical synthesis of silver nanoparticles
           with antibacterial activity” [Adv. Powder Technol. 28(12) (2017)
           3307–3312]
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Matej Baláž, Nina Daneu, Ľudmila Balážová, Erika Dutková, Ľudmila Tkáčiková, Jaroslav Briančin, Mária Vargová, Miriama Balážová, Anna Zorkovská, Peter Baláž
       
  • Synthesis of polystyrene@silica particles through soap-free emulsion
           polymerization and sol-gel reaction on polymer surfaces
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Tetsuya Yamamoto, Yuya Takahashi Polystyrene@silica particles were produced through soap-free emulsion polymerization (SFEP) of styrene and N-vinylacetamide (NVA) via the sol-gel reactions of tetraethyl orthosilicate (TEOS) on polymer particle surfaces. Different amounts of NVA were used to prepare polystyrene particles using the SFEP process. The particles covered with poly-NVA then underwent the Stöber process to form an outer silica shell. NVA was found to stabilize the polymer colloids and improve their stability by steric effects, even after the positive charge on the polymer surface was partially neutralized by the electrostatically adsorbed TEOS, which tends to induce particle aggregation. Further, the –NH functional groups on NVA catalyzed the hydrolysis of TEOS in the sol-gel reaction to form silica. Consequently, small, monodisperse, and stable core-shell particles were formed despite having a low zeta potential.Graphical abstractGraphical abstract for this article
       
  • Influence of CaCO3 pore-forming agent on porosity and thermal conductivity
           of cellulose acetate materials prepared by non-solvent induced phase
           separation
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): W. Suthabanditpong, C. Takai, H. Razavi-Khosroshahi, Y. Okada, M.S. El-Salmawy, M. Fuji Thermal insulation materials with a low thermal conductivity are indeed demanded because they play the main role in the enhancement of energy conservation in various industries, especially lightweight constructive materials. Therefore, tubular cellulose acetate (CA) materials were firstly prepared by non-solvent induced phase separation (NIPS). In the NIPS process, the concentration of CA was varied in a range of 20–40 wt%. Also, the temperature of water used as a non-solvent was studied from 5 °C up to 50 °C. According to the FE-SEM results, the 30 wt% CA solution at 20 °C provides tubular CA materials with a higher porous structure than an original CA material but the pore size is quite larger than the mean free path of air leading to achieve a material with high thermal conductivity. To overwhelmed such a problem, the calcium carbonate (CaCO3) was used to be pore forming agents in order to decrease pore size of prepared CA sheet materials. The amount of CaCO3 particles in the CA sheet materials was varied as 50 and 60 wt% to investigate its effect on porosity and thermal conductivity of the prepared materials. As the results, the CA sheet materials prepared using NIPS process and after removing 60 vol% CaCO3 have an enlargement of pores with a size lower than the mean free path of air. They exhibit high porous materials leading to the reduction of their thermal conductivity, which has the lowest value about 0.043 W/mK. Consequently, the CA materials are potentially applied for constructive materials in order to reduce energy consumption in buildings.Graphical abstractGraphical abstract for this article
       
  • Synthesis of Na-X zeolite from low aluminum coal fly ash: Characterization
           and high efficient As(V) removal
    • Abstract: Publication date: January 2019Source: Advanced Powder Technology, Volume 30, Issue 1Author(s): Ting Yang, Caiyun Han, Hang Liu, Liu Yang, Dekun Liu, Jie Tang, Yongming Luo Na-X zeolite was successfully prepared from low aluminum coal fly ash (LACFA) via fusion-hydrothermal treatment. The influence of various synthesis parameters was investigated, including aluminum additives (AlCl3·6H2O, Al(NO3)3·9H2O, AlF3·3H2O and NaAlO2), dosages of NaAlO2, weight ratio of LACFA/NaOH, crystallization temperature and time. The results indicated that the addition of Al species played a key role in the synthesis process of purity Na-X zeolite, and the corresponding relative crystallinity of the obtained samples was in the order of Na-X zeolite(Al) ≫ Na-X zeolite(Cl) > Na-X zeolite(N) > Na-X zeolite(F) (Here, “Al”, “Cl”, “N” and “F” represent NaAlO2, AlCl3·6H2O, Al(NO3)3·9H2O and AlF3·3H2O, respectively). And the optimal operating conditions were: the weight ratio of LACFA/NaOH = 0.83, short crystallization time 360 min, low crystallization temperature 90 °C and 0.038 mol NaAlO2. Additionally, X-ray fluorescence (XRF), X-ray powder diffraction (XRD), Fourier Transforms Infrared (FT-IR) and Scanning Electron Microscopy (SEM) were employed to determine the resultant samples. Based on the results of As(V) adsorption experiment, the experimental data was suitable fitted by Freundlich adsorption isotherm model, and the theoretical maximum adsorption capacity was 27.79 mg/g at pH = 2.14. The kinetics studies suggested that “surface reaction” was the rate-determining step of adsorption process, and the thermodynamics studies indicated that the adsorption process was spontaneous and endothermic. These results deemed that the LACFA was suitable for preparing Na-X zeolite(Al), and the obtained Na-X zeolite(Al) was served as a promising adsorbent to remove As(V) from acid wastewater.Graphical abstractAfter the dissolution of FA (SiO2 and Al2O3) and the addition of NaAlO2, the silicate and aluminate ions will accelerate the formation of aluminosilicate gel. Then the Na-X zeolite which owned the TO4 (T = Si or Al) structure will be formed via hydrothermal treatment.Graphical abstract for this article
       
  • Triaxial behavior of granular material under complex loading path by a new
           numerical true triaxial engine
    • Abstract: Publication date: Available online 6 January 2019Source: Advanced Powder TechnologyAuthor(s): Xiaoliang Wang, Zhen Zhang, Jiachun Li A new numerical true triaxial engine based on discrete element method accounting for rolling resistance contact is developed. By this engine, we have simulated mechanical behavior of granular materials under complex stress loading path in this study. Stress-strain responses of a kind of typical granular sand under several stress loading path in meridian and deviatoric stress space are provided. The results show that the three dimensional effects like the intermediate principal stress play an important role in the modeling processes. Theoretical analysis in strength characteristic implies the strength criteria with three parameters such as unified strength criterion and van Eekelen strength criterion are capable of describing cohesionless granular material behaviors in three dimensional stress states. Moreover, the case study for Chende sand further demonstrates the numerical true triaxial engine, is a potential tool. As compared to conventional triaxial compression test, this new developed apparatus could be widely used to “measure” elastic-plastic behavior in three dimensional stress space for finite element analysis in geotechnical problems.Graphical abstractStrength Envelopes from DEM, UST, VE, MC and DP: Prediction and Comparison.Graphical abstract for this article
       
  • Vacuum-assisted synthesis of tiny Au nanoparticles entrapped into
           mesoporous carbon matrix with superior catalytic activity for
           4-nitrophenol reduction
    • Abstract: Publication date: Available online 6 January 2019Source: Advanced Powder TechnologyAuthor(s): Cheng Gong, Ziwei Zhou, Haijun Zhou, Rui Liu In this work, we report a vacuum-assisted approach to synthesize tiny Au nanopartciles (Au NPs) entrapped into mesoporous carbon matrix (denoted as Au@MC). The tiny Au NPs are stably entrapped within the mesoporous structure and possess a small particle size (∼2.64 nm). The composite also exhibits a high specific surface area (∼421 m2 g−1), which may provide convenient transportation and diffusion for substrate molecules. Thus, Au@MC exhibits superior catalytic activity and reusability for 4-nitropheno (4-NP) reduction. The vacuum-assisted synthesis with unique nanostructure is expected to be applied in the preparation of other catalysts.Graphical abstractGraphical abstract for this article
       
  • Comparative study on sintering behavior of Al86Ni6Y4.5Co2La1.5
           mechanically alloyed amorphous powder and melt-spun ribbon
    • Abstract: Publication date: Available online 3 January 2019Source: Advanced Powder TechnologyAuthor(s): A. Sahu, R.S. Maurya, T. Laha In this research work, the sintering characteristics of Al86Ni6Y4.5Co2La1.5 mechanically alloyed amorphous powders and milled melt spun ribbon have been compared. Mechanically alloyed amorphous powders were synthesized via 200 h high energy ball milling. Melt spun ribbons were synthesized by single roller melt spinning technique and grounded to powder form by ball milling. Mechanically induced partial crystallization occurred in the ribbons during milling. Significantly higher amount of contaminations such as carbon, oxygen and iron were observed in the mechanically alloyed amorphous powders compared to the milled ribbons. Both powders were consolidated via spark plasma sintering. Superior particle bonding was found in the sample consolidated from milled ribbon, ascribed to the lower amount of contamination that could not effectively restrict the viscous flow and diffusion of atoms. Various complex crystalline phases evolved in the sample consolidated from milled ribbon particles due to the presence of crystalline phases in the powders which acted as nucleation sites, whereas the amorphous phase was mostly retained in its counterpart. Vickers microhardness of the consolidated alloys from milled ribbon and mechanically alloyed amorphous powders were 3.60 ± 0.13 GPa and 2.53 ± 0.09 GPa respectively. The higher hardness in the former case was attributed to the superior particle bonding and distribution of hard intermetallic phases in the amorphous matrix.Graphical abstractGraphical abstract for this article
       
  • The roles of magnesium in the mineral metabolism of biological apatite for
           the treatment of arthritis inspired by the deer antler
    • Abstract: Publication date: Available online 2 January 2019Source: Advanced Powder TechnologyAuthor(s): Xu Liu, Haishan Shi, Tao Yu, Changren Zhou Nowadays, the treatment of osteoarthritis (OA), a highly prevalent joint disorder, remains a medical challenge because of the lack of understanding of its pathogenesis. In this work, we developed an alternative strategy of OA treatment using magnesium-based materials as potential therapeutic agent towards subchondral bone remodeling. We selected deer antlers as the animal model where calcification behaviors could provide interesting references for the rapid and reproducible endochondral bone growth. Extremely high content of Mg was detected in the antler, which was able to affect the evolutions of biological apatite. Herein, octacalcium phosphate (OCP) and amorphous calcium phosphate (ACP), which are critically involved in the calcification process, were respectively synthesized under the Mg-containing conditions to understand the role of Mg in the evolution of biological apatite. Results showed that the substitution of Mg2+ at lower contents stabilized OCP and ACP, while higher contents of Mg inhibited the formation of both phases. The size of both calcium phosphates was also altered significantly by the addition of Mg. The results of cell culture indicated that excess Mg notably accelerated the secretion of extracellular matrix and inhibited the mineralization of chondrocyte matrix. Hence, utilization of Mg-based materials in subchondral bone was supposed to provide a potential therapeutic approach to treat the OA by inhibiting subchondral of ossification process.Graphical abstractOsteoarthritis is a highly prevalent and debilitating joint disorder. In this study, Mg as a potential anti-activation agent for repair of OA cartilage was studied. Inspired by the calcification behavior of deer antler, we found that Mg could stabilize the crystal structure of ACP and OCP at a specific concentration and inhibit that at a relatively high content. In consequence, magnesium in subchondral bone was supposed to delay the ossification process of osteoarthritis, and inhibition of ossification process could be a potential therapeutic approach to treating this disease.Graphical abstract for this article
       
  • Novel polysiloxane microspheres: Preparation and application in
           chlorinated butyl rubber (CIIR) damping composites
    • Abstract: Publication date: Available online 29 December 2018Source: Advanced Powder TechnologyAuthor(s): Sheng Zeyuan, Wang Jincheng, Yang Siyuang, Song Shiqiang Polysiloxane microspheres (PSM) were prepared from a linear siloxane polymer by a simple emulsion procedure. Then, novel modified polysiloxane microspheres (MPSM) containing Si-OH groups were generated by introducing of organic hindered phenol groups, which were exploited for the functionalization of the microspheres with hydroxyl groups. The structure and properties of PSM and MPSM were revealed by various analysis, such as FTIR, XRD, SEM, TG, BET, etc. These polysiloxane microspheres, PSM and MPSM, were then used as rubber reinforcing fillers. The PSM and MPSM offered obvious effects on the properties of chlorinated butyl rubber (CIIR) and can improve its damping performance in a different agree. In addition, thermal stability, thermal conductivity, tensile properties, and toughing and damping mechanisms of the rubber composites were also investigated.Graphical abstractGraphical abstract for this article
       
  • Modern synthesis strategies for hierarchical zeolites: Bottom-up versus
           top-down strategies
    • Abstract: Publication date: Available online 28 December 2018Source: Advanced Powder TechnologyAuthor(s): Xicheng Jia, Wasim Khan, Zhijie Wu, Jungkyu Choi, Alex C.K. Yip Zeolites are well known for their ordered microporous networks, good hydrothermal stability, large surface area, high acidity and selectivity. These excellent properties make zeolites extremely useful for petrochemical processes and refining. However, the presence of only microporous channels also restricts the diffusion of reactants and products into and out of the microporous networks, especially limiting zeolite applications involving bulky molecules. The importance of developing hierarchical zeolites has attracted great attention in recent years due to the prospect of increased accessibility for bulky molecules. Introducing additional mesoporosity, and even macroporosity, into conventional zeolites produces a combination of three different size scales of porosity. It expands the original zeolite hierarchical structure and greatly enhances the mass transport of molecules while maintaining the intrinsic size, shape and transition state selectivity of zeolite. The promising applications of this new zeolite architecture have prompted a multitude of efforts to develop a variety of different synthesis strategies. In this review, we summarized and evaluated the modern synthesis strategies (bottom-up and top-down) for introducing additional meso/macroporosity into microporous zeolites. The advantages and limitations of these different strategies were discussed in detail.Graphical abstractGraphical abstract for this article
       
  • Removal of heavy metal lead(II) using nanoscale zero-valent iron with
           different preservation methods
    • Abstract: Publication date: Available online 19 December 2018Source: Advanced Powder TechnologyAuthor(s): Zhang Dongsheng, Gao Wenqiang, Chang Guozhang, Luo Shuai, Jiao Weizhou, Liu Youzhi In this study, different nanoscale zero-valent irons (nZVI) were prepared in order to improve their stability and reactivity to heavy metal lead (Pb (II)). The composition, particle size and morphology of obtained nZVI were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscope (SEM). The effects of nZVI dosage, pH, initial Pb (II) concentration and reaction time on the removal efficacy of Pb (II) were investigated. The results show that undried nZVI has more active sites due to its weaker oxidation, and thus the removal efficiency of Pb(II) by undried nZVI was higher than that by dried nZVI. As a result, the same removal efficiency could be achieved with the use of less undried nZVI for the identical concentration of Pb(II). Furthermore, the experimental procedure could be apparently simplified, which eliminates the steps of washing, separation and dehydration compared with the traditional preparation method. The experimental data could be well fitted by the Langmuir adsorption isotherm model, and the maximum adsorption capacity of dried and undried nZVI is 671.14 and 807.23 mg·g−1 at pH 6, respectively. The experimental data followed the pseudo second-order kinetic model with a kinetic constant of 7.65 × 10−4 and 1.39 × 10−3 for undried and dried nZVI, respectively. In conclusion, undried nZVI had high adsorption capacity and adsorption rate for Pb(II) in the solution.Graphical abstractGraphical abstract for this article
       
  • Exceptional photocatalytic activity for g-C3N4 activated by H2O2 and
           integrated with Bi2S3 and Fe3O4 nanoparticles for removal of organic and
           inorganic pollutants
    • Abstract: Publication date: Available online 19 December 2018Source: Advanced Powder TechnologyAuthor(s): Mitra Mousavi, Aziz Habibi-Yangjeh, Davod Seifzadeh, Kazuya Nakata, S. Vadivel Herein, hydrogen peroxide activated graphitic carbon nitride (agCN) was combined with Fe3O4 and Bi2S3 to fabricate agCN/Fe3O4/Bi2S3 nanocomposites via facile refluxing method, as visible-light-induced photocatalysts for photodegradations of anionic and cationic dyes such as MO, RhB, MB, and photoreduction of Cr(VI). The fabricated samples were explored by XRD, EDX, XPS, TGA, SEM, TEM, HRTEM, VSM, PL, FT-IR, BET, and UV-vis DRS. Photocatalytic activity of the nanocomposite with 20% of Bi2S3 was 16.6, 40.4, 19.5, and 12.5 times more than that of the pristine gCN in removal of RhB, MB, MO, and Cr(VI), respectively. A plausible photocatalytic mechanism on the agCN/Fe3O4/Bi2S3 nanocomposites was proposed by construction of n-n heterojunction between gCN and Bi2S3. Also, stability of the magnetic hybrid was characterized through cyclic photocatalytic tests.Graphical abstractGraphical abstract for this article
       
  • A switchable hydrophilicity solvent mediated process to prepare fine
           silica aerogel powder as an excellent flatting agent
    • Abstract: Publication date: Available online 17 December 2018Source: Advanced Powder TechnologyAuthor(s): Bernard Baffour Asare Bediako, Peng Zhou, Benoit Rugabirwa, Qunhong Liu, Yuzhong Su, Hongtao Wang, Jun Li This work demonstrates a facile two-step method to produce fine silica aerogel powder from silica hydrogel by using N,N-dimethylcyclohexylamine (CyNMe2) as a CO2-mediated switchable hydrophilicity solvent. The solvent can almost be totally recycled. More than 70% pore water from silica hydrogel was removed by a quick CO2 reaction with CyNMe2 to form a water miscible phase. The silica cake was then dried under ambient pressure with assistance of ethyl acetate as an azeotropic agent. The N2 adsorption-desorption analysis showed that, the as-prepared silica aerogel powder from a typical hydrogel had a BET surface area of 507.8 m2/g, BJH pore volume of 2.6 cm3/g, and an average pore size of 29.1 nm. The pore volume as well as a narrow particle size distribution (D50 = 6.7 μm) significantly affected the application of the as-produced silica aerogel powder as a flatting agent (FA). Film transmittance index was additionally applied for comparison of the transparence of the applied FA beside the normal extinction index as the performance index. The extinction indices of 61.7 and 52.8% and film transmittance indices of 78.3 and 86.1%, separately for both hydrophobic and hydrophilic applications were measured, hence revealing excellent performance of the as-produced silica aerogel powder.Graphical abstractGraphical abstract for this article
       
  • Self-templated synthesis of large-scale hierarchical anatase titania
           nanotube arrays on transparent conductive substrate for dye-sensitized
           solar cells
    • Abstract: Publication date: Available online 15 December 2018Source: Advanced Powder TechnologyAuthor(s): Yi-Yi Liu, Xin-Yu Ye, Hong Chen, Yu-Feng Cao, Bing-Xin Lei, Wei Sun, Zhen-Fan Sun The large-scale hierarchical anatase titania nanotube arrays on transparent conductive substrate are fabricated via in situ conversion from anatase titania nanowire arrays. The first-step hydrothermal reaction is the growth of ultra-long anatase titania nanowire arrays, and the second-step hydrothermal reaction is the conversion of titania nanowire arrays to titania nanotube arrays modified with a large number of nanosheets. The resultant hierarchical titania nanotube array film provides a large surface area and superior light scattering ability. Dye-sensitized solar cell based on the hierarchical titania nanotube array photoanode obtains a power conversion efficiency as high as 5.96% and shows a prominent increase compared to the pristine titania nanowire array photoanode (2.12%). In addition, the most interesting result is that an optimized efficiency of 7.54% is achieved for the cell based on the hierarchical titania nanotube array photoanode with titania sol modification.Graphical abstractGraphical abstract for this article
       
  • Hybrid plasma-sono-coprecipitation dispersion of NiMo nanocatalyst over
           functionalized multiwall carbon nanotube used in hydrodesulfurization of
           thiophene
    • Abstract: Publication date: Available online 11 December 2018Source: Advanced Powder TechnologyAuthor(s): Samira Ashenaeian, Mohammad Haghighi, Nader Rahemi To evaluate the effect of non-thermal plasma and ultrasound treatment on the catalytic physicochemical properties and hydrodesulfurization activity, a series of NiMoW/FMWCNT nanocatalysts (4%NiO, 12%MoO3, and 6% WO3) were prepared via co-precipitation method. The co-precipitated and treated by ultrasound or plasma-ultrasound nanocatalysts were characterized using XRD, FESEM, EDX dot-mapping, BET and FTIR techniques. The XRD data confirmed the formation of NiO, WO3, and Mo2C as the crystalline phase on carbon support. The results indicated ultrasound irradiation and non-thermal plasma treatment have significant influences on phase structure, morphology, and surface area. The optimum amount of applied voltage of plasma was found to be 500 V in which the maximum surface area and well-dispersion of the active phase were found. Further applied plasma voltage led to a decrease in catalytic activity due to the higher support-metal interaction and unpleasant distribution of the particles on nanocatalyst surface. The plasma–ultrasound hybrid synthesis method was able to eliminate 100% of sulfur in the initial solution of thiophene during hydrodesulfurization process.Graphical abstractNiMoW nanocatalyst over FMWCNT was synthesized with co-precipitation method and the effect of glow discharge plasma and ultrasound irradiations on the structure and reactivity of the catalyst was studied. XRD, FESEM, BET, and FTIR techniques were employed in nanocatalysts characterization. FESEM analysis confirmed the improved morphology of plasma-ultrasound treated nanocatalyst than ultrasound assisted nanocatalyst. The catalytic activity in hydrodesulfurization reaction was investigated at 160 °C and atmospheric pressure. Catalytic performance tests of synthesized samples showed that plasma-ultrasound assisted NiMoW/FMWCNT, where the voltage of plasma was 500 V, had complete thiophene conversion after 30 min.Graphical abstract for this article
       
  • Investigation of an FFT-based solver applied to dynamic flowsheet
           simulation of agglomeration processes
    • Abstract: Publication date: Available online 11 December 2018Source: Advanced Powder TechnologyAuthor(s): Vasyl Skorych, Maksym Dosta, Ernst-Ulrich Hartge, Stefan Heinrich, Robin Ahrens, Sabine Le Borne The growth of particles due to agglomeration is often mathematically described by population balance equations. The numerical evaluation of these equations and applying new methods to their solution is an area of increasing interest. In this contribution, a new approach for solving the agglomeration population balance model based on a separable approximation of the agglomeration kernel and a fast Fourier transformation is investigated. Its applicability within a dynamic flowsheet simulation of continuous agglomeration processes with complex structures is analysed. A simulation framework Dyssol is used to study the new method and compare it to the well-known fixed pivot technique. Studies have shown that the new approach can provide a more efficient solution if certain constraints on the number of classes and on the separation rank of the agglomeration kernel are met.Graphical abstractGraphical abstract for this article
       
  • Segregation patterns and characteristics differences of superfine
           pulverized coal ground by three pulverizing systems
    • Abstract: Publication date: Available online 10 December 2018Source: Advanced Powder TechnologyAuthor(s): Yang Ma, Jiaxun Liu, Yuanzhen Jiang, Xiumin Jiang, Junfang Ma, Xiaoye Wang, Anyao Jiao Comminution methods and segregation of coal powder are key factors affecting the characteristics of superfine pulverized coal. However, there are few articles available in this issue. In this paper, three representative pulverizing systems with diverse grinding patterns and gathering methods are selected to prepare superfine powder using the same raw coal. Afterwards, element analysis, approximate analysis, maceral determinations, surface area measurement and XPS tests are performed successively. The segregation tendencies and its influences on the coal powder are compared and discussed among three groups. Data of similar sizes in three groups receive special attentions. Based on the experiments, it is found that at the same conditions, vitrinite is easier to gain thorough crushing compared with inertinite. Due to the smaller sizes, vitrinite and ashes are prone to escape from the cyclone separator. Due to the high density, inertinite and ashes are apt to accumulate in the lower part of the coal pile. The maceral segregation imposes greater influences on the C-containing functional groups on the surfaces than the mechanochemical effects. The significances of this paper lie in figuring out the influences of grinding methods on properties and segregation patterns of superfine pulverized coal, which provide valuable references for industrial applications of this technology.Graphical abstractGraphical abstract for this article
       
  • Fabrication of graphene oxide/bentonite composites with excellent
           adsorption performances for toluidine blue removal from aqueous solution
    • Abstract: Publication date: Available online 10 December 2018Source: Advanced Powder TechnologyAuthor(s): Wenjing Xu, Yizhen Chen, Wensheng Zhang, Baojun Li The graphene oxide/bentonite (BG) composites are prepared through graphene oxide (GO) nanosheets successfully intercalated into acid-treated bentonite interlayer and deposited onto external surface. The BG composites exhibit a higher uptake capacity of toluidine blue (TB) dye from water solutions than normal bentonite owing to the synergistic effect between bentonite and GO. The as-prepared composites are characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and N2-sorption analysis. The process parameters affecting the adsorption behaviors such as initial pH, temperature, contact time and initial concentration of dye are systematically investigated. The Langmuir isotherm model fit well with the equilibrium adsorption isotherm data and the maximum adsorption capacity is 458.7 mg·g−1 at pH 8 for BG composites modified using 1% GO. The pseudo-second-order kinetic model well describes the adsorption process of TB onto BG composites. The TB adsorption on BG composites is mainly attributed to ion exchange, electrostatic interaction and intermolecular interactions. The outstanding adsorption performances of composites for the removal of TB dye from water demonstrate its significant potential for environmental applications.Graphical abstractGraphical abstract for this article
       
  • Application of oak powder/Fe3O4 magnetic composite in toxic metals removal
           from aqueous solutions
    • Abstract: Publication date: Available online 8 December 2018Source: Advanced Powder TechnologyAuthor(s): Mojtaba Shafiee, Rauf Foroutan, Keyhan Fouladi, Majid Ahmadlouydarab, Bahman Ramavandi, Soleyman Sahebi In this study, the capability of a magnetic composite of oak powder/Fe3O4 (OP/Fe3O4) for the adsorption of lead, cobalt, and nickel ions from aqueous solutions was examined. Characteristics and structure of oak powder (OP) and OP/Fe3O4 magnetic composite were explored by FTIR, SEM, TGA-DTG, VSM, and XRD analysis. The XRD results showed that OP/Fe3O4 magnetic composite and OP were in crystalline form. Kinetic behavior of adsorption process was studied using pseudo-first-order, pseudo-second-order, and Elovich models. Results indicated that the pseudo-second-order model (R2 > 0.999) can better describe the kinetic behavior of the metal adsorption process. Equilibrium behavior of the adsorption process was also tested using Langmuir, Freundlich, Dubinin–Radushkevich (D–R), and Scatchard isotherm models. The results revealed that the adsorption equilibrium data for three metals match with the Freundlich isotherm model (R2 > 0.99). This indicates the effectiveness of heterogeneous surfaces in comparison with homogeneous ones in the adsorption process of metal ions. Moreover, the results showed that the adsorption process of metal ions with the OP/Fe3O4 magnetic composite is physical. Finally, negative values of enthalpy and entropy indicated that the process of the metal ion adsorption is spontaneous and exothermic.Graphical abstractGraphical abstract for this article
       
  • Controllable SiO2 insulating layer and magnetic properties for
           intergranular insulating Fe-6.5wt.%Si/SiO2 composites
    • Abstract: Publication date: Available online 8 December 2018Source: Advanced Powder TechnologyAuthor(s): Zigui Luo, Xi'an Fan, Wentao Hu, Fan Luo, Guangqiang Li, Yawei Li, Xin Liu, Jian Wang In this study, the intergranular insulating Fe-6.5wt.%Si/SiO2 soft magnetic composites (SMCs) were prepared successfully using in-situ chemical deposition followed by the spark plasma sintering (SPS) process. The effects of ammonia concentration on the microstructure and magnetic properties of the composites have been studied systematically. The Fe-6.5wt.%Si alloy particles could be well insulated by the uniform SiO2 insulating layer, and its thickness increases with increasing the ammonia concentration from 0 to 0.02 ml/g. However, further increasing the ammonia concentration to 0.03 and 0.04 ml/g would result in the discontinuous and uneven SiO2 insulating layer. Correspondingly, the saturation magnetization and effective permeability of the composite compacts first decrease and then increase with increasing the ammonia concentration from 0.00 to 0.04 ml/g, whereas the coercivity and resistivity vary in the opposite tendency. Note that the overall performances such as the frequency stability of effective permeability, higher resistivity and lower total core loss, reach the optimal value for the sample with the ammonia concentration of 0.02 ml/g.Graphical abstractGraphical abstract for this article
       
  • In situ fabrication of α-Fe2O3/CaFe2O4 p-n heterojunction with enhanced
           VOCs photodegradation activity
    • Abstract: Publication date: Available online 7 December 2018Source: Advanced Powder TechnologyAuthor(s): Jianmin Wang, Xinchao Xu, Feng Cao, Yunan Wang, Song Li, Gaowu Qin α-Fe2O3/CaFe2O4 p-n heterojunctions were prepared via a simple in-situ hydrolysis process as highly efficient VOCs degradation photocatalyst, wherein no additional conditions such as high pressure, high temperature and surfactants were required. The structures and morphologies of the as-prepared samples were analyzed by XRD, SEM and TEM. The results revealed that α-Fe2O3/CaFe2O4 p-n heterojunctions exhibited superior photocatalytic activity of VOCs degradation compared to pure CaFe2O4 and α-Fe2O3 in both steady model and flow bed model. It can degrade more than 82% of acetaldehyde within 180 min in steady mode and 65% in flow mode under visible light irradiation. The prominent VOCs remove property could be attributed to the strong interfacial contact caused by the in-situ fabrication process and the promoted charge carrier separation efficiency due to the constructing of α-Fe2O3/CaFe2O4 p-n heterojunction. It provides some new insights into the design and fabrication of advanced photocatalytic materials with p-n heterojunction for high efficiency in VOCs photodegradation.Graphical abstractGraphical abstract for this article
       
  • Non-firing ceramics: Activation of silica powder surface by a planetary
           ball milling
    • Abstract: Publication date: Available online 5 December 2018Source: Advanced Powder TechnologyAuthor(s): Yuki Nakashima, Hadi Razavi-Khosroshahi, Hajime Ishida, Chika Takai, Masayoshi Fuji “Non-firing” ceramics have recently attracted much attention in recent years because many functional materials can be achieved by this method without the aid of sintering process. Amorphous silica powder was mechanically treated by a planetary ball mill system, by which the surface of powders was activated and simultaneously particle size reduced extensively. Surface of powders with different milling conditions was investigated by scanning electron microscopy (SEM) and nitrogen adsorption isotherm. The surface activity of raw and treated silica powders was measured based on the water adsorbed volume on the powder surface. Results showed that the powder surface was activated, and the silica powders were pulverized as an effect of ball milling. At milling times as short as 15 min, the powder was rubbed against balls, and the friction between particle/ball breaks the bonds of functional groups like SiOSi on the surface of particles. For longer milling times, powders were pulverized and more new active surfaces were formed.Graphical abstractGraphical abstract for this article
       
  • Synthesis and physical properties of un- and Zn-doped Ag2S
           nanoparticles
    • Abstract: Publication date: Available online 4 December 2018Source: Advanced Powder TechnologyAuthor(s): Mosayeb Geravand, Farid Jamali-Sheini This study is devoted to the sonochemical synthesis of un- and Zn-doped silver sulfide (Ag2S) nanostructures and evaluation of the parameters that affect its structural, morphological and optical properties. To unravel any changes in the characteristics of the particles, the XRD and FESEM techniques, in addition to photoluminescence (PL), Raman and UV–Vis spectroscopies, were applied. According to the analyses, 15 min sonication using 200 W power can provide the highest quality of the Ag2S crystals. Moreover, it was found out that Zn doping shifts the XRD peaks of Ag2S to higher angles and declines crystallinity of the samples while it does not change the spherical shape of the Ag2S particles. The other impact of Zn presence in the crystal lattice of Ag2S was declared to be increasing the size of the Ag2S nanostructures. Importantly, based on the PL results, the un- and Zn-doped Ag2S particles present several emission bands lying in the visible spectrum of light due to their specific optical near band emission (NBE) and crystal defects. As the PL spectra demonstrated, increasing the Zn concentration decreases the optical band gap energy of the Ag2S nanostructures. Also, the Raman results unraveled the impact of synthesis conditions on the optical and crystalline properties of the grown structures.Graphical abstractGraphical abstract for this article
       
  • Synthesis of a novel co-hybridization nano-apatite powder with excellent
           dispersion, well-solubility and good biocompatibility by a new strategy
    • Abstract: Publication date: Available online 1 December 2018Source: Advanced Powder TechnologyAuthor(s): Ding Haojie, Jiang Liuyun, Ma Bingli, Su Shengpei, Tang Shuo, Tang Chunyan, Wang Jinghui, Li Zhiwei, Hu Xiang It is a great challenge to achieve a novel co-hybridization nano-apatite powder with excellent dispersion, well-solubility and cell vitality. In this manuscript, a new strategy was designed, in which different types cyclodextrins of α-cyclodextrin (α-CD), β-cyclodextrin (β-CD) or γ-cyclodextrin (γ-CD) and different Mg substitute contents of 5, 10 and 20 mol% were introduced in the form of reactants. The obtained produces were characterized by FTIR, XRD, EM, EDS, dispersion experiment, and soaking in phosphate buffer saline (PBS) solution. Moreover, in vitro cell vitality of co-hybridization nano-apatite powders were conducted using bone marrow stromal cells (BMSC) of SD rat to preliminarily evaluate the biological performances. It was revealed that CD structure and Mg had been successfully incorporated in n-HA lattice, so that the crystallinity, cell parameters and crystallite sizes of CD-Mg-n-HA were remarkably decreased, and its dispersion in dichloromethane was greatly improved in contrast with the traditional n-HA. Especially, α-CD-Mg-n-HA displayed the best dispersion among the three CD-Mg-n-HA particles because the smallest central cavity of α-CD. Additionally, the β-CD-Mg-n-HA with 20 mol% Mg possessed the best dissolution in PBS due to the highest Mg content. Finally, the in vitro cell vitality results indicated that the co-hybridization nano-apatite exhibited an enhanced cytocompatibility than the traditional n-HA, in particular, the β-CD-Mg-n-HA with 20 mol% Mg showed the best cell proliferation and adhesion. The study indicated that the introduction of cyclodextrin and Mg in the form of reactants is a promising new strategy to achieve a novel hybridization nano-apatite with excellent dispersion, well-solubility and enhanced cell vitality, which would widen an expansion application in bone materials, compared with the traditional n-HA.Graphical abstractA novel co-hybridization nano-apatite with cyclodextrins and Mg (CD-Mg-n-HA) was prepared by in the reactants form of cyclodextrins instead of template method, which effectively prevented the aggregation of n-HA nanoparticles and reduced the crystallinity by inserting the cyclodextrins structure, compared with traditional n-HA or β-CD-n-HA prepared by template method. The study is promising to achieve a novel hybridization nano-apatite with excellent dispersion, well-solubility and enhanced cell vitality, so that it would widen its application in bone materials, compared with the traditional n-HA.Graphical abstract for this article
       
  • Hydrodynamic and mechanical behavior of multi-particle confined between
           two parallel plates
    • Abstract: Publication date: Available online 29 November 2018Source: Advanced Powder TechnologyAuthor(s): Guodong Zhang, Marte Gutierrez, Kun Chao A coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) approach is used to investigate the hydrodynamic and mechanical behavior of multi-particle, which settle and horizontally transport between two parallel plates. The particle-fluid interaction is two-way coupled, while inter-particle and particles-walls interactions are calculated based on the soft-sphere model. The Joint Roughness Coefficient (JRC) is used to represent the roughness of planar walls, and its effect on particle transport is quantitatively studied. When particles transport between two parallel smooth plates, the planar walls exert extra hydrodynamic retardation, which causes particle transport velocity to decrease with the decrease in the aperture between two plates. In contrast, when particles transport between two parallel rough plates, due to frequent interaction between particles, the mechanical interaction-induced retardation starts to work and further decreases particle transport velocity. Particle longitudinal migration is frequent because of inter-particle interaction, which hinders its transverse transport and even causes particle agglomeration in a duct during horizontal transport. In addition, the mechanical retardation is significantly dependent of particle transport regimes, and its effect gradually increases and changes to be dominant at high particle Reynold number regime.Graphical abstractGraphical abstract for this article
       
  • Utilization of limonitic nickel laterite to produce ferronickel
           concentrate by the selective reduction-magnetic separation process
    • Abstract: Publication date: Available online 29 November 2018Source: Advanced Powder TechnologyAuthor(s): Deqing Zhu, Liaoting Pan, Zhengqi Guo, Jian Pan, Fang Zhang Attempts to economically upgrade low nickel content laterite ore face a number of challenges, including limited ability to beneficiate the ore prior to processing due to its complex association and dissemination structure. Limonitic nickel laterite, characterized by its relatively high iron grade and low nickel content, is very difficult to upgrade. The current work explores improving the beneficiation of nickel from limonitic laterite ore through interaction of silica and calcium sulfate in a selective reduction-wet magnetic separation process. The results show that the ferronickel concentrate assaying 5.0% Ni can be obtained at a nickel recovery of 95.9%, when limonitic laterite ore is reduced at 1250 °C for 60 min with the addition of 3 wt% CaSO4, 8 wt% silica and 3 wt% graphite. The mechanism of additives in promoting the selective reduction of nickel laterite ore was also investigated by XRD, VSM, SEM-EDS and EPMA. The silicate reacted with iron oxide to form the liquid, which decreased the iron metallization ratio. S2 from the thermal decomposition of CaSO4 in a strong reducing atmosphere significantly promoted γ Fe–Ni particle growth by formation of an Fe-FeS eutectic with a low melting point.Graphical abstractGraphical abstract for this article
       
  • Al 2 O 3 -water+nanofluid+in+a+wavy+cavity+with+conductive+inner+block+using+Buongiorno’s+two-phase+model&rft.title=Advanced+Powder+Technology&rft.issn=0921-8831&rft.date=&rft.volume=">Numerical investigation of natural convection of
           Al 2 O 3 -water nanofluid in a wavy cavity with conductive
           inner block using Buongiorno’s two-phase model
    • Abstract: Publication date: Available online 28 November 2018Source: Advanced Powder TechnologyAuthor(s): I. Hashim, A.I. Alsabery, M.A. Sheremet, A.J. Chamkha By employing the finite element method, thermophoresis and Brownian diffusion are studied numerically relating to the natural convection in a wavy cavity that is filled with an Al2O3-water nanofluid possessing a central heat-conducting solid block that is influenced by the local heater located on the bottom wall. An isothermal condition is established in the two wavy vertical walls, while adiabatic condition is for the top horizontal wall. Partial heating is applied to the bottom of the horizontal wall, while the remaining part remains in the adiabatic condition. Empirical correlations are employed for the thermal conductivity and dynamic viscosity of the nanofluid. The number of oscillations (1⩽N≤4), Rayleigh number (103⩽Ra≤106), nanoparticles volume fraction (0⩽ϕ≤0.04) and dimensionless length of the bottom heater (0.2⩽H⩽0.8) govern the parameters in this study. The grid independency test, as well as experimental and numerical data from other published works, was employed to validate the developed computational code comprehensively. Based on the obtained results, it was found that the heat transfer inside the cavity is enhanced by introducing nanoparticles as well as a selection of optimal number of oscillations.Graphical abstractGraphical abstract for this article
       
  • Effect of fin type baffle on the particle hydrodynamics, separation and
           misplacement in a liquid solid fluidized bed separator
    • Abstract: Publication date: Available online 28 November 2018Source: Advanced Powder TechnologyAuthor(s): Alok Tripathy, Subhankar Bagchi, S.K. Biswal, B.C. Meikap Use of fluidization phenomenon is increasing day by day in the mineral beneficiation. Owing to the physical properties of the mineral particles, misplacement happens during the segregation. The present study aims at understanding the effect of fin type vertical baffle along with parameters such as superficial velocity, overflow height, feed composition and Mean Particle Size Ratio (MPSR) on the particle misplacement and separation in a liquid solid fluidized bed separator. The particle misplacement was evaluated quantitatively using “Misplacement Index”. It was found that the fin type vertical baffles have negligible or no effect on the particle misplacement. Moreover, change in the superficial velocity, overflow height, feed composition and MPSR substantially affects the particle misplacement. Further, there exists a critical feed composition where the misplacement is low. In addition to this, there also exists a critical MPSR where the fluidized bed operates in a completely mixed state and the point could be considered as the starting of the layer inversion.Graphical abstractGraphical abstract for this article
       
  • Effect of iron & boron content on the Spark Plasma Sintering of Ti-B-Fe
           alloys
    • Abstract: Publication date: Available online 27 November 2018Source: Advanced Powder TechnologyAuthor(s): Vikas Jindal, Aditya Sarda, Ahmed Degnah, K.S. Ravi Chandran The effect of change in iron and boron contents on the Spark Plasma Sintering behaviour in the Ti-B-Fe alloys has been investigated through dilatometric sintering study using various samples having Ti-rich compositions. These samples are adequately chosen to study the sintering behaviour on addition of boron and iron on the Ti-rich corner. The rate of sintering of Ti-B-Fe alloys was found to increase with increase in iron content. The sintering enhancement can be attributed to the high diffusivity of iron in α-Ti and β-Ti phases and due to the formation of the intermetallic phase which results in greater overall shrinkage. The shrinkage was found to decrease with increase in boron content due to greater amount of TiB2 which doesn’t participates in sintering in the observed range.Graphical abstractGraphical abstract for this article
       
  • Study on the chemical stability of the synthesized TiCx in Ti-Al-C system
           after immersion in the HF + H2O2 solution
    • Abstract: Publication date: Available online 27 November 2018Source: Advanced Powder TechnologyAuthor(s): Hamed Aghamohammadi, Akbar Heidarpour, Rasoul Jamshidi, Samad Ghasemi The aim of this study is to investigate the phase stability of the prepared TiCx in Ti-Al-C system after immersion in the mixture of hydrofluoric acid (HF) and H2O2. The powders were immersed in the solution for different period times of 24, 48 and 96 h. The phase change of powders after different immersion times was studied by X-ray diffraction (XRD). The morphology evolution was detected by the field-emission scanning electron (FESEM). Moreover, atomic absorption spectroscopy (AAS) analysis was employed to study the changes in the chemical composition of solutions. The XRD results showed that by increasing the immersion time, gradually, the TiCx decomposed. It was also found that the selection oxidation aluminum occurred and the Al2O3 was the main final product of treatments. The FESEM images also confirmed the XRD results and after immersion of the powders into the solutions the rod-like and sheet-like morphology of the Al2O3 particles were obtained.Graphical abstractGraphical abstract for this article
       
  • The preparation of self-floating Sm/N co-doped TiO2/diatomite hybrid
           pellet with enhanced visible-light-responsive photoactivity and
           reusability
    • Abstract: Publication date: Available online 26 November 2018Source: Advanced Powder TechnologyAuthor(s): Qiong Wu, Zhaohong Zhang Powdery photocatalyst has long been studied, yet its several disadvantages such as light-harvesting and recyclability in suspension system are the bottlenecks for practical application. The recent report on floating photocatalyst provided an alternative method to solve the above problem. In this paper, TiO2 nanoparticles were co-doped by samarium and nitrogen, and then supported onto natural porous mineral diatomite via sol-gel method. The composite powder was granulated to produce self-floating pellet catalyst (Sm/N co-doped TiO2/diatomite hybrid pellet), denoted as SN-TDHP. Its various physicochemical properties such as light absorbance, crystallinity, surface condition as well as morphology were systematically analyzed. The synergy between Sm and N dopants, as well as diatomite and TiO2 were studied. The photoactivity of SN-TDHP was investigated via the degradation towards an antibiotic tetracycline (TC) solution under visible light, and then the optimal co-doping amount and pellet dosage were determined. The optimal pellet catalyst presented its removal rate of TC as 87.2% within 150 min of reaction time. Moreover, self-floating SN-TDHP could simply be filtrated from the surface of water matrix, and presented good reusability after 5 repetitions.Graphical abstractGraphical abstract for this article
       
  • Calibration and verification of DEM parameters for dynamic particle flow
           conditions using a backpropagation neural network
    • Abstract: Publication date: Available online 24 November 2018Source: Advanced Powder TechnologyAuthor(s): Fangping Ye, Craig Wheeler, Bin Chen, Jiquan Hu, Kaikai Chen, Wei Chen The Discrete Element Method (DEM) requires input parameters to be calibrated and validated in order to accurately model the physical process being simulated. This is typically achieved through experiments that examine the macroscopic behavior of particles, however, it is often difficult to efficiently and accurately obtain a representative parameter set. In this study, a method is presented to identify and select a set of DEM input parameters by applying a backpropagation (BP) neural network to establish the non-linear relationship between dynamic macroscopic particle properties and DEM parameters. Once developed and trained, the BP neural network provides an efficient and accurate method to select the DEM parameter set. The BP neural network can be developed and trained for one or more laboratory calibration experiments, and be applied to a wide range of bulk materials under dynamic flow conditions.Graphical abstractGraphical abstract for this article
       
 
 
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