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Publisher: Elsevier   (Total: 3175 journals)

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Showing 1 - 200 of 3175 Journals sorted alphabetically
A Practical Logic of Cognitive Systems     Full-text available via subscription   (Followers: 9)
AASRI Procedia     Open Access   (Followers: 14)
Academic Pediatrics     Hybrid Journal   (Followers: 28, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 22, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 90, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 25, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 33, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 5)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 6, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 379, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Biomaterialia     Hybrid Journal   (Followers: 27, SJR: 2.02, h-index: 104)
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: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (Followers: 1, SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 239, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 10, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription  
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 2, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 1)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 25, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 3)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 2)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 1)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 6, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 3, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 6)
Acute Pain     Full-text available via subscription   (Followers: 14)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 7)
Additive Manufacturing     Hybrid Journal   (Followers: 9, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 22)
Advanced Cement Based Materials     Full-text available via subscription   (Followers: 3)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 130, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 8, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 12, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 27, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 10, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 14, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 2, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 28, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 7, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 3)
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: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 10, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 14, SJR: 0.223, h-index: 22)
Advances in Dermatology     Full-text available via subscription   (Followers: 14)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 10)
Advances in Digestive Medicine     Open Access   (Followers: 8)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 21)
Advances in Ecological Research     Full-text available via subscription   (Followers: 42, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 27, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 6)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 42, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 1)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 54, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Genetics     Full-text available via subscription   (Followers: 14, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 7)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 1, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 36, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 2, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 3)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 14, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 21)
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: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 3)
Advances in Oncobiology     Full-text available via subscription   (Followers: 1)
Advances in Organ Biology     Full-text available via subscription   (Followers: 1)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 6, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 5, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 10)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 7)
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: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 59)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.1, h-index: 2)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 5)
Advances in Space Research     Full-text available via subscription   (Followers: 377, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Surgery     Full-text available via subscription   (Followers: 9, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 29, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 17)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 46, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 6, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 335, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 9, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 431, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 31, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 43, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access   (Followers: 1)
Agriculture and Natural Resources     Open Access   (Followers: 2)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 56, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 11, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 9)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access   (Followers: 1)
Algal Research     Partially Free   (Followers: 9, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 5, SJR: 0.776, h-index: 35)
Alpha Omegan     Full-text available via subscription   (SJR: 0.121, h-index: 9)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 9, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 48, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 4)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 6)
American Heart J.     Hybrid Journal   (Followers: 50, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 50, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 42, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 10, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 26, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 32, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 42, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 191, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 62, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 6)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 27, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 27, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 37, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 6)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 61, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 14)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 4, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 39, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 166, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 10, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access   (Followers: 1)

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Journal Cover Advanced Powder Technology
  [SJR: 0.739]   [H-I: 33]   [16 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0921-8831 - ISSN (Online) 1568-5527
   Published by Elsevier Homepage  [3175 journals]
  • Polymeric hybrid mesoporous silica hollow nanospheres as a support for
           palladium and application of the PdNPs@PANI/HNS nanocomposite for aerobic
           benzyl alcohol oxidation
    • Authors: Sadegh Rostamnia; Saba Kholdi
      Pages: 1167 - 1174
      Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5
      Author(s): Sadegh Rostamnia, Saba Kholdi
      The polyaniline composition by silica based mesoporous hollow nanosphere (silica-HNS) was synthesized and selected as a promising solid support for palladium nanoparticle stabilization. Then the nanocomposite was applied as a nanocatalyst for aerobic benzyl alcohol oxidation reactions. Catalyst recyclability showed six successful runs for the reaction. TEM and SEM-EDX/mapping images were used to study the structure and morphology of the PdNPs@PANI/HNS. FT-IR spectroscopy, Thermal gravimetric analysis (TGA), and BET were used to characterize and investigate the catalyst nature. In addition, the amounts of Pd loading were characterized by ICP-AES technique.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.02.008
       
  • Preparation of gold/hydroxyapatite hybrids using natural fish scale
           template and their effective albumin interactions
    • Authors: Yadong Chai; Masami Nishikawa; Motohiro Tagaya
      Pages: 1198 - 1203
      Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5
      Author(s): Yadong Chai, Masami Nishikawa, Motohiro Tagaya
      The gold (Au) nanoparticles (NPs) with the diameter of 15–40 nm were successfully synthesized in the hierarchical hydroxyapatite (HAp) nanostructures of natural fish scale templates, which were carried out by the Au3+ ion chemisorption, reduction and calcination processes to form the AuNPs/HAp hybrids. The AuNPs size as well as the surface plasmon resonance (SPR) absorption maximum was preserved with the hybridization process. Moreover, the AuNPs/HAp hybrid nanostructures exhibited preferential protein adsorption behavior at the biological bovine serum albumin (Ab) concentration regions that correspond to be 1.5 μM in the cell culture medium and 15.1 μM in human blood, and the Ab adsorption equilibrium constant of AuNPs/HAp hybrid was higher than that of the HAp alone. The SPR absorption maxima of the Ab-adsorbed AuNPs/HAp fish scales were red-shifted as compared with those of the AuNPs/HAp fish scales. Therefore, we synthesized the AuNPs using the fish scale template to exhibit the preferential protein adsorption, which will be a great significance to research the AuNPs/HAp hybrid functions.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.02.011
       
  • Controlled synthesis of blue spherical CoAl2O4 pigment powder in Pickering
           emulsion assisted with a hydrothermal process
    • Authors: Ying Chang; Ting Feng; Chonggang Wu; Yuan Chen; Kai Ke; Yang Liu; Huihu Wang; Shijie Dong
      Pages: 1222 - 1229
      Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5
      Author(s): Ying Chang, Ting Feng, Chonggang Wu, Yuan Chen, Kai Ke, Yang Liu, Huihu Wang, Shijie Dong
      A spherical blue CoAl2O4 pigment powder commonly used for coloring ceramic products has successfully been synthesized by co-precipitation of Co2+ and Al3+ ions in Pickering emulsion assisted with a hydrothermal process, and the formation mechanism of the as-prepared powder has briefly been discussed. The effects of pH condition on the crystalline phase and color tone of the pigment powder were investigated at 280 °C by varying the pH value of the reaction system. Then, under an optimized pH condition to produce blue, the pigment powder was synthesized still hydrothermally at different temperatures (210, 240, 270 and 300 °C) to assess the effect of hydrothermal reaction temperature on the pigment particle morphology. The resulting pigment powders were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), CIELAB colorimetric analysis (CIE-L∗a∗b∗), laser particle size analysis (LPS), and N2-adsorption measurement (BET). FE-SEM and TEM observations indicated that the pigment powders of spherical shape obviously were constructed by a core–shell double-layer structure, the radii of which all were ∼150 nm or so with a shell of ∼25 nm in thickness. XRD results demonstrated that the pigment powders that were obtained from the aforementioned method under a wide range of pH values invariably contained basically crystalline CoAl2O4 of high purity. CIE-L∗a∗b∗ data suggested that the pigment powders at 280 °C and pH ≤ 11.2 appeared different chromas of bluish colors compared withthat displaying black which was obtained at pH = 12.3. LPS and BET results showed that the CoAl2O4 pigment powder prepared under the urea concentration of 3.6040 g for 24 h at the hydrothermal temperatures of 240 °C exhibited a narrow particle size distribution, the specific surface area of which was evaluated to be  ∼56.4 m2/g.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.02.014
       
  • The effects of friction characteristic of particle on milling process in a
           horizontal rice mill
    • Authors: Yong Zeng; Fuguo Jia; Xiangyi Meng; Yanlong Han; Yawen Xiao
      Pages: 1280 - 1291
      Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5
      Author(s): Yong Zeng, Fuguo Jia, Xiangyi Meng, Yanlong Han, Yawen Xiao
      The physical and mechanical properties of rice are of significant change during milling from brown rice to white rice, especially the friction characteristics. In order to clarify the effects of roughness of rice surface on the milling process and mechanism, in this work, motion of spherical particle in a horizontal rice mill under different static friction coefficients (i.e., between particle and cylinder sieve wall μ s,pt and between particles μ s,pp) was simulated using the discrete element method. The uniformity of axial motion and circular motion were qualitatively and quantitatively analyzed, which are characterized by introducing the axial dispersion coefficient and uniformity index, respectively. Then, the effects of static fiction coefficients on residence time and collision energy among particles were discussed. The results indicated that the μ s,pt mainly affects the axial motion while the μ s,pp primarily influences on the circular motion. The residence time is strongly affected by the uniformity of axial motion while the collision energy is significantly influenced by the uniformity of circular motion. Finally, the relationship between friction characteristics and milling performance can be described based on the method of polynomial fitting. This work is useful for providing essential references to control the quality of milled rice.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.02.021
       
  • DEM simulation and experimental validation for mechanical response of
           ellipsoidal particles under confined compression
    • Authors: Sheng-Shian Lin; Yun-Chi Chung; Chih-Kuang Lin; Yu-Chia Chen
      Pages: 1292 - 1305
      Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5
      Author(s): Sheng-Shian Lin, Yun-Chi Chung, Chih-Kuang Lin, Yu-Chia Chen
      The representation of non-spherical particles in discrete element method (DEM) has not been addressed adequately. Although the multiple sphere method (MSM) is the most popular approach to describe non-spherical particle shape, the validity of the MSM has not been established yet. The purpose of this study is to examine the validity and adequacy of the MSM. A uni-axial confined compression test was designed and set up to study the mechanical behaviour of an ellipsoidal granular assembly under vertical loading and the load transfer to the contacting boundary. Four levels of multi-sphere approximation for an axi-symmetric ellipsoidal particle were employed in DEM simulation to investigate the adequacy of multi-sphere approximation. A comparison on compression characteristics between the numerical and experimental results was made and discussed in this paper. Most of the compared physical properties showed reasonable agreement, indicating that capturing the key linear dimensions of a non-spherical particle may be sufficient to predict reasonable results. A small number of sub-spheres (say, N ≥ 5) for representing an axi-symmetric ellipsoidal particle can give plausible results. However, the DEM simulations also produced a certain extent of discrepancy in loading stiffness with experiments. Plausible explanations are provided and require further investigation.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.02.023
       
  • Hardness, wear resistance and bonding strength of nano structured
           functionally graded Ni-Al2O3 composite coatings fabricated by ball milling
           method
    • Authors: Arash Yazdani; Taghi Isfahani
      Pages: 1306 - 1316
      Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5
      Author(s): Arash Yazdani, Taghi Isfahani
      Using initial powder mixtures with different Ni:Al2O3 weight ratios ranging from 1:1 to 16:1, nano structured Ni-Al2O3 composite coatings were deposited onto an aluminum plate by means of a planetary ball mill. It was shown that initial charges with Ni:Al2O3 weight ratios of 4:1 and greater, yielded well-compact coatings. Coating deposited from the powder charge with Ni:Al2O3 weight ratio of 4:1, contained 20 vol% of alumina particles in the Ni matrix and submitted the highest hardness value (657 ± 28 Hv) and wear resistance. Nevertheless, composite coating containing smallest amount of alumina particles showed the highest cohesive strength of 9.8 ± 0.3 MPa. In the next step, nano structured functionally graded composite coatings were produced by the deposition of two separate layers containing different amounts of alumina particles. Although the graded coating showed superior hardness and wear resistance compared with the non-graded coatings, it suffers from low cohesive strength attributed to the presence of alumina particles at the interface region between the two layers. To overcome the poor adhesion between two layers, a thin intermediate plain Ni one was deposited between two layers leading to 80% and 30% improvement in the adhesion strength and wear resistance, respectively.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.02.025
       
  • Inside Front Cover (Aims & Scope, Editors)
    • Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5


      PubDate: 2018-04-15T06:56:03Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: May 2018
      Source:Advanced Powder Technology, Volume 29, Issue 5


      PubDate: 2018-04-15T06:56:03Z
       
  • A review of current techniques for the evaluation of powder mixing
    • Authors: Maryam Asachi; Ehsan Nourafkan; Ali Hassanpour
      Abstract: Publication date: Available online 12 April 2018
      Source:Advanced Powder Technology
      Author(s): Maryam Asachi, Ehsan Nourafkan, Ali Hassanpour
      Blending a mixture of powders to a homogeneous system is a crucial step in many manufacturing processes. To achieve a high quality of the end product, powder mixtures should be made with high content uniformity. For instance, producing uniform tablets depends on the homogeneous dispersion of active pharmaceutical ingredient (API), often in low level quantities, into excipients. To control the uniformity of a powder mixture, the first required step is to estimate the powder content information during blending. There are several powder homogeneity evaluation techniques which differ in accuracy, fundamental basis, cost and operating conditions. In this article, emerging techniques for the analysis of powder content and powder blend uniformity, are explained and compared. The advantages and drawbacks of all the techniques are reviewed to help the readers to select the appropriate equipment for the powder mixing evaluation. In addition, the paper highlights the recent innovative on-line measurement techniques used for the non-invasive evaluation of the mixing performance.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.031
       
  • Utilizing spray drying technique to improve oral bioavailability of
           apigenin
    • Authors: Mohammad A. Altamimi; Ehab M. Elzayat; Sultan M. Alshehri; Kazi Mohsin; Mohamed A. Ibrahim; Osaid Al Meanazel; Faiyaz Shakeel; Fars K. Alanazi; Ibrahim A. Alsarra
      Abstract: Publication date: Available online 12 April 2018
      Source:Advanced Powder Technology
      Author(s): Mohammad A. Altamimi, Ehab M. Elzayat, Sultan M. Alshehri, Kazi Mohsin, Mohamed A. Ibrahim, Osaid Al Meanazel, Faiyaz Shakeel, Fars K. Alanazi, Ibrahim A. Alsarra
      The aim of this study was to prepare, characterize, and evaluate apigenin in a solid dispersion system to improve the dissolution rate and bioavailability of such poorly soluble drug. Apigenin was dissolved in organic solvent with micelle forming polymer Pluronic F-127 (PL-F127). Solid dispersion of apigenin-PL F-127 was developed using spray drying technique. Physicochemical and in vitro characterization of the produced solid dispersion particles were conducted using scanning electron microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, powder X-ray diffractometry and dissolution study. In addition, in vivo study was performed for the spray dried versus pure and marketed apigenin. Cmax was found to be around 5 folds higher for spray dried product compared to non spray dried materials. The prepared drug:polymer formulation showed elongated particles and complete lack of crystallinity at 1:4 ratio. The change in the vibrational wave numbers strongly suggested the formation of hydrogen bonding between apigenin and PL F-127. Significant increase in the dissolution rate and bioavailability of the spray dried apigenin showed the potential of solid dispersion system to overcome problem related to BCS II drugs.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.04.002
       
  • Green synthesis and characterization of hexagonal shaped MgO nanoparticles
           using insulin plant (Costus pictus D. Don) leave extract and its
           antimicrobial as well as anticancer activity
    • Authors: Joghee Suresh; Ganeshan Pradheesh; Vincent Alexramani; Mahalingam Sundrarajan; Sun Ig Hong
      Abstract: Publication date: Available online 11 April 2018
      Source:Advanced Powder Technology
      Author(s): Joghee Suresh, Ganeshan Pradheesh, Vincent Alexramani, Mahalingam Sundrarajan, Sun Ig Hong
      Green synthesis is an ecofriendly novel technology and attractive research area for the production of metal oxide nanoparticles in bio-medical and chemical applications. The green perspective includes solvents, reductants or stabilizing agents obtained from a natural resource as they are non-toxic and ecofriendly. In this study, a sustainable green synthetic strategy to synthesize magnesium oxide nanoparticles by employing Costus pictus D. Don plant leaf extract as a reducing agent. The successful formation of magnesium oxide nanoparticles was confirmed by comprehensive characterization techniques. The presence of biomolecules and metal oxides were confirmed by Fourier transform Infrared (FT-IR) spectral data analysis. The X-ray diffraction (XRD) revealed the formation of pure cubic MgO crystalline nanoparticles. The surface morphology of MgO particles observed by Scanning electron microscope (SEM) showed the hexagonal-shaped MgO crystallites. The average size of biosynthesized MgO nanoparticles was measured to be around 50 nm by Transmission Electron Microscopy (TEM). The mechanism for the formation of MgO nanoparticles was suggested in this study. The biosynthesized magnesium oxide particles showed good antimicrobial and exhibited maximum inhibition rate for MgO nanoparticles at 200 µg showing efficient anticancer activity.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.04.003
       
  • CFD simulation of electrostatic effect on gas interchange, vortex and heat
           transfer in the gas-solid fluidized bed
    • Authors: Haotong Wang; Musango Lungu; Zhengliang Huang; Jingdai Wang; Yao Yang; Yongrong Yang
      Abstract: Publication date: Available online 10 April 2018
      Source:Advanced Powder Technology
      Author(s): Haotong Wang, Musango Lungu, Zhengliang Huang, Jingdai Wang, Yao Yang, Yongrong Yang
      Vortex and electrostatic charges in the gas-solid fluidized bed have a significant influence on its transport abilities and hydrodynamics. In this work, the electrostatic model coupled with energy model has been applied to reveal the electrostatic effect on hydrodynamics, vorticity and local heat transfer coefficients based on the kinetic theory of granular flow. The results indicate that particle vortices change the gas and solid phase interaction around the bubble and enhance the local heat transfer coefficients. Gas interchange decreases by 6.5% compared to Davidson model at the jet velocity of 10 m·s−1 and 13% of 5 m·s−1. After adding electrostatic charges, bubble diameter decreases with the increasing specific charges. Furthermore, vorticity at the initial stage of bubble formation is larger and the particle vortex diffuses to a large extent. The simulation results can be applied to modify and estimate the overall heat transfer coefficient of the fluidized bed reactor and provide the basis for studying the effect of electrostatic effect on heat transfer.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.026
       
  • Efficiency of calcium vapor tunnels on non-contact deoxidation of
           irregular titanium powder
    • Authors: Chon-Il Hong; Jung-Min Oh; Jeshin Park; Jeong-Mo Yoon; Jae-Won Lim
      Abstract: Publication date: Available online 7 April 2018
      Source:Advanced Powder Technology
      Author(s): Chon-Il Hong, Jung-Min Oh, Jeshin Park, Jeong-Mo Yoon, Jae-Won Lim
      This study developed a new process for the economical deoxidation of titanium powder in order to solve the problems associated with the previous deoxidation process. In the experiment, titanium powder with an irregular particle shape was used as the raw material with an oxygen concentration of 2100 ppm. The amount of Ca was reduced by 50% as compared to that used in a previous work and placed in an improved apparatus at a weight ratio of 2:1 (Ti:Ca). This modified deoxidation process decreased the oxygen concentration of the titanium powder to 805 ppm at 1273 K, leading to a ∼61.7% reduction of oxygen compared to the raw titanium powder. Low-oxygen irregular titanium powder can be produced at a low cost and high efficiency by applying a non-contact deoxidation process using Ca vapor.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.029
       
  • Determination of Hansen parameters for particles: A standardized routine
           based on analytical centrifugation
    • Authors: Sebastian Süß; Titus Sobisch; Wolfgang Peukert; Dietmar Lerche; Doris Segets
      Abstract: Publication date: Available online 7 April 2018
      Source:Advanced Powder Technology
      Author(s): Sebastian Süß, Titus Sobisch, Wolfgang Peukert, Dietmar Lerche, Doris Segets
      The Hansen Solubility Parameters (HSP) are powerful descriptors to evaluate interactions of (polymer) molecules and their solubility in different liquids. Although approaches do exist to transfer the HSP-concept to the question of dispersibility of particles, HSP determination of slowly sedimenting (nano)particles (NPs) is time consuming and depends on the subjective evaluation of the experimenter. Herein, we introduce a new method for HSP determination for colloidal systems using analytical centrifugation (AC) which was applied to standardize and accelerate the experimental procedure. However, as not dissolution but dispersion is in focus, we propose to use the term Hansen Dispersibility Parameters (HDP) instead of HSP whenever dispersibility and stability of particles against agglomeration/flocculation are to be discussed. First, we implemented a standard dispersion routine for the well-known, industrially highly relevant pigment carbon black (CB). Then, a standardized method for the evaluation of measured AC profiles and appropriate ranking of NPs dispersibility in different media was developed. We demonstrate outstanding reproducibility of our results by comparing HDP derived for the same CB material from independent experiments performed at two different affiliations. Finally, we show the predictive power of HDP and the accuracy of our approach by evaluating the dispersibility of CB in additional liquids and mixtures of so-called “good” and “poor” liquid media crossing the border from stable to unstable medium conditions. Our study evidences the enormous potential of AC to determine the HDP of colloidal systems using a standardized and non-subjective method to access particle interactions and colloidal stability.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.018
       
  • Facile synthesis of nano-TiO2/stellerite composite with efficient
           photocatalytic degradation of phenol
    • Authors: Xiaolong Hu; Zhiming Sun; Junying Song; Guangxin Zhang; Shuilin Zheng
      Abstract: Publication date: Available online 7 April 2018
      Source:Advanced Powder Technology
      Author(s): Xiaolong Hu, Zhiming Sun, Junying Song, Guangxin Zhang, Shuilin Zheng
      In this paper, we report a kind of nano-TiO2/stellerite composite with enhanced photoactivity, which was synthesized by a typical homogeneous precipitation method followed by a calcination crystallization process using natural stellerite as support. The as-prepared composites were characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption, high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The results showed that TiO2 loading amounts and calcination temperatures had significant influence on the adsorption and photocatalytic degradation properties of phenol. Moreover, it was indicated that the TiO2 nanoparticles (NPs) with smaller grain size (around 12.0 nm) and narrower size distributions were uniformly deposited on the surface of stellerite as a layer of film. Compared with commercial P25, the received composite exhibited more superior photocatalytic degradation performance towards phenol. The enhanced photocatalytic degradation performance should result from the better dispersibility of TiO2 NPs and higher separation efficiency of photogenerated electron-hole pairs. This work may set foundation for the practical application of this new composite photocatalyst in the field of wastewater treatment.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.030
       
  • Preparation and application of monodisperse spherical
           polymethylsilsesquioxane (PMSQ) beads by sol-gel method
    • Authors: Franklin Chau-Nan Hong; Cyun-Jhe Yan
      Abstract: Publication date: Available online 7 April 2018
      Source:Advanced Powder Technology
      Author(s): Franklin Chau-Nan Hong, Cyun-Jhe Yan
      We have prepared monodisperse polymethylsilsesquioxane (PMSQ) microspheres with the diameters of 0.5–4 μm in aqueous solution by a sol-gel method. The as-prepared PMSQ beads are modified with hexamethyldisiloxane (HMDSO) under highly acidic conditions to form hydrophobic trimethylsilylated spheres. A continuous lift-up method was developed to perform monolayer self-assembly ordered arrays of the hydrophobic PMSQ microspheres on the large area substrate (>14 cm in length). We further reported a novel patterning method to control the sizes and the pitches of the arrayed microscale patterns independently. The technology to fabricate the large area arrayed microstructures may find applications in the manufacture of flexible micro-devices.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.027
       
  • ROS mediated destruction of cell membrane, growth and biofilms of human
           bacterial pathogens by stable metallic AgNPs functionalized from bell
           pepper extract and quercetin
    • Authors: Bilal Ahmed; Anam Hashmi; Mohammad Saghir Khan; Javed Musarrat
      Abstract: Publication date: Available online 31 March 2018
      Source:Advanced Powder Technology
      Author(s): Bilal Ahmed, Anam Hashmi, Mohammad Saghir Khan, Javed Musarrat
      Yellow pepper extract and quercetin (QDH) were used for YPE-AgNPs and Q-AgNPs fabrication. The AgNPs were thoroughly characterized using standard physico-chemical techniques and were found monodispersed, pleomorphic and had variable shape and size with a lattice fringe of 0.23 nm. YPE-AgNPs and Q-AgNPs revealed a characteristic SPR band at 438 nm and 431 nm. The XRD crystal size of YPE-AgNPs and Q-AgNPs was 10.16 and 12.20 nm while TEM analysis showed a size range of 5–40 and 1–25 nm. Bio-fabricated AgNPs remained stable for at least four weeks as the SPR did not deviate with time. FTIR data revealed functionalization of AgNPs by organics of reaction mixture. AgNPs had robust antibacterial and antibiofilm activity against ESβL(+) Escherichia coli, Pseudomonas aeruginosa, and methicillin sensitive and resistant Staphylococcus aureus. Staining of isolates with fluorescent probes displayed the increased production of ROS and membrane permeability. AgNPs hampered EPS production, endorsed DNA leakage, and generated superoxide radicals. Time and concentration dependent experiments demonstrated a consistent decrease in bacterial growth. Structural changes viz. irregular margins, distortion, depressions/indentations and shrinkage of cells were obvious under SEM. AgNPs due to strong antibacterial activity could be exploited as a supplement with antibacterial drugs to control resilient human infections.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.025
       
  • Understanding the morphological effects of WO3 photocatalysts for the
           degradation of organic pollutants
    • Authors: Sangeeta Adhikari; K. Sarath Chandra; Do-Heyoung Kim; Giridhar Madras; Debasish Sarkar
      Abstract: Publication date: Available online 29 March 2018
      Source:Advanced Powder Technology
      Author(s): Sangeeta Adhikari, K. Sarath Chandra, Do-Heyoung Kim, Giridhar Madras, Debasish Sarkar
      Dimension and morphology of photocatalysts has extensive interest in order to use the effective concurrence of photon. Despite TiO2 and ZnO, WO3 has also been considered as a promising candidate in terms of remediation and purification that owes to its visible light absorption and non-toxic environmental friendliness. In this study, we report the preparation of nanostructured WO3 with different morphologies for the photocatalytic degradation of organic pollutants without the presence of any sacrificial agents. The study envisages the effect of the aspect ratio of WO3 particles on the photochemical process and their inherent reactive species mechanism. Mechanistic reasoning revealed that, apart from the hole and hydroxyl radicals as the participating species in both structures, a significant contribution from superoxide radicals takes place in the presence of nanorods and promotes the photochemical reaction. High aspect ratio facilitates the absorption coefficient and resultant efficiency. Both the catalysts retain its reactivity after regeneration and confirms the consistent catalytic reusability. Reactivity enhancement of any photocatalyst is possible through tuning the inherent structure of the material.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.024
       
  • TiO2/void/porous Al2O3 shell embedded in polyvinylidene fluoride film for
           cleaning wastewater
    • Authors: Yuqing Zhang; Yanhua Hu; Yunge Zhang; Shaomin Liu
      Abstract: Publication date: Available online 28 March 2018
      Source:Advanced Powder Technology
      Author(s): Yuqing Zhang, Yanhua Hu, Yunge Zhang, Shaomin Liu
      In order to selectively adsorb hydrolyzed polyacryamide (HPAM) and remove oil from oily wastewater, TiO2/void/porous Al2O3 shell particles (TVAs) were designed and prepared though hydrolysis and calcination; subsequently, the TVAs were embedded into polyvinylidene fluoride (PVDF) to prepare composite films (TVAP films). As polymeric supports, TVAP films were employed to immobilize TiO2 powder. TVAs were characterized using SEM, TEM, FT-IR, BET while TVAP films were characterized by SEM. The results indicate that the particle size of TVAs is mainly distributed between 700 and 800 nm, core-shell structure has been successfully built. The removal rates of TVAP films prepared under the optimum synthesis conditions for oil and HPAM reach 69.70% and 60.20% respectively, performing attractive properties of mass transfer and adsorption. Therefore, TVAP films are desirable as suitable materials to clean oily wastewater.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.023
       
  • Numerical simulation on the electric charge decay of micropowder prepared
           by jet milling/electrostatic dispersion
    • Authors: Pengfei Yin; Yu Deng; Rong Zhang; Yali Qi; Huayao Li; Yu Tao; Youhongyu Li; Qi Huang
      Abstract: Publication date: Available online 27 March 2018
      Source:Advanced Powder Technology
      Author(s): Pengfei Yin, Yu Deng, Rong Zhang, Yali Qi, Huayao Li, Yu Tao, Youhongyu Li, Qi Huang
      Preparation of micropowder by the combination of jet milling and electrostatic dispersion is an innovative method. By means of this method, it can achieve the dual goal of producing fine powders and maintaining the dispersiveness. While, the electric charge carried by particles will vanish gradually when refined powder is stored in air, which lead to that the dispersion effect of charged particles will weaken and even disappear. In this paper, a model of electric charge decay of charged particle in air is established, the influence of particle size, relative humidity of the atmosphere, relative permittivity and initial q/m i.e. charge to mass ratio of charged micropowder on the decay process are evaluated. In addition, the non-contact measuring experiment is designed to verify the simulation results as well. The results indicate that the q/m of charged particle decreases as exponential relationship with the storage time, the remained q/m and its decay rate of particle with smaller size is lower during the whole process. The decay rate of charged powder increases with the increase of relative humidity in air. Particles with higher relative permittivity has a lower decay rate of charge, and the decay rate of particles with larger initial charge to mass ratio would also be higher. The numerical results of the model could reveal the rules in electric charge decay process well in general.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.020
       
  • A two-fluid model for calcium carbonate precipitation in highly
           supersaturated solutions
    • Authors: M.C. Reis; M.F.B. Sousa; F. Alobaid; C.A. Bertran; Y. Wang
      Abstract: Publication date: Available online 27 March 2018
      Source:Advanced Powder Technology
      Author(s): M.C. Reis, M.F.B. Sousa, F. Alobaid, C.A. Bertran, Y. Wang
      Precipitation of calcium carbonate is a common phenomenon in nature, which has attracted attention from researchers due to its importance in biomineralization processes, climatic changes, and especially incrustations in pipelines. In this work, a two-fluid model is proposed for homogeneous crystallization of calcium carbonate in highly supersaturated solutions. By making an analogy between the dynamics of a granular gas and the dynamics of a solid dispersion, the proposed model not only accounts for the interaction forces between the solid particles and dispersion medium, but also for the mass transfer and changes in the particles size during the precipitation reaction. Moreover, by using a numerical scheme based on an iterative algorithm, 3D numerical simulations are performed for the homogeneous crystallization of calcium carbonate, and the results are compared with experimental particles size distributions and curves of pH versus time. The good agreement between theoretical and experimental results indicates that the two-fluid model can be successfully used to evaluate the growth kinetics of calcium carbonate nuclei.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.022
       
  • Particulate structures produced by electrosprays of colloidal silica
           suspensions in both negative and positive zeta potentials
    • Authors: Ferry Faizal; Suryani Saallah; I. Wuled Lenggoro
      Abstract: Publication date: Available online 27 March 2018
      Source:Advanced Powder Technology
      Author(s): Ferry Faizal, Suryani Saallah, I. Wuled Lenggoro
      Interaction between surface charge (zeta potential) of colloidal silica nanoparticles and the charge-induced droplets suspended in the gas phase by electrospray is investigated for the first time based on the particle physical (morphology, size, and size distribution) and optical properties. Colloidal silica nanoparticles having negative and positive zeta potential were subjected to electrospray in both negative and positive mode, and deposited on a substrate (silicon wafer). Visual observation of the substrate with particle deposition shows various white shades, corresponding to the changes in optical properties, as supported by the ultraviolet-visible–near-infrared spectroscopy. Microscopic analysis revealed the strong correlation between the colloid surface charge and charging mode (positive or negative) of the sprayed droplets to the particle morphology and size. The findings of the present study demonstrate the capability of the electrospray method to tune the physical and optical properties of colloidal silica nanoparticles with different surface charges.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.015
       
  • Drag, lift and torque acting on a two-dimensional non-spherical particle
           near a wall
    • Authors: Ahad Zarghami; Johan T. Padding
      Abstract: Publication date: Available online 27 March 2018
      Source:Advanced Powder Technology
      Author(s): Ahad Zarghami, Johan T. Padding
      Gas-solid granular flows with non-spherical particles occur in many engineering applications such as fluidized beds. Such flows are usually contained by solid walls and always some particles move close to a wall. The proximity of a wall considerably affects the flow fields and changes the hydrodynamic forces and torque acting on particles moving near the wall. In this paper, we numerically investigate the drag, lift and torque acting on a non-spherical particle in the vicinity of a planar wall by means of lattice Boltzmann simulations. To gain an exhaustive understanding of the complex hydrodynamics and study the influence of various geometrical and flow parameters, a single 2D elliptical particle is selected as our case study. In the simulations, the effect of particle Reynolds number, distance to the wall, orientation angle and aspect ratio on drag, lift and torque is studied. Our study shows that the presence of a wall causes significant changes in hydrodynamic forces, with increasing or decreasing drag and lift forces, depending on the distance from the wall. Even the direction of lift and torque may change, depending on both the distance from the wall and particle orientation angle. Also, an ellipse with higher AR experiences larger hydrodynamic forces and torque whatever the gap size and orientation angle.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.019
       
  • Synthesis of hollow structural hydroxyapatite with different morphologies
           using calcium carbonate as hard template
    • Authors: Xu Xia; Jiwei Chen; Juan Shen; Di Huang; Peizhen Duan; Guohong Zou
      Abstract: Publication date: Available online 24 March 2018
      Source:Advanced Powder Technology
      Author(s): Xu Xia, Jiwei Chen, Juan Shen, Di Huang, Peizhen Duan, Guohong Zou
      Hydroxyapatite (HAp) with hollow structure was successfully synthesized by hydrothermal process of as-prepared calcium carbonate used as a hard template and calcium sources in a diammonium phosphate solution. Calcium carbonate was fabricated by precipitation, which possessed different morphologies such as balls, rods and blocks through regulating the amount of citric acid. The synthesized powders were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrograph (FT-IR), field-emission scanning electron microscope (FESEM) and high-resolution transmission electron microscopy (HRTEM) and nitrogen adsorption–desorption. Results indicated that different morphologies calcium carbonate could convert to hollow structural HAp with the higher BET surface area and the mesopores. Hydrothermal temperature and hydrothermal time play a slight role on transition percentage. As hydrothermal temperature and hydrothermal time increased, the conversion rate of calcium carbonate to hydroxyapatite increased. The possible formation mechanism of hydroxyapatite was preliminarily investigated. The resultants of HAp are interesting materials for drug delivery and sustained-release.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.021
       
  • Hydrodynamic characteristics in a pilot-scale cold flow model for chemical
           looping combustion
    • Authors: A.K. Dubey; A. Samanta; P. Sarkar; M.K. Karmakar; A. Mukherjee; C. Loha; M. Kumar; S.G. Sahu; V.K. Saxena; P.K. Chatterjee
      Abstract: Publication date: Available online 24 March 2018
      Source:Advanced Powder Technology
      Author(s): A.K. Dubey, A. Samanta, P. Sarkar, M.K. Karmakar, A. Mukherjee, C. Loha, M. Kumar, S.G. Sahu, V.K. Saxena, P.K. Chatterjee
      Chemical Looping Combustion (CLC) in two interconnected fluidized beds, i.e., the air reactor and the fuel reactor has been recognized to be promising. As the CLC setup design is critical and sensitive to oxygen carrier (OC) materials, it is very much essential to investigate hydrodynamics in a specially fabricated cold model set up for the successful development and operational control of corresponding large-scale hot model. In this study, a pilot-scale cold flow model CLC system has been designed and tested. The riser and fuel reactor were operated at circulated fluidized bed and bubbling fluidized bed conditions, respectively and the control of solid circulation between two reactors was done by two loop seals operated in bubbling fluidized bed conditions. The effect of fluidization velocity in the riser on the voidage profiles, solid circulation rate, and pressure profiles were investigated using Indian ilmenite (150–212 µm) as OC. The stable operation of the system was established under various operational conditions. The results will be useful for the development of ilmenite based hot model CLC system. Moreover, the achievable variations of solid circulation rate in the present study in cold model setup will determine obtainable limit of extent of oxygen transport and thermal energy.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.017
       
  • Continuous microwave assisted flow synthesis and characterization of
           calcium deficient hydroxyapatite nanorods
    • Authors: Aneela Anwar; Samina Akbar
      Abstract: Publication date: Available online 22 March 2018
      Source:Advanced Powder Technology
      Author(s): Aneela Anwar, Samina Akbar
      Synthetic calcium deficient hydroxyapatite (CDHA) nanorods (<100 nm) were rapidly prepared with the help of a new continuous microwave assisted flow synthesis (CMFS) reactor in 5 min only from aqueous solution of calcium hydroxide and orthophosphoric acid at pH 8.5. The effect of various reaction parameters like, pH, concentration, temperature, residence time, degree of crystallinity and particle surface area were studied in detail. The phase purity, particle size and morphology of the powder samples were characterised by techniques such as X-ray diffraction analysis, transmission electron microscopy, scanning electron microscopy and FTIR and Raman spectroscopy. With the help of X-ray photoelectron spectroscopy, the chemical analysis was completed. Measurements were taken into account to estimate the particle size following the dynamic light scattering. The results showed that the employed synthesis procedure offered an efficient and economical route to achieve high quality nano-sized products with suitable size and low level of impurities.
      Graphical abstract image

      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.014
       
  • Heavy metal fixing and heat resistance abilities of coal fly ash-waste
           glass based geopolymers by hydrothermal hot pressing
    • Authors: Huiping Song; Lifang Wei; Yinglu Ji; Liqiong Cao; Fangqin Cheng
      Abstract: Publication date: Available online 21 March 2018
      Source:Advanced Powder Technology
      Author(s): Huiping Song, Lifang Wei, Yinglu Ji, Liqiong Cao, Fangqin Cheng
      Hydrothermal hot pressing (HHP) was used to prepare high compressive strength fly ash-wasted glasses based geopolymers, which was subject to thermal analysis and the test of heat resistance as well as heavy metal solidification. Results showed that the geopolymers had good efficiency of encapsulating and fixing heavy metals. As for heavy metal element like Cu, Zn, Cd and Pb, the fixed efficiency reach at least 95%. Heat resistance test showed that the most mass-loss ratio of geopolymers was below 11.04% and the compressive strength was more than 55.27 MPa when it was calcined at 200–1000 °C for 2 h. During the calcining, geopolymers had gone through several main processes, including the evaporation of the free water, the bound water and constitutional water, the decomposition of carbonate, combustion of carbon, and crystallization reaction. XRD and FT-IR analysis showed that when calcined at 1000 °C, there produced several new crystallization phases with good heat resistance, including nepheline, kyanite, sillimanite. The improvement of this work does not only reflect that the hydrothermal hot pressing is featured by simple procedures, easy automation, timesaving and low cost, and also provide a long-term goal project, which could meet both demands: utilizing solid waste, saving resources and protecting the environment.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.013
       
  • Enhanced thermo-mechanical and electrical properties of carbon-carbon
           composites using human hair derived carbon powder as reinforcing filler
    • Authors: Ravindra Kumar; Suyash Varshney; Kamal K. Kar; Kinshuk Dasgupta
      Abstract: Publication date: Available online 21 March 2018
      Source:Advanced Powder Technology
      Author(s): Ravindra Kumar, Suyash Varshney, Kamal K. Kar, Kinshuk Dasgupta
      In the present study, human hair derived carbon powder (HHC) synthesized in home laboratory is characterized via SEM, AFM, FT-IR, XRD, Raman, XPS, and TGA. Then HHC is used as a low cost reinforcing filler at 0–50 wt% with phenolic resin for fabricating carbon fabric reinforced polymer composites (CPCs) and its carbon-carbon composites (CCs). CPCs are fabricated via simple hand-lay techniques for resin-HHC slurry impregnation followed by hot pressing while CCs are obtained by carbonization of CPCs at 600 and 900 °C. Effects of HHC loading on CPCs and CCs are evaluated through static and dynamic mechanical thermal analysis, density, electrical conductivity, morphology, and microstructure studies. Tensile and flexural properties (strength and modulus) of CPCs and CCs improve significantly (∼25 to 73%) at 30 wt% HHC loading. Storage modulus (E′) and loss modulus (E″) of CPCs increase up to 132 and 104%, respectively with addition of HHC up to 40 wt%. E′ and E″ of unfilled CCs increase with carbonization temperature, however they decrease with increasing HHC content. In addition to high specific properties, CCs also exhibit substantial increment (∼233%) in electrical conductivity and thermal stability, which make HHC one of the most suitable material for high temperature-structural applications.
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      PubDate: 2018-04-15T06:56:03Z
      DOI: 10.1016/j.apt.2018.03.004
       
  • Facile synthesis of layered sodium disilicates as efficient and
           recoverable nanocatalysts for biodiesel production from rapeseed oil
    • Authors: Abolfazl Ghaffari; Mahdi Behzad
      Abstract: Publication date: Available online 25 February 2018
      Source:Advanced Powder Technology
      Author(s): Abolfazl Ghaffari, Mahdi Behzad
      In this study, α, β and δ phases of layered sodium disilicates were synthesized and used as heterogeneous catalysts for transesterification of rapeseed oil with methanol to methyl esters (biodiesel). The catalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) technique, Fourier transform infrared spectroscopy (FT-IR), N2 adsorption-desorption, and thermogravimetric analysis (TGA-DTA). δ-Na2Si2O5 showed better catalytic efficiency than the other two phases of sodium disilicate, and showed excellent activity at the optimized conditions. The transesterification conditions, such as the catalyst dosage, molar ratio of methanol to oil, reaction temperature and reaction time were investigated. The results revealed that with a catalyst loading of 4 wt%, methanol to oil ratio of 30:1, reaction temperature of 65 °C and reaction time of 3 h, conversion of biodiesel reached 97.8%.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.019
       
  • Effect of filler load and high-energy ball milling process on properties
           of plasticized wheat gluten/olive pomace biocomposite
    • Authors: Asma Boudria; Yasmina Hammoui; Nawel Adjeroud; Nabila Djerrada; Khodir Madani
      Abstract: Publication date: Available online 24 February 2018
      Source:Advanced Powder Technology
      Author(s): Asma Boudria, Yasmina Hammoui, Nawel Adjeroud, Nabila Djerrada, Khodir Madani
      The increase of particles surface area can optimize the dispersion state of biocomposite components and enhance their properties. First in this paper, we aimed to elaborate a novel biocomposite without any treatments. Plasticized wheat gluten (WG), was filled with 0–20% of olive pomace (OP) powder. The second objective was the improvement of biocomposite properties using physical treatment. High-energy ball milling process was applied on the blend of wheat gluten and olive pomace powders (MPs). The grinding effect of particle shape, size and distribution in biocomposite was characterised by particle size distribution using a laser-light diffraction and by SEM analysis. The cryo-fractured surface of selected films, mechanical properties, moisture absorption and thermal properties of both biocomposites were described in details. It was found that the sensitivity of biocomposites to moisture absorption was reduced with the increase of filler content after the applying of high-energy ball milling process. The thermal stability of OP biocomposite decreased with the increase of loading, while that of MPs was unaffected by high-energy ball milling process. This process affects the physical and morphological characteristics of the powders. The mechanical properties were improved by grinding process at filler content lower than15%.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.015
       
  • PABA-assisted hydrothermal fabrication of W18O49 nanowire networks and its
           transition to WO3 for photocatalytic degradation of methylene blue
    • Authors: Hang Chen; Wanlin Cai; Xiaoqing Gao; Jianmin Luo; Xintai Su
      Abstract: Publication date: Available online 24 February 2018
      Source:Advanced Powder Technology
      Author(s): Hang Chen, Wanlin Cai, Xiaoqing Gao, Jianmin Luo, Xintai Su
      W18O49 nanowire networks have been fabricated by a facile hydrothermal method. In this method, p-aminobenzoic acid (PABA) was used as an assistant agent to control the morphology transformation. W18O49 and its products annealed at different temperature were characterized by XRD, SEM, TEM, UV–vis absorption spectroscopy, XPS, TGA, and FTIR. Formation mechanism and thermal stability of W18O49 nanowire networks were studied in detail. The experiment data showed that PABA played an important role in the induced crystal growth of W18O49 nanowires along [0 1 0] axis. In transformation, the structure of samples was controlled: from irregular particles to nanowire networks. W18O49 nanowire networks were annealed at different temperature. The nanowire networks collapsed at 450 °C, while WO3 nanocrystals were obtained. The W18O49 nanowire networks annealed at 400 °C have a superior photocatalytic performance to degrade methylene blue and its specific surface area was up to 147 m2 g−1.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.020
       
  • Flow pattern transition and coal beneficiation in gas solid fluidized bed
           with novel secondary distributor
    • Authors: Xuchen Fan; Chenyang Zhou; Yuemin Zhao; Chenlong Duan; Qingxia Liu
      Abstract: Publication date: Available online 24 February 2018
      Source:Advanced Powder Technology
      Author(s): Xuchen Fan, Chenyang Zhou, Yuemin Zhao, Chenlong Duan, Qingxia Liu
      Gas solid fluidized bed (GSFB) is an effective method of dry coal separation. In this study, porous sponge was introduced into a typical gas solid fluidized bed as secondary air distribution layer (PSFB) to stabilize the fluidized bed layer. The difference between PSFB and GSFB in flow pattern transition process was studied. Compared with GSFB, the minimum gas velocity and bed density fluctuation decreased while bed expansion ratio increased in PSFB. Furthermore, the distribution of bubble phase and emulsion phase were more homogeneous in PSFB. Under the operational conditions, the results of coal preparation in a PSFB showed that the ash content of clean coal was 10.25% .The probable error (E) was 0.095 g/cm3, indicating that PSFB could provide a novel way for a good performance of dry coking coal beneficiation.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.018
       
  • Reversible CO2 capture by ZnO slurry leading to formation of fine ZnO
           particles
    • Authors: Ikuo Yanase; Satoshi Konno; Hidehiko Kobayashi
      Abstract: Publication date: Available online 24 February 2018
      Source:Advanced Powder Technology
      Author(s): Ikuo Yanase, Satoshi Konno, Hidehiko Kobayashi
      ZnO powders were synthesized by heating precursors, prepared by the addition of ethylene diamine tetraacetate to an aqueous solution of zinc acetate, at 500 °C in air. A ZnO slurry was prepared by adding distilled water to the synthesized ZnO powder. X-ray diffraction studies confirmed that the ZnO slurry adsorbed CO2 at 25 °C under a CO2 gas flow to produce Zn5(CO3)2(OH)6. The CO2 adsorption ratio of the ZnO slurry was influenced by the amount of added water. When the weight ratio of water/ZnO was 1, the ZnO slurry had the largest CO2 adsorption ratio. Scanning electron microscopy and thermal gravimetry showed that the plate-like Zn5(CO3)2(OH)6 particles thermally decomposed at 300 °C in air leading to a single-phase ZnO powder consisting of nanoparticles with approximately 20 nm in diameter. The specific surface area of the reformed ZnO powder increased to approximately 82 m2/g through the thermal decomposition of Zn5(CO3)2(OH)6. The ZnO slurry was capable of adsorbing CO2 under a CO2 flow at 25 °C and desorbing CO2 under an air flow at 300 °C. The CO2 adsorption ratio of the ZnO slurry reached 80%–90% at 25 °C even after the fifth CO2 adsorption and desorption cycle.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.016
       
  • Mathematical modeling of heat and mass transfer effects on MHD peristaltic
           propulsion of two-phase flow through a Darcy-Brinkman-Forchheimer porous
           medium
    • Authors: M.M. Bhatti; A. Zeeshan; R. Ellahi; G.C. Shit
      Abstract: Publication date: Available online 23 February 2018
      Source:Advanced Powder Technology
      Author(s): M.M. Bhatti, A. Zeeshan, R. Ellahi, G.C. Shit
      This article deals with the combined effects of heat and mass transfer on the peristaltic propulsion of two-phase fluid flow through a Darcy-Brinkman-Forchheimer porous medium with compliant walls. The Sisko fluid model together with small particles is considered in the presence of extrinsic magnetic field and chemical reaction. It is well-known that different biological fluids behave like a Newtonian or non-Newtonian fluid depending upon the shear rates. The non-Newtonian fluid models are more complicated than Newtonian fluid and difficult to express using the single constitutive relationship between stress and strain rate. These constitutive equations provide a complex mathematical formulation and become numerous challenges to find numerical and analytical solutions. Small magnetic particles are helpful to manipulate and control the two-phase flow by magnetic force. Moreover, it is also beneficial in drug targeting for the treatment of different diseases. Further, two-phase flow plays an important role to examine the muscular expansion and contraction during the propagation of various biological fluids. An appropriate approximation is considered such as long wavelength and creeping flow regime to model the governing equations. Analytical solutions are obtained using the perturbation method. Moreover, numerical computations are performed to determine the features of peristaltic pumping. The results of different rheological properties for particle and fluid phase are discussed mathematically as well as graphically for different sundry parameters. The current analysis has an extensive amount of applications in medical engineering and also significant importance of smart fluid pumping systems in various engineering processes.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.010
       
  • Application of fractional factorial design for green synthesis of
           cyano-modified silica nanoparticles: Chemometrics and multifarious
           response optimization
    • Authors: Marwa S. Elazazy; Ahmed A. Issa; Maha Al-Mashreky; Maitha Al-Sulaiti; Khalid Al-Saad
      Abstract: Publication date: Available online 22 February 2018
      Source:Advanced Powder Technology
      Author(s): Marwa S. Elazazy, Ahmed A. Issa, Maha Al-Mashreky, Maitha Al-Sulaiti, Khalid Al-Saad
      Cyano-functionalized spherical silica nanoparticles (SNPs) were synthesized via Stöber method. A 2 k-p IV–fractional factorial design (2 k-p IV–FFD) was used to smartly prepare monodispersed evenly distributed SNPs. Six factors were considered; concentrations of tetraethylorthosilicate (TEOS), 3-Cyanopropyltriethoxysilane (CPTS), water, and ammonia, reaction time (RT) and stirring time (ST). Two responses; particle size (PS, measured by SEM) and particle-size distribution (PSD, calculated as standard deviation, ±SD) were measured. Control charts were used to decide on impacts of linear and two-way interactions on both responses. Derringer’s function was used to consolidate these multifarious responses into a uniform execution characteristic. Both screening and optimization were always accompanied by ANOVA testing at a 95.0% confidence interval (CI). The ideal synthetic conditions were obtained from the composite desirability plots. Cyano-functionalized SNPs with an average PS of 474.04 ± 86.71 nm were produced. Raman spectroscopy and FTIR were used to confirm the functionalization process. Thermogravimetric analysis (TGA) was used to evaluate the thermal behavior of synthesized particles.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.012
       
  • Shed light on submerged DC discharge synthesis of low band gap gray Zn/ZnO
           nanoparticles: Formation and gradual oxidation mechanism
    • Authors: Azin Ziashahabi; Reza Poursalehi; Naimeh Naseri
      Abstract: Publication date: Available online 22 February 2018
      Source:Advanced Powder Technology
      Author(s): Azin Ziashahabi, Reza Poursalehi, Naimeh Naseri
      Synthesis of colloidal metal oxides with controllable size and morphology is burgeoning field of research in nanoscience. Low band gap gray Zn/ZnO colloidal nanoparticles were fabricated by plasma-liquid interaction of DC arc discharge in water. Scanning electron microscopy, X-ray diffraction and UV–vis spectroscopy were employed for morphology, crystal structure and optical characterizations respectively. Optical emission spectroscopy was used to investigate the plasma properties during the synthesis and formation mechanism of nanoparticles. Nanoparticles with different size and shape were fabricated only by adjusting discharge current during synthesis without introducing any chemical agent. Electric discharge current was set to 20, 50, 100 and 150 A during synthesis. Estimated values of plasma excitation energies were 2.41, 2.66, 2.86 and 3.04 eV and diameter size of nanoparticles were 63, 42, 37 and 29 nm for these applied currents respectively. Synthesized nanoparticles were dark gray as prepared and became more transparent gradually getting white color finally. XRD and UV–vis results revealed that the oxidation process was time dependent. The colloidal nanoparticles composed of two metal and metal-oxide phase and white crystalline ZnO achieved after complete oxidation process. These results provided a flexible and versatile method to synthesize metal oxide nanoparticles with controlled composition.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.017
       
  • Hydrothermal synthesis and infrared to visible up-conversion luminescence
           of Ho3+/Yb3+ co-doped Bi2WO6 nanoparticles
    • Authors: Hong Li; Hongshun Hao; Shanshan Jin; Weihua Guo; Xiaofei Hu; Hongman Hou; Gongliang Zhang; Shuang Yan; Wenyuan Gao; Guishan Liu
      Abstract: Publication date: Available online 21 February 2018
      Source:Advanced Powder Technology
      Author(s): Hong Li, Hongshun Hao, Shanshan Jin, Weihua Guo, Xiaofei Hu, Hongman Hou, Gongliang Zhang, Shuang Yan, Wenyuan Gao, Guishan Liu
      In this paper, Ho3+/Yb3+ co-doped Bi2WO6 (Ho3+/Yb3+-Bi2WO6) nanoparticles were successfully synthesized by a facile hydrothermal method followed by a heat treatment process. X-ray diffraction, field emission-scanning electron microscopy, energy dispersive spectroscopy and up-conversion luminescence spectra were used to characterize the as-synthesized Ho3+/Yb3+-Bi2WO6. The effects of Yb3+ concentration on up-conversion luminescence properties were investigated. Under 980 nm laser excitation, two emission peaks centered at 546 nm and 655 nm corresponding to the 5F4, 5S2 and 5F5 transitions, respectively, to the 5I8 ground state were observed. Power studies revealed that a two-photon process was involved in the up-conversion emissions and the probable up-conversion emission mechanisms were discussed according to the energy transfer process. This study confirms that Bi2WO6 could be a potential host to achieve desired up-conversion luminescence and might be potentially applied in the fields of photocatalysis and solar cells.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.013
       
  • High-temperature and short-time hydrothermal fabrication of nanostructured
           ZSM-5 catalyst with suitable pore geometry and strong intrinsic acidity
           used in methanol to light olefins conversion
    • Authors: Parisa Sadeghpour; Mohammad Haghighi
      Abstract: Publication date: Available online 21 February 2018
      Source:Advanced Powder Technology
      Author(s): Parisa Sadeghpour, Mohammad Haghighi
      High temperature hydrothermal synthesis method was developed to preparation of nanostructured ZSM-5 molecular sieves at short crystallization time. A series of catalysts were synthesized at various temperatures and crystallization times for achievement of pure ZSM-5 phase with MFI structure. The synthesized catalysts were investigated with XRD, FESEM, EDX, BET-BJH, FTIR and TPD-NH3 techniques. The results revealed that hydrothermal synthesis conditions generally affected the nucleation rate, particle size, textural properties and acidic nature of ZSM-5 catalysts. It was found that pure ZSM-5 materials with high crystallinity could be obtained at specific crystallization conditions of about 300 °C for 1.5 h and also 350 °C for 0.5 h. Increasing the hydrothermal temperature to 350 °C and decreasing the crystallization time to 0.5 h led to the formation of small particles with high specific surface area of 392 m2/g. Furthermore, ammonia TPD spectra showed that ZSM-5(300-1.5) catalyst contained higher amount of acid sites and less acid strength compared to ZSM-5(350-0.5) catalyst. The catalytic performance of samples was studied for conversion of methanol to light olefins under different reaction conditions. Interestingly, the combination of proper pore geometry along with the strong intrinsic acidity of ZSM-5(350-.0.5) catalyst resulted in a tendency for excessive production of light olefins. The selectivity of light olefins over this catalyst was increased about 94% in the long time on stream (2100 min). Also, the possible reaction pathway for ZSM-5 synthesis at high temperatures was discussed in details.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.009
       
  • Numerical simulation of soot formation in pulverized coal combustion with
           detailed chemical reaction mechanism
    • Authors: Masaya Muto; Kohei Yuasa; Ryoichi Kurose
      Abstract: Publication date: Available online 19 February 2018
      Source:Advanced Powder Technology
      Author(s): Masaya Muto, Kohei Yuasa, Ryoichi Kurose
      A two-dimensional unsteady numerical simulation with a detailed chemical reaction mechanism that considers 158 species and 1804 reactions is applied to pulverized coal combustion in a mixing layer and the soot formation behavior is investigated in detail. The computational conditions and ignition process are the same as those in our previous work (Muto et al., 2017). The results show that the peak of the mass density of the soot is distributed in the region where the gas temperature is higher than the unburned gas temperature of the mixture of volatile matter and air (1300–1400 K) and lower than the flame temperature (2000 K ∼ ). This is due to the fact that soot formation from the precursors (C2H2 and C6H6) is enhanced as the gas temperature increases, whereas the quantities of the precursors and the produced soot are reduced due to oxidation at the higher gas temperature condition that exists close to the flame. The peak value of the mass density of the soot is also distributed in the region between the peak values of the gas temperature and the probability density function of the number of coal particles.
      Graphical abstract image

      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.002
       
  • Influence of the dimensions of spheroniser plate protuberances on the
           production of pellets by extrusion-spheronisation
    • Authors: M. Zhang; X.K. Li; D.I. Wilson; T.T. Yao; Y.Y. Zhang
      Abstract: Publication date: Available online 17 February 2018
      Source:Advanced Powder Technology
      Author(s): M. Zhang, X.K. Li, D.I. Wilson, T.T. Yao, Y.Y. Zhang
      The influence of the dimensions of square-patterned pyramidal protuberances on a spheronisation plate on pellet yield, size and shape distributions, surface tensile strength and surface morphology was investigated using a 45wt% microcrystalline cellulose/water paste. Tests were conducted using four extrudate diameters (1.0, 1.5, 2.0 and 2.5 mm) generated by screen extrusion and seven plate geometries, including a flat plate as a control. Geometrical analyses of the protuberance shapes provide some insight into the observed differences. Sharper protuberances reduced yield (promoting breakage and attrition) but tended to give narrower size distributions and less even pellet surfaces. The pellet yield for 1 mm extrudates was also subject to losses caused by fragments passing through the 1.0 mm gap between the plate and the spheroniser wall. Pellet tensile strengths were noticeably greater for 1.0 mm diameter extrudates, which is attributed to the greater extensional strain imparted on the paste during the extrusion step. For some geometries there is an optimal ratio of extrudate to protuberance dimensions.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.003
       
  • Synthesis of mesoporous geopolymeric powder from LD slag as superior
           adsorbent for Zinc (II) removal
    • Authors: Chayan Sarkar; Jayanta Kumar Basu; Amar Nath Samanta
      Abstract: Publication date: Available online 14 February 2018
      Source:Advanced Powder Technology
      Author(s): Chayan Sarkar, Jayanta Kumar Basu, Amar Nath Samanta
      Linz-Donawitz(LD) slag Geopolymer(LDSGP), a porous aluminosillicate geopolymeric adsorbent, has been synthesized from steel plant LD slag for efficient removal of Zinc(II) ions from wastewater, thus presenting a solution for converting industrial waste to adsorbent for wastewater treatment. The colloid paste of raw LD slag and the alkaline activator (10 M NaOH + sodium silicate (1:1 w/w)) has been cured for 3 days at low temperature to geopolymerize the calcium oxide rich LD slag. The BET surface area of LDSGP adsorbent (30.84 m2/g) has improved considerably compared to raw LDS (4.85 m2/g) and the FESEM and HRTEM images reveal the presence of micropetal and cauliflower like structures at outer surface of the adsorbent particles. The mesoporous nature of LDSGP adsorbent can be understood by analyzing N2 adsorption-desorption and pore size distribution plot. The PXRD pattern of LDSGP adsorbent powder confirms the presence of Ca2SiO4 and Ca3SiO5 in the geopolymeric matrix. Langmuir isotherm model correlates the batch adsorption data of Zn2+ ions onto LDSGP particles at 298 K, 308 K and 318 K. The maximum Zn2+ ions adsorption capacity of LDSGP is 86 mg/g at 318 K. The adsorption kinetic data is correlated with pseudo-second-order model indicating chemisorption of Zn2+ ions onto LD slag geopolymeric powder adsorbent.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.005
       
  • Preparation of high silica microporous zeolite SSZ-13 using solid waste
           silica fume as silica source
    • Authors: Yuanhui Wang; Jieyu Chen; Xinrong Lei; Yuujie Ren; Ji Wu
      Abstract: Publication date: Available online 13 February 2018
      Source:Advanced Powder Technology
      Author(s): Yuanhui Wang, Jieyu Chen, Xinrong Lei, Yuujie Ren, Ji Wu
      Silica fume (SF) is a kind of solid waste that produced in the process of industrial silicon smelting. The disposal of SF for environmental problem is of great urgency. Here, a facile and novel one-step approach of high silica microporous materials SSZ-13 (SF-SSZ-13) were hydrothermally synthesized using silica fume (SF) as silica source. This method requires significantly shorter reaction times (48 h) compared to conventional SSZ-13. The as-synthesized SF-SSZ-13 exhibited high purity structure, popcorn-like morphology, and a large BET surface area of 545.74 m2 g−1. Additionally, on the basis of controlled growth under different hydrothermal times, the formation mechanism of the SF-SSZ-13 outlined for further extension to other materials. The results on time- and energy-efficient of SF-based preparation of SSZ-13 pave the way for the reducing the cost of production of raw materials and decreasing environment load of solid waste, and also extend the application of silica fume.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.001
       
  • Rapid microwave-assisted solvothermal synthesis and visible-light-induced
           photocatalytic activity of Er3+-doped BiOI nanosheets
    • Authors: Jian-hong Peng; Yuan-juan Zhao; Qadeer Ul Hassan; Hong-yi Li; Yong-bao Liu; Sheng-hua Ma; Duo-lu Mao; Hai-qin Li; Lei-chao Meng; Mirabbos Hojamberdiev
      Abstract: Publication date: Available online 13 February 2018
      Source:Advanced Powder Technology
      Author(s): Jian-hong Peng, Yuan-juan Zhao, Qadeer Ul Hassan, Hong-yi Li, Yong-bao Liu, Sheng-hua Ma, Duo-lu Mao, Hai-qin Li, Lei-chao Meng, Mirabbos Hojamberdiev
      BiOI nanosheet photocatalysts with different Er3+ doping contents were rapidly synthesized by microwave-assisted solvothermal method using water and ethylene glycol as a mixed solvent. All synthesized photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), N2 adsorption, photoluminescence (PL) spectra, and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalytic activities of the as-prepared Er3+-doped BiOI nanosheets were investigated by the photodegradation of Rhodamine B (RhB) dye in aqueous solution under visible light irradiation. The photodegradation results indicate the optimal doping of 1 mol.% Er3+ in BiOI nanosheets (doping content is from 0 mol.% to 4 mol.%) to be the most beneficial for photodegradation of RhB. 1Er-BiOI nanosheets also possesses good photocatalytic activity for representative anionic methyl orange (MO). From the scavenger testing results, the reactive species of holes (h+) and superoxide radical anions ( O2−) show major impacts on the photodegradation progress of RhB and MO dyes over 1Er-BiOI photocatalyst under visible light irradiation.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.007
       
  • Flower-like SnO2/g-C3N4 heterojunctions: The face-to-face contact
           interface and improved photocatalytic properties
    • Authors: Xin Wang; Pengrong Ren
      Abstract: Publication date: Available online 13 February 2018
      Source:Advanced Powder Technology
      Author(s): Xin Wang, Pengrong Ren
      Series of SnO2/g-C3N4 heterojunctions with face-to-face contact have been synthesized by a two-step process. The morphology and photocatalytic property can be adjusted by tailoring the content of g-C3N4 in the heterostructures. The heterojunctions present flower-like morphology and vary the size of flower with the increase of the g-C3N4 content. The 50% SnO2/g-C3N4 heterojunctions exhibit the best performances for photodegradation of rhodamine B under solar light, which is attributed to the effective interfacial contact between SnO2 and g-C3N4, leading to the increased charge transfer and prolonged charge-hole separation time. Moreover, SnO2/g-C3N4 heterojunctions possess excellent stability after 4 recycling runs, because the face-to-face contact interface provides a large contact area, thus forming a close combination of two phases and guaranteeing effective separation of photogenerated carriers. Furthermore, a possible photocatalytic mechanism is analyzed and it is demonstrated that the hydroxyl radical species play an important role for the photocatalytic activity. This research highlights the promising applications of SnO2/g-C3N4 heterojunctions photocatalysts in the field of water purification and environmental remediation.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.02.006
       
  • On the features of mechanochemical synthesis of Y-Cu equiatomic powder
           mixture
    • Authors: M. Dashevskyi; N. Belyavina; O. Boshko; L. Kapitanchuk; O. Nakonechna; S. Revo
      Abstract: Publication date: Available online 9 February 2018
      Source:Advanced Powder Technology
      Author(s): M. Dashevskyi, N. Belyavina, O. Boshko, L. Kapitanchuk, O. Nakonechna, S. Revo
      Structural features of nanocomposite YCu powder material obtained by mechanical alloying of the equiatomic Y-Cu elemental powder mixture in a high-energy ball mill have been characterized by X-ray diffraction, and scanning electron microscopy. It has been shown that YCu compound with a full ordered CsCl-type structure along with YCu2 intermetallic have formed at early stage of the milling process (10 min) while a long-time processing product contains these phases as well as Y2O3 oxide. The nanoindentation measurements of the bulk samples compacted after 60 and 120 min of milling have revealed that the mean hardness values H for these samples are higher than those for conventional bulk YCu intermetallic obtained by arc melting. The main reasons for hardness increase are fine-grained microstructure and reinforcement of material by Y2O3 particles uniformly distributed throughout the volume.
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      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.01.029
       
  • A parametric study of dispersed laminar gas-particle flows through
           vertical and horizontal channels
    • Authors: Subrat Kotoky; Amaresh Dalal; Ganesh Natarajan
      Abstract: Publication date: Available online 5 February 2018
      Source:Advanced Powder Technology
      Author(s): Subrat Kotoky, Amaresh Dalal, Ganesh Natarajan
      Particle diameter, particle phase material density and inlet particle volume fraction are three important parameters governing the flow physics of dispersed gas-particle flows. In this work, an inhouse numerical solver is developed to investigate the effects of particle diameter (Stokes number), particle phase material density, inlet particle volume fraction and inlet phase velocities in the flow characteristics of gas-particle flows through vertical and horizontal channels and also in open domains. It is found that, for a constant inlet particle volume fraction, lower diameter particles attain a higher steady state velocity at any section inside the channel than the higher diameter particles; while the corresponding steady state gas velocity at any section increases with increase in particle diameter. On the other hand, for a constant particle diameter, the steady state gas phase velocity at any section decreases with increase in inlet particle volume fraction. Significant changes in both gas and particle velocity and volume fraction profiles have also been observed with inlet slip, i.e., when the velocities of both the phases at inlet are distinct as opposed to being equal, keeping all other flow and physical parameters invariant.
      Graphical abstract image

      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.01.024
       
  • Tailoring synthesis of Ni3S2 nanosheets with high electrochemical
           performance by electrodeposition
    • Authors: Yanhong Li; Min Shi; Li Wang; Meiri Wang; Jing Li; Hongtao Cui
      Abstract: Publication date: Available online 5 February 2018
      Source:Advanced Powder Technology
      Author(s): Yanhong Li, Min Shi, Li Wang, Meiri Wang, Jing Li, Hongtao Cui
      Nickel sulfide nanosheets with high electrochemical performance were successfully synthesized by an electrochemical deposition method. It is interesting to notice that the size, thickness and surface area were simply tailored by adjusting the initial potential during synthesis without changing other reaction conditions. The highest electrochemical performance was achieved on the nickel sulfide sample prepared at initial potential of −0.9 V. This sample not only presented high specific capacitance at low current density (1958.0F g−1 at 3.3 A g−1), but also exhibited excellent high rate performance (672.8F g−1 at 98.7 A g−1). To the best of our knowledge, these values are in the highest level as compared with other works. The high electrochemical performance of nickel sulfide sample originates from its thin thickness.
      Graphical abstract image

      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.01.026
       
  • Effects of composition on the microwave absorbing properties of
           FexNi100−x (x = 0–25) submicro fibers
    • Authors: Yonglin Yao; Meiying Zhu; Chuanfu Zhang; Youqi Fan; Jing Zhan
      Abstract: Publication date: Available online 5 February 2018
      Source:Advanced Powder Technology
      Author(s): Yonglin Yao, Meiying Zhu, Chuanfu Zhang, Youqi Fan, Jing Zhan
      The morphology and composition of a material have important influences on its electromagnetic parameters and microwave absorbing property. In this paper, the Fe x Ni100− x (x = 0–40) powders were prepared by an oxalate precipitation-thermal decomposition process. When x = 0–25, the powders show submicro fibrous morphologies, however, when x > 25, some granular particles appear due to the weak coordination ability of ethylenediamine with Fe2+ in the oxalate precipitation process. The electromagnetic parameters and microwave absorbing properties of the composites of the Fe x Ni100− x (x = 0–25) submicro fibers with 80 wt% paraffin were studied in 2–18 GHz. Compared with the Ni/paraffin composite, enhanced electromagnetic losses and microwave absorbing properties are observed for the Fe10Ni90/paraffin and Fe25Ni75/paraffin composites. The Fe10Ni90/paraffin shows the best microwave absorbing property that at the composite thickness of 2.0 mm, the effective bandwidth and minimum RL reach 3.78 GHz (12.21–15.99 GHz) and −45.37 dB at 13.90 GHz, respectively. The excellent microwave absorbing property of the Fe10Ni90/paraffin composite is from its high loss factor and the quarter-wavelength cancellation mechanism.
      Graphical abstract image

      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.01.028
       
  • Investigation of a double shrouded probe for particle sampling in high
           velocity airflows
    • Authors: Nae-Gang Heo; Sang-Hee Woo; Jun-Hyung Lim; Se-Jin Yook; Kang-Ho Ahn
      Abstract: Publication date: Available online 3 February 2018
      Source:Advanced Powder Technology
      Author(s): Nae-Gang Heo, Sang-Hee Woo, Jun-Hyung Lim, Se-Jin Yook, Kang-Ho Ahn
      An accurate forecast of the concentration of fine dust in the atmosphere is critical because of the negative public health impacts associated with high concentrations of particulate matter. To achieve an accurate forecast, large volumes of data need to be collected over a wide range of regions to act as forecast model boundary conditions. Therefore, the concentration of fine particles should be measured at both fixed observatories and from a range of moving monitoring stations, including cars, trains, and aviation vehicles. To accurately record particulate concentrations at flow velocities up to 200 km h−1, this study proposed a double-shrouded probe design based on the widely used single-shrouded probe. Using the double-shrouded probe, isokinetic sampling for PM2.5 was achieved at velocities up to 200 km h−1, and for PM10 at velocities up to 75 km h−1. When flow velocities exceeded these values and particle sizes increased, particulate concentrations were overestimated. However, as compared to the single-shrouded probe, the double-shrouded probe reduced the level of overestimation markedly.
      Graphical abstract image

      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.01.025
       
  • Modeling breakage and motion of black pepper seeds in cryogenic mill
    • Authors: Bhupendra M Ghodki; K. Charith Kumar; T.K. Goswami
      Abstract: Publication date: Available online 3 February 2018
      Source:Advanced Powder Technology
      Author(s): Bhupendra M Ghodki, K. Charith Kumar, T.K. Goswami
      The present investigation aims to represent three-dimensional motion and breakage phenomena of black pepper seeds in the cryogenic mill (hammer mill) using discrete element method (DEM). In DEM modeling, bonded particle model was coupled with Hertz-Mindlin contact model. Calibration method was used to select appropriate model (bond) parameters. The calibrated set of bond parameters includes 3.12 × 1011 Pa m−1 normal stiffness; 1.56 × 1011 Pa m−1 shear stiffness; 3.88 × 108 Pa critical normal stiffness; 1.94 × 108 Pa critical shear stiffness. Besides, the validity of calibrated parameters was tested in the hammer mill. The observed qualitative and quantitative results (breakage and flow pattern) of numerical and experimental approaches were in good agreement. Based on these results, a few prefatory suggestions were provided to improve the design aspects of the mill. Overall, DEM modeling offered a better understanding of particle breakage and flow pattern in the mill.
      Graphical abstract image

      PubDate: 2018-02-26T12:41:17Z
      DOI: 10.1016/j.apt.2018.01.023
       
 
 
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