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Publisher: Elsevier   (Total: 3042 journals)

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Showing 1 - 200 of 3042 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 19, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 16, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 81, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 23, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 27, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 326, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription  
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 203, 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: 9, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 22, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 5, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 4, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 3)
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: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 124, 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: 9, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 24, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, 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: 21, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, 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: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 25, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
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: 24, 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: 8, 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: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 4)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 39, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 40, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 44, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 12)
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: 20, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 24)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 34, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 4)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, 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: 5, 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: 22)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
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: 4)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
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: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 21, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 13)
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: 7, 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: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 58)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 2, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 339, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Surgery     Full-text available via subscription   (Followers: 6, 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: 15)
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: 43, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 311, 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: 4, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 7, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 398, 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: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 38, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 50, 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: 9, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 5)
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  
Algal Research     Partially Free   (Followers: 8, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
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)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 6, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 46, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 5)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 3)
American Heart J.     Hybrid Journal   (Followers: 46, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 45, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 34, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 6, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 15, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 30, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 24, 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: 44, 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: 182, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 54, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 2)
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: 23, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 23, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 21, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 33, 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: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 52, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 4)
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: 2, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 161, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 8, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Anesthésie & Réanimation     Full-text available via subscription  
Anesthesiology Clinics     Full-text available via subscription   (Followers: 21, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 153, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (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  [3042 journals]
  • A review on sustainable synthesis of zeolite from kaolinite resources via
           hydrothermal process
    • Authors: Tijjani Abdullahi; Zawati Harun; Mohd Hafiz Dzarfan Othman
      Pages: 1827 - 1840
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Tijjani Abdullahi, Zawati Harun, Mohd Hafiz Dzarfan Othman
      Synthesis of zeolite through hydrothermal process has been commonly used for decades. However, it does not satisfy the serious terms of sustainability that leads to reduction of costs, reduction of waste, eliminating negative environmental impacts and improvement of any system efficiency. The bottom line of this review paper is to highlight the current trends in the hydrothermal synthesis of zeolite, attention is paid to the utilization of natural resources and manufacturing wastes as raw materials to synthesize zeolite. Optimum conditions for sustainable hydrothermal synthesis of zeolites from kaolinite natural resources are also studied and discussed in this paper.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.028
       
  • Flotation of coarse composite particles: Effect of mineral liberation and
           phase distribution
    • Authors: Saeed Farrokhpay; Daniel Fornasiero
      Pages: 1849 - 1854
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Saeed Farrokhpay, Daniel Fornasiero
      The objective of this study is to relate the flotation of coarse composite particles with their mineral composition. For this purpose, composites of quartz particles in lead borate matrix were fabricated in different size fractions. The quartz in the composite particles was selectively hydrophobised. The composite particles were floated and backscattered scanning electron microscopy was used to measure the number of particles in each flotation product, their size and liberation class. Results showed that the flotation of these composite particles decreased with increasing particle size, and decreasing the quartz (the hydrophobic phase) liberation class. Furthermore, it was also found that diesel oil addition improves the adhesion of composite particles with bubbles, and consequently enhances their flotation recovery.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.03.012
       
  • Base fluids with CNTs as nanoparticles through non-Darcy porous medium in
           convectively heated flow: A comparative study
    • Authors: T. Hayat; Zakir Hussain; B. Ahmed; A. Alsaedi
      Pages: 1855 - 1865
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): T. Hayat, Zakir Hussain, B. Ahmed, A. Alsaedi
      Comparative analysis for flow of CNTs nanofluids is discoursed in the presence of non-Darcy porous medium. The consequences of homogeneous/heterogeneous process and heat transfer through convection are employed. The flow induced is due to non-linear stretching sheet of variable thickness. The bottom of the variable thickness sheet is heated by convective processes from a heated fluid. The velocity, temperature and concentration functions are formulated for the stretched flow problem. Convergence control variables and square residual errors for series solutions are obtained through OHAM (Optimal Homotopy Analysis Method). Biot number corresponds to larger temperature distribution in case of MWCNT than SWCNT. Comparison of nanoparicles SWCNT and MWCNT for the CNTs nanofluid fluids is highlighted. Water and engine oil CNTs fluids have higher magnitude of Nusselt number when compared with kerosene oil CNT fluid. The heat transfer rate in the presence of MWCNT is higher than SWCNT. Comparison of present study with previous published data is made. The outcomes are found in favorable agreement.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.003
       
  • The synthesis, activation and characterization of charcoal powder for the
           removal of methylene blue and cadmium from wastewater
    • Authors: Nicoleta Popa; Maria Visa
      Pages: 1866 - 1876
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Nicoleta Popa, Maria Visa
      Charcoal prepared from biomass, wastes of the local forest (tree branches), activated with NaOH solution and with Degussa P25 (TiO2) was used as adsorbent and photocatalyst for the removal of cadmium cations and methylene blue from wastewater. These materials were characterized by using atomic force microscopy for roughness surface. The energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis indicate the existence of nano TiO2 on the charcoal surface. Additionally, the FT-IR spectroscopy measurements indicate that the alkali treatment develops hydroxyl groups on charcoal surface which could adsorb methylene blue, heavy metals and other pollutants via the synergistic effect. The activities of the charcoal (BC), activated charcoal (BCA) and BCA/TiO2 mixture (BCA-D) depend on the contact time, adsorbent dosage and pH. The adsorption kinetic data were tested using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The kinetic studies showed that the adsorption is followed by the pseudo-second-order reaction with regard to the intraparticle diffusion rate kinetics.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.014
       
  • Surface modification of basic copper carbonate by mechanochemical
           processing with sulfur and ammonium sulfate
    • Authors: Zhao Li; Min Chen; Xuewei Li; Zhiwu Lei; Jun Qu; Pengwu Huang; Qiwu Zhang; Fumio Saito
      Pages: 1877 - 1881
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Zhao Li, Min Chen, Xuewei Li, Zhiwu Lei, Jun Qu, Pengwu Huang, Qiwu Zhang, Fumio Saito
      Mechanochemical phenomena including mechanical activation and direct reaction have been widely observed particularly from dry grinding operation and various applications of the phenomena have been reported in many fields of chemistry. A new approach was introduced here to trigger partial reaction by co-grinding samples with small addition of water/liquid to achieve the purpose of surface modification with new phase formed. As one example, basic copper carbonate was wet ground with elemental sulfur and appropriate additives such as ammonium sulfate to transform the surface chemical composition from oxide to sulfide. Physicochemical characterizations of the prepared samples were conducted by a set of analytical methods, including X-ray diffraction analysis, Fourier Transform infrared spectroscopy, Raman spectroscopic analysis, SEM morphology analysis, Zeta potential and the dissolved copper concentration measurement. The beneficiation efficiency of the modified copper carbonate by a conventional froth flotation used usually for sulfide minerals was examined as a quantitative evaluation to optimize the experimental conditions for the modification operation. A metal yield over 80% was obtained easily after one step concentrating of the flotation operation, indicating that mechanochemically surface controlling concept may serve as a novel pathway to enrich and recycle carbonate-style nonferrous resources by applying the traditional mineral processing technology on the modified samples.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.017
       
  • Processing of Cu-Fe and Cu-Fe-SiC nanocomposites by mechanical alloying
    • Authors: Mina Rabiee; Hamed Mirzadeh; Abolghasem Ataie
      Pages: 1882 - 1887
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Mina Rabiee, Hamed Mirzadeh, Abolghasem Ataie
      The Cu-Fe and Cu-Fe-SiC nanocomposite powders were synthesized by a two step mechanical alloying process. A supersaturated solid-solution of Cu-20wt% Fe was prepared by ball milling of elemental powders up to 5 and 20h and subsequently the SiC powder was added during additional 5h milling. The dissolution of Fe into Cu matrix and the morphology of powder particles were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. It was found that the iron peaks in the XRD patterns vanish at the early stages of mechanical alloying process but the dissolution of Fe needs more milling time. Moreover, the crystallite size of the matrix decreases with increasing milling time and the crystallite size reaches a plateau with continued milling. In this regard, the addition of SiC was found to be beneficial in postponing the saturation in crystallite size refinement. Moreover, the effect of SiC on the particle size was found to be significant only if it is added at the right time. It was also found that the silicon carbide and iron particles are present after consolidation and are on the order of nanometer sizes.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.023
       
  • Synthesis of mesoporous ZSM-5 from rice husk ash with ultrasound assisted
           alkali-treatment method used in catalytic cracking of light naphtha
    • Authors: Reza Khoshbin; Ramin Karimzadeh
      Pages: 1888 - 1897
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Reza Khoshbin, Ramin Karimzadeh
      A series of mesoporous ZSM-5 zeolite was synthesized with ultrasonic assisted alkali-treatment technique and their catalytic activity was investigated in catalytic cracking of light naphtha. ZSM-5 zeolite was synthesized from rice husk ash without using any organic template. Effect of alkali-treatment conditions on physicochemical properties of synthesized zeolite was investigated with XRD, FESEM, TEM, N2 adsorption-desorption isotherm, NH3-TPD and TGA technique. It was found that ultrasound energy facilitates the creation of hierarchical structure of ZSM-5 during alkali-treatment. According to XRD analysis, zeolite structure was preserved after 20min ultrasonic assisted alkaline treatment. However, prolonged dessilication time led to the destruction of MFI zeolite structure. The synthesized ZSM-5 represented highly ordered hexagonal-shape morphology. With increasing alkali-treatment time, the plough land roughness appeared on the surface of zeolite. Comparison of the textural properties samples revealed that the mesopore surface area of alkali-treated samples increased considerably with the increase of ultrasonic assisted alkali-treatment time. Results from catalytic activity tests showed that ultrasound energy has great influence on the activity of ZSM-5. The sample had the highest activity after alkali-treated for 20min in presence of ultrasound energy which was due to their appropriate hierarchical structure.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.024
       
  • Magnetic 99mTc- core-shell of polyethylene glycol/polyhydroxyethyl
           methacrylate based on Fe3O4 nanoparticles: Radiation synthesis,
           characterization and biodistribution study in tumor bearing mice
    • Authors: Ahmed M. Elbarbary; I.A. Ibrahim; H.M. Shafik; Sameh H. Othman
      Pages: 1898 - 1910
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Ahmed M. Elbarbary, I.A. Ibrahim, H.M. Shafik, Sameh H. Othman
      Magnetic nanoparticles (Fe3O4) coated with polyethylene glycol (PEG), (Fe3O4/PEG), were synthesized by chemical co-precipitation of Fe2+/Fe3+ salts by aqueous ammonia in PEG solution. Radiation polymerization of 2-hydroxyethyl methacrylate (HEMA) monomer solution onto Fe3O4/PEG was performed at different doses to synthesize (Fe3O4/PEG)-pHEMA, namely FPH, nanocomposites. Properties of FPH nanocomposites were characterized by FT-IR, XRD, SEM, TEM, DLS, ESR and TGA techniques. The XRD of FPH nanocomposites showed all the peaks of Fe3O4 nanoparticles. SEM was used to assess the surface morphology of FPH. TEM showed that the average diameter of FPH nanocomposites was in the range of 9–40nm. The thermal stability of FPH nanocomposites was higher than that of Fe3O4 and Fe3O4/PEG. Radio-labeling of (Fe3O4/PEG)-pHEMA nanocomposite irradiated at 10kGy (FPH10) with 99mTc was performed using stannous chloride as reducing agent. Factors affecting the labeling yield (%) such as the substrate amount, the amount of reducing agent, the pH of reaction medium, the reaction time and the reaction temperature were investigated. The maximum labeling yield was 93% using 0.25mg of FPH10 at pH 6 and 20min reaction time. The biodistribution study of 99mTc-FPH10 was examined on two groups of ascites and solid tumor bearing mice. The biodistribution results referred that 99mTc-FPH10 was rapidly uptake in tumor sites ascites or solid tumors. The results indicated that FPH nanocomposites could be potentially used for tumor imaging and therapy.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.025
       
  • Exfoliation of non-swelling muscovite on dodecylammonium chloride
           intercalation between layers using wet-jet milling
    • Authors: Yuichi Tominaga; Keiji Fukushima; Yoshitaka Takezawa; Daisuke Shimamoto; Yusuke Imai; Yuji Hotta
      Pages: 1911 - 1919
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Yuichi Tominaga, Keiji Fukushima, Yoshitaka Takezawa, Daisuke Shimamoto, Yusuke Imai, Yuji Hotta
      The exfoliation of layered muscovite with non-swelling property has been performed by combining various processes, such as heating, intercalation, and wet-jet milling. The c axis of muscovite was expanded from 2004.0 to 2022.8pm at 800°C without the destruction of crystallinity of muscovite. The heating at 800°C led to the weak attraction force between potassium ions and silicate layers by hydroxylation of muscovite. The muscovite heated at 800°C progressed the intercalation of dodecylammonium chloride (DDAC) into the layers effectively. Furthermore, the DDAC molecules were inserted to the interlayer of muscovite effectively by suppressing the formation of micelle of DDAC. The sedimentation test of wet-jet milled muscovite slurry showed that the relative packing density of muscovite was decreasing with increasing the amount of the intercalated DDAC. As results, the aspect ratio of muscovite prepared with combining the heating, the intercalation and the wet-jet milling was increased by 253% as compared to the raw muscovite. The aspect ratio was calculated from laser particle size distribution and thickness size distribution which was estimated from field emission-scanning electron microscopic images. The expansion of the interlayer led to the effective exfoliation of muscovite with high aspect ratio.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.026
       
  • Structural analysis and tracking of micron-sized glass particles during
           shear deformation: A study based on time-resolved tomographic data
    • Authors: L. Handl; L. Torbahn; A. Spettl; V. Schmidt; A. Kwade
      Pages: 1920 - 1929
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): L. Handl, L. Torbahn, A. Spettl, V. Schmidt, A. Kwade
      The interplay between structure and mechanical properties of fine and cohesive granular matter is of wide interest and far from being well understood. In order to study this relationship experimentally, it is desirable to record as much information on the particles and their motion behavior as possible during a shear experiment – ideally, the trajectory of every single particle. Observing the particle movements offers deep insights into changes in the mechanical behavior of the bulk (e.g., densification, loosening or formation of failure areas) and into the behavior of single particles. However, obtaining particle-level information on the dynamics of an entire shear-tester experiment remains a great challenge. In this paper we present an experiment and analysis methods which allow the extraction of the trajectories of almost all particles within a shear-tester. A fully functional micro shear-tester was developed and implemented into an X-ray microtomography device. With this combination we can visualize all particles within small bulk volumes of the order of a few μl under well-defined mechanical manipulation. The processing of time-resolved tomographic data makes it possible to localize and track particles despite large angle increments of up to 5° between tomographic measurements. We apply our methods to a torsional shear experiment with spherical micron-sized particles (∼30μm) and analyze the structural evolution of the sample. In addition, particle tracks provide detailed insights into the formation and evolution of the shear band.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.002
       
  • Rebound behavior of nanoparticle-agglomerates
    • Authors: M. Gensch; A.P. Weber
      Pages: 1930 - 1942
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): M. Gensch, A.P. Weber
      In general, the rebound behavior of particles depends on the particle/substrate material combination and the particle size. In the present investigation the rebound behavior of nanoparticle agglomerates is investigated in a low pressure impactor and compared to single spherical particles. For agglomerates, their structure and mechanical strength will also affect the rebound behavior. The rebound of openly structured agglomerates (fractal dimension Df <2) is determined by the primary particle size and the particle-substrate combination. The impact velocity required for rebound (critical velocity) is independent of the agglomerate size and equal to the critical velocity of single spherical particles having the same size as the primary particles. In case of agglomerate fragmentation no rebound was observed for openly structured agglomerates. For denser agglomerates (Df >2), the critical impact velocity decreases with increasing agglomerate size, where the decrease is more accentuated for higher fractal dimensions, finally approaching the behavior of spheres.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.003
       
  • Oxygen functionalized carbon nanocomposite derived from natural illite as
           adsorbent for removal of cationic and anionic dyes
    • Authors: Gaofeng Wang; Shan Wang; Wen Sun; Zhiming Sun; Shuilin Zheng
      Pages: 1943 - 1953
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Gaofeng Wang, Shan Wang, Wen Sun, Zhiming Sun, Shuilin Zheng
      Oxygen functionalized carbon nanocompositse (O-I@C) based on glucose and illite were obtained through mild hydrothermal process and surface oxidation. The surface properties of the prepared O-I@C were analyzed by Boehm titration, scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and Specific surface area (BET). The results showed that the surfaces of the prepared O-I@C nanocomposites were functionalized with abundant oxygen-containing functional groups (OFGs). The functionalized O-I@C nanocomposites were proven to be effective adsorbents for fast removal of congo red (CR) and methylene blue (MB) from aqueous solution within 10min. It is demonstrated that the initial pH of dyes solution has an important influence on the adsorption process of both CR and MB, indicating that the OFGs created on the surfaces of the materials are responsible for the promoted adsorption ability. Furthermore, it is also proved that the adsorption isotherms of CR and MB obey the Langmuir model, with the maximum adsorption capacities of 238.40mg/g and 215.28mg/g, respectively. In addition, the used materials could be regenerated by washing with NaOH solution and reused at least four times, which exhibits potential applications as efficient and easily reusable adsorbents for the rapid removal of anionic dye CR and cationic dye MB from wastewater.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.004
       
  • Experimental investigation and FE simulation of spherical indentation on
           nano-alumina reinforced copper-matrix composite produced by three
           different techniques
    • Authors: A. Wagih; A. Fathy
      Pages: 1954 - 1965
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): A. Wagih, A. Fathy
      Preparation of metal matrix composites with homogenously distributed reinforcement is a difficult process. The process can be even more complex when the reinforcement particles are nano-particles. In this paper, three different techniques (dry mixing, mechanical alloying and mechanochemical) were applied to produce Cu-Al2O3 nano composite with three different Al2O3 content (2.5, 7.5 and 12.5.wt.%). XRD, SEM and EDX analysis were conducted to analyse the physical and structural properties of the produced samples. Rockwell hardness test and compression test were applied to determine the mechanical properties of the produced composites. A 2D axisymmetric FE model was implemented using commercial software to predict the Rockwell hardness of the prepared samples. The results show that dry mixing and mechanical alloying techniques are valid for production of metal matrix composites with large reinforcement particle size and low reinforcement content. However, mechanochemical technique can be used to produce Cu-Al2O3 nano composite with high reinforcement weight fractions. Homogenously distributed dispersed nano alumina copper matrix can be achieved by applying mechanochemical technique and as a result, the mechanical and physical properties can be improved. The hardness predicted by the presented FE model correlates well with the experimental observation.
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      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.005
       
  • Particle size tuning in scalable synthesis of anti-oxidized copper fine
           particles by polypeptide molecular weights
    • Authors: Tetsu Yonezawa; Hiroki Tsukamoto; Mai Thanh Nguyen
      Pages: 1966 - 1971
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Tetsu Yonezawa, Hiroki Tsukamoto, Mai Thanh Nguyen
      Size tuning of metallic copper fine particles is highly important for their application to conductive pastes. Uniformly sized metallic copper fine particles could be successfully obtained by a chemical reduction of CuO micro powders using hydrazine in the presence of polypeptides as the stabilizing regent. Easy tuning of their particle sizes was successfully achieved via controlling the molecular weight of polypeptides. The obtained particles were covered by polypeptide capsules which were approximately 2wt% of total mass. They are highly stable even under ambient conditions.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.006
       
  • Effects of particle shapes to achieve angle of repose and force
           displacement behaviour on granular assembly
    • Authors: Manoj Khanal; Marc Elmouttie; Deepak Adhikary
      Pages: 1972 - 1976
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Manoj Khanal, Marc Elmouttie, Deepak Adhikary
      Circular or spherical particles in Discrete Element Method (DEM) possess limitations on achieving desired angle of repose for some granular assemblies. However, by using various shapes/clumps of particles, the limitation posed by the circular or spherical particles on achieving angle of repose can be minimized. In this paper, 2D DEM simulation has been used to investigate the effect of particle shapes on (a) angle of repose, where the aim is to achieve the angle of repose of 35° observed in a laboratory scale sand pile experiment, and (b) force displacement behaviour of granular assembly. The simulated results show that the particle shapes have strong influence on the angle of repose but have a less effect on force displacement behaviour on the granular assembly.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.016
       
  • Droplet size and morphology analyses of dry liquid
    • Authors: Kohei Kido; Takashi Sumoto; Yoshihide Yasui; Yoshinobu Nakamura; Syuji Fujii
      Pages: 1977 - 1981
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Kohei Kido, Takashi Sumoto, Yoshihide Yasui, Yoshinobu Nakamura, Syuji Fujii
      Dry water is a free-flowing powder consisting of numerous solid particle-stabilized water droplets with typical sizes and volumes of 10−6–10−4 m and 10−3–103 pL, respectively. We describe the first characterization of dry water stabilized with hydrophobic silica nanoparticles, by using laser diffraction droplet size distribution analysis. The water droplet dimensions were measured to be a few tens of micrometers in air, by using the laser diffraction method. These dimensions correspond well with measurements by both laser diffraction and optical microscopy methods for a Pickering-type water-in-n-dodecane emulsion prepared by dispersing dry water in n-dodecane. Optical microscopy confirmed that the dry water consisted of flocs of non-spherical water droplets, and the flocs ranged in size from a few tens of micrometers to a few millimeters in air. On the basis of these results, the flocs of water droplets were proposed to dissociate into individual water droplets under the air blast during droplet size measurement by the laser diffraction method. It was also confirmed that pressurizing the dry water between two glass slides led to encapsulated water leaking from the silica nanoparticle shells. This on-demand pressure-sensitive water leak phenomenon shows a possible usage of the dry waters as a material delivery carrier.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.04.027
       
  • Investigation on the film-coating mechanism of alumina-coated rutile TiO2
           and its dispersion stability
    • Authors: Xiongbo Dong; Zhiming Sun; Lei Jiang; Chunquan Li; Shuilin Zheng
      Pages: 1982 - 1988
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Xiongbo Dong, Zhiming Sun, Lei Jiang, Chunquan Li, Shuilin Zheng
      The alumina and alumina-coated rutile TiO2 samples were synthesized by the chemical liquid deposition method under various pH values and aging temperature. The prepared samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), ζ-potential as well as X-ray photoelectron spectroscopy (XPS). The relationship between pH values, the dispersion stability, crystalline types and microstructure of alumina-coated rutile TiO2 samples were studied. It is indicated that the coating film exhibited amorphous hydrous alumina (at pH 3–7), boehmite (at pH 7–9) and bayerite (pH > 11), respectively. And the higher aging temperature was in favor of the elevation of boehmite content of coating film. As the boehmite content increased, the dispersion stability was gradually enhanced and the prepared sample exhibited optimum dispersion stability at pH 9 and aging temperature 200°C, respectively. The increase of steric hindrance and electrostatic repulsion led to the promotion of dispersion stability via coating hydrous alumina film on the surface of rutile TiO2. The detection of AlO and the significantly enhancement of AlOTi intensity confirmed that the film coating process should be main attributed to both chemical bonding and physical adsorption.
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      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.001
       
  • Corrigendum to ‘Preparation of titanium dioxide nanoparticles supported
           on hexagonal mesoporous silicate (HMS) modified by oak gall tannin and its
           photocatalytic performance in degradation of azo dye’ [Adv. Powder
           Technol. 27 (2016) 1047–1055]
    • Authors: Ehsan Binaeian; Nasser Seghatoleslami; Mohammad Javad Chaichi; Habib-allah Tayebi
      First page: 1989
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Ehsan Binaeian, Nasser Seghatoleslami, Mohammad Javad Chaichi, Habib-allah Tayebi


      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.05.025
       
  • Soybean oil methanolysis over scallop shell-derived CaO prepared via
           methanol-assisted dry nano-grinding
    • Authors: Frisda R. Panjaitan; Shinya Yamanaka; Yoshikazu Kuga
      Pages: 1627 - 1635
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Frisda R. Panjaitan, Shinya Yamanaka, Yoshikazu Kuga
      Calcium oxides with a specific surface area between 4.5m2 g−1 and 62.5m2 g−1 were obtained by calcination of scallop shells, following by methanol-assisted dry nano-grinding. Three distinct phases are formed on the surface of these catalysts during nano-grinding: calcium methoxide, calcium hydroxide, and calcium oxide. The effects of specific surface area and active surface phase composition on the catalytic activity of calcium oxide during methanolysis of soybean oil were investigated. The properties of the calcium oxide before, during, and after methanol assisted dry nano-grinding were studied by XRD, FTIR, and nitrogen gas adsorption based on the BET method. The ground calcium oxides were found to be effective in catalyzing the methanolysis of soybean oil, with the optimal catalyst producing a 72.3% ester yield after 20mins of reaction. The improvements in rate of reaction were attributed to the rapid formation of calcium diglyceroxide during the initial stages of methanolysis. A combination high specific surface area and effective active phases on the surface of the calcium oxide catalysts is correlated with reductions in mass transfer limitations in the early steps of the reaction, indicated by the rapid formation of calcium diglyceroxide.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2016.12.020
       
  • Physical and optical properties of HfO2 NPs – Synthesis and
           characterization in finding its feasibility in opto-electronic devices
    • Authors: J. Manikantan; H.B. Ramalingam; B. Chandar Shekar; B. Murugan; R. Ranjith Kumar; J. Sai Santhoshi
      Pages: 1636 - 1646
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): J. Manikantan, H.B. Ramalingam, B. Chandar Shekar, B. Murugan, R. Ranjith Kumar, J. Sai Santhoshi
      HfO2 nanoparticles (HfO2 NPs) with different precursors (NaOH, H2O, ethanol) were synthesized by a simple co-precipitation method. FTIR and EDX spectroscopy analysis shows the Stoichiometries composition of HfO2 NPs. X-ray diffraction pattern analysis revealed that the as prepared and calcined HfO2 NPs are respectively amorphous and polycrystalline nature. TEM analysis confirms that the morphology of the calcined HfO2 NPs is spherical in shape with less agglomeration. The crystallite size was evaluated to be 51nm, 37nm and 30nm respectively, for the precursors NaOH, H2O and ethanol used for HfO2 NPs. SEM analysis shows spherical, rock and sponge like surface morphology respectively, for the precursors NaOH, H2O and ethanol used for HfO2 NPs. UV–visible spectroscopy analysis revealed that the optical band gap energy of NaOH, H2O and ethanol precursors used HfO2 NPs were respectively 5.50eV, 5.52eV and 5.50eV. The observed optical properties indicated the feasibility of utilizing these NPs as anti reflection layers in solar cells and for the construction of poultry farms to save energy. The estimated dielectric constant value indicated that these NPs could be used to prepare dielectric layers in thin film transistor.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.03.022
       
  • Size and shape distributions of primary crystallites in titania aggregates
    • Authors: Eric A. Grulke; Kazuhiro Yamamoto; Kazuhiro Kumagai; Ines Häusler; Werner Österle; Erik Ortel; Vasile-Dan Hodoroaba; Scott C. Brown; Christopher Chan; Jiwen Zheng; Kenji Yamamoto; Kouji Yashiki; Nam Woong Song; Young Heon Kim; Aleksandr B. Stefaniak; D. Schwegler-Berry; Victoria A. Coleman; Åsa K. Jämting; Jan Herrmann; Toru Arakawa; Woodrow W. Burchett; Joshua W. Lambert; Arnold J. Stromberg
      Pages: 1647 - 1659
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Eric A. Grulke, Kazuhiro Yamamoto, Kazuhiro Kumagai, Ines Häusler, Werner Österle, Erik Ortel, Vasile-Dan Hodoroaba, Scott C. Brown, Christopher Chan, Jiwen Zheng, Kenji Yamamoto, Kouji Yashiki, Nam Woong Song, Young Heon Kim, Aleksandr B. Stefaniak, D. Schwegler-Berry, Victoria A. Coleman, Åsa K. Jämting, Jan Herrmann, Toru Arakawa, Woodrow W. Burchett, Joshua W. Lambert, Arnold J. Stromberg
      The primary crystallite size of titania powder relates to its properties in a number of applications. Transmission electron microscopy was used in this interlaboratory comparison (ILC) to measure primary crystallite size and shape distributions for a commercial aggregated titania powder. Data of four size descriptors and two shape descriptors were evaluated across nine laboratories. Data repeatability and reproducibility was evaluated by analysis of variance. One-third of the laboratory pairs had similar size descriptor data, but 83% of the pairs had similar aspect ratio data. Scale descriptor distributions were generally unimodal and were well-described by lognormal reference models. Shape descriptor distributions were multi-modal but data visualization plots demonstrated that the Weibull distribution was preferred to the normal distribution. For the equivalent circular diameter size descriptor, measurement uncertainties of the lognormal distribution scale and width parameters were 9.5% and 22%, respectively. For the aspect ratio shape descriptor, the measurement uncertainties of the Weibull distribution scale and width parameters were 7.0% and 26%, respectively. Both measurement uncertainty estimates and data visualizations should be used to analyze size and shape distributions of particles on the nanoscale.
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      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.03.027
       
  • Energy-efficient milling method for woody biomass
    • Authors: Dedy Eka Priyanto; Shunichiro Ueno; Koh Hashida; Hidekazu Kasai
      Pages: 1660 - 1667
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Dedy Eka Priyanto, Shunichiro Ueno, Koh Hashida, Hidekazu Kasai
      Size reduction is essential to utilize biomass in many applications. Production of fine particles from biomass chips is usually performed using milling machines that consume large amount of energy. Steam explosion (SE) is a promising method for reducing the size of biomass using less energy consumption because it utilizes thermal energy. In this study, we focused on the possibility of the SE method to produce fine particles with a size below 1mm from wood chips. Sakura (Prunus spp., hardwood) and Japanese cedar (Cryptomeria japonica, softwood) chips with a size of 5–10mm were used in this study. The effects of SE conditions – such as temperature and residence time – and of the biomass type on the biomass size reduction were investigated in detail. The energy consumption of SE was also calculated and compared with that of the conventional mill. We found that SE is an energy-efficient method for biomass milling.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.04.005
       
  • Numerical analysis of conjugate natural and mixed convection heat transfer
           of nanofluids in a square cavity using the two-phase method
    • Authors: Faroogh Garoosi; Farhad Talebi
      Pages: 1668 - 1695
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Faroogh Garoosi, Farhad Talebi
      In the present study, the problem of conjugate natural and mixed convection of nanofluid in a square cavity containing several pairs of hot and cold cylinders is visualized using non-homogenous two-phase Buongiorno's model. Such configuration is considered as a model of heat exchangers in order to prevent the fluids contained in the pipelines from freezing or condensing. Water-based nanofluids with Cu, Al2O3, and TiO2 nanoparticles at different diameters ( 25 nm ⩽ d p ⩽ 145 nm ) are chosen for investigation. The governing equations together with the specified boundary conditions are solved numerically using the finite volume method based on the SIMPLE algorithm over a wide range of Rayleigh number ( 10 4 ⩽ Ra ⩽ 10 7 ), Richardson number ( 10 - 2 ⩽ Ri ⩽ 10 2 ) and nanoparticle volume fractions ( 0 ⩽ φ ⩽ 5 % ). Furthermore, the effects of three types of influential factors such as: orientation of conductive wall, thermal conductivity ratio ( 0.2 ⩽ K r ⩽ 25 ) and conductive obstacles on the fluid flow and heat transfer rate are also investigated. It is found that the heat transfer rate is significantly enhanced by incrementing Rayleigh number and thermal conductivity ratio. It is also observed that at all Rayleigh numbers, the total Nusselt number rises and then reduces with increasing the nanoparticle volume fractions so that there is an optimal volume fraction of the nanoparticles where the heat transfer rate within the enclosure has a maximum value. Finally, the results reveal that by increasing the thermal conductivity of the nanoparticles and Rayleigh number, distribution of solid particles becomes uniform.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.04.006
       
  • Impact of precursor solution concentration to form superparamagnetic
           MgFe2O4 nanospheres by ultrasonic spray pyrolysis technique for magnetic
           thermotherapy
    • Authors: Harinarayan Das; Nipa Debnath; Atsushi Toda; Takahiko Kawaguchi; Naonori Sakamoto; Hiromichi Aono; Kazuo Shinozaki; Hisao Suzuki; Naoki Wakiya
      Pages: 1696 - 1703
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Harinarayan Das, Nipa Debnath, Atsushi Toda, Takahiko Kawaguchi, Naonori Sakamoto, Hiromichi Aono, Kazuo Shinozaki, Hisao Suzuki, Naoki Wakiya
      The superparamagnetic magnesium ferrite (MgFe2O4) dense nanospheres are synthesized by ultrasonic spray pyrolysis (USP) method from different concentrations of the initial precursor solution. The effect of precursor solution concentration on the particle’s size, morphology, and superparamagnetic behavior has been investigated. XRD results confirm that studied precursor concentration (0.06, 0.12 and 0.24M) exhibited single phase cubic structure. The mean crystallites size (called as primary particles) of 0.06, 0.12 and 0.24M samples are 9.6, 11.5, 11.0nm, respectively but the entire nanosphere’s diameter (called as secondary particles) increases from 206 to 340nm with increasing precursor concentration. TEM analysis also reveals that nanospheres consist of densely aggregated crystallites of spherical shape and smooth surface. The value of polydispersity index (PDI) shows narrower size distribution for lower concentration. Magnetic properties indicate the superparamagnetic nature for all samples. Herein, the appropriate induction heat generation rate with better morphology was obtained for 0.06M concentration. Ion release in the aqueous solution of the composition (about 95% for Mg; 99% for Fe) indicating better stability has been confirmed by ICP-OES test. In this approach, as-synthesized nanospheres are suitable for using as a heating agent in magnetic thermotherapy application.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.04.007
       
  • Simulation of the transport and placement of multi-sized proppant in
           hydraulic fractures using a coupled CFD-DEM approach
    • Authors: Guodong Zhang; Mingzhong Li; Marte Gutierrez
      Pages: 1704 - 1718
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Guodong Zhang, Mingzhong Li, Marte Gutierrez
      The productivity of fractured wells is mainly governed by propped fractures, so it is of significant importance to find out where the injected proppants go during hydraulic fracturing treatments, as this is essential to scheduling proppant injection in fracturing design. Using a coupled CFD-DEM model, the transport and placement of multi-sized proppants in fractures in vertical and horizontal wells were systematically investigated, and the effects of having multi-sized particles relative to uniformly-sized ones on the proppant placement were quantitatively characterized. When a proppant-laden fluid is injected into a fracture in vertical wells, a small proppant bank quickly forms. The injected large and small proppant particles are almost uniformly mixed, with just a small-proppant region at the back side of the bank. In comparison in horizontal wells, a proppant dune first forms near the wellbore in a fracture, and the large proppant particles are more likely to accumulate near the wellbore while the small particles are transported deeper into the fracture. The main transport mechanisms of proppant particles are settlement and fluidization, which cause a three-layer flow pattern (stationary proppant bed, fluidization layer and clean fluid layer) to form. In addition, vortex is also an important proppant transport mechanism, especially in a fracture in horizontal wells, where the vortex drags the injected proppant particles to different locations causing a dual-dune profile. The effect of fracture tip screen-out on the proppant placement was investigated. Screen-out can significantly change the flow field in a fracture and this will subsequently affect final proppant placement. Ultimately, the process of graded proppant injection was realistically modeled, which shows small proppants to be transported deeper into the fracture, while large proppants accumulate near the wellbore.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.04.008
       
  • Dual structure O+B2 for enhancement of hardness in furnace-cooled
           Ti2AlNb-based alloys by powder metallurgy
    • Authors: Mengchen Li; Qi Cai; Yongchang Liu; Zongqing Ma; Zumin Wang; Yuan Huang; Jianxin Yu
      Pages: 1719 - 1726
      Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7
      Author(s): Mengchen Li, Qi Cai, Yongchang Liu, Zongqing Ma, Zumin Wang, Yuan Huang, Jianxin Yu
      Powder metallurgic Ti2AlNb alloys were sintered at 900°C, 990°C, 1060°C, and 1100°C (i.e. in the O+B2, α 2 +B2+O, α 2 +B2, and B2 phase region, respectively) for 12h, followed by water quenching and furnace cooling. Quenching was employed to reserve the high-temperature phase and microstructure, and furnace cooling aimed to regulate the room-temperature microstructure for the enhancement of hardness. Widmanstatten B2+O structure, which contributes to the properties, was induced from B2 crystals by sintering, unless the alloy was treated in the α 2 +B2 phase region. With the elevation of the sintering temperature, the content of α 2 phase became lower in the furnace-cooled alloys, and the hardness was improved accordingly. The highest hardness performance, 389±23HV, was obtained in the alloy solution treated in the single B2 region, and the alloy was comprised of complete O+B2 Widmanstatten structure.
      Graphical abstract image

      PubDate: 2017-06-02T08:22:33Z
      DOI: 10.1016/j.apt.2017.04.009
       
  • Experimental investigation of heat transfer enhancementin helicalcoil heat
           exchangers using water based CuO nanofluid
    • Authors: P.J. Fule; B.A. Bhanvase; S.H. Sonawane
      Abstract: Publication date: Available online 20 June 2017
      Source:Advanced Powder Technology
      Author(s): P.J. Fule, B.A. Bhanvase, S.H. Sonawane
      The present work deals with the study of heat transfer enhancement using water based CuO nanofluids in the helical coil heat exchanger. Nanofluids were prepared using two-step method by using wet chemical method. Nanofluids with various volume percentage between 0 and 0.5 of CuO nanoparticles and their flow rate between 30 and 80 LPH (Reynolds number ranging from 812 to 1895, Laminar flow regime) were considered in the present study. The setup consists of a test section (helical coil), cooler, reservoir, pump, flow meter, thermocouples and flow controlling system. The temperature measurements were carried out with the help of thermocouples. The investigation was carried out to study the effect of particle loading and flow rate on heat transfer coefficient and Nusselt number. It has been found that the increase in the loading of CuO nanoparticles in base fluid shows a significant enhancement in the heat transfer coefficient of nanofluid. In the present study, at 0.1vol% concentration of CuO nanoparticles in nanofluid, enhancement in heat transfer coefficient was 37.3% as compared to base fluid while at 0.5vol%, it is as high as 77.7%. Also with the increase in the flow rate of the CuO nanofluid, significant increase in heat transfer coefficient was observed.
      Graphical abstract image

      PubDate: 2017-06-22T08:39:30Z
      DOI: 10.1016/j.apt.2017.06.010
       
  • Free convection of hybrid Al2O3-Cu water nanofluid in a differentially
           heated porous cavity
    • Authors: S.A.M. Mehryan; Farshad M. Kashkooli; Mohammad Ghalambaz; Ali J. Chamkha
      Abstract: Publication date: Available online 20 June 2017
      Source:Advanced Powder Technology
      Author(s): S.A.M. Mehryan, Farshad M. Kashkooli, Mohammad Ghalambaz, Ali J. Chamkha
      Hybrid nanofluids are a new type of enhanced working fluids, engineered with enhanced thermo-physical properties. The hybrid nanofluids profit from the thermo-physical properties of more than one type of nanoparticles. The present study aims to address the free convective heat transfer of the Al2O3-Cu water hybrid nanofluid in a cavity filled with a porous medium. Two types of important porous media, glass ball and aluminum metal foam, are considered for the porous matrix. The experimental data show dramatic enhancement in the thermal conductivity and dynamic viscosity of the synthesized hybrid nanofluids, and hence, these thermophysical properties could not be modeled using available models of nanofluids. Thus, the actual available experimental data for the thermal conductivity and the dynamic viscosity of hybrid nanofluids are directly utilized in the present theoretical study. Various comparison with results published previously in the literature are performed and the results are found to be in excellent agreement. In most cases, the average Nusselt number Nul is decreasing function of the volume fraction of nanoparticles. The results show the reduction of heat transfer using nanoparticles in porous media. The observed reduction of the heat transfer rate is much higher for hybrid nanofluid compared to the single nanofluid.
      Graphical abstract image

      PubDate: 2017-06-22T08:39:30Z
      DOI: 10.1016/j.apt.2017.06.011
       
  • Ag/TiO2/bentonite nanocomposite for biological applications: Synthesis,
           characterization, antibacterial and cytotoxic investigations
    • Authors: K. Bama; M. Sundrarajan
      Abstract: Publication date: Available online 19 June 2017
      Source:Advanced Powder Technology
      Author(s): K. Bama, M. Sundrarajan
      Bentonite (bent) clay supported silver (Ag)/titanium dioxide (TiO2) nanocomposite material was green synthesized by facile thermal decomposition method in the absence of reducing and precipitating agents. The samples were characterized by XRD, BET, HR-SEM with EDX mapping, TEM with SAED patterns, XPS, PSA, FT-IR, and UV–Vis DRS. XRD and EDX spectra showed peaks of Ag and TiO2, confirming the formation of the Ag/TiO2 nanoparticles in the composite. TEM revealed the uniform distribution of Ag/TiO2 nanoparticles cluster on the surface of the bent with an average size of ∼5 to 50nm. The antibacterial activities of Na-bent, Ag, TiO2, and Ag/TiO2/bent nanocomposite samples were tested against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) bacteria by the well diffusion method. Furthermore, the cytotoxicity of Ag/TiO2/bent nanocomposite material was determined by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay. Also, the succinate-dehydrogenase release showed the nontoxic nature of the nanocomposite at low concentrations. The cytotoxicity results of samples were evaluated using human embryonic kidney cell line (HEK 293) and have given excellent biocompatibility and cell proliferation in the in vitro studies.
      Graphical abstract image

      PubDate: 2017-06-22T08:39:30Z
      DOI: 10.1016/j.apt.2017.06.007
       
  • Investigation of Ti coatings on cubic boron nitride (cBN) grits by
           discharge treatment in spark plasma sintering system
    • Authors: Rui Chang; Yanhui Wang; Jianbing Zang; Yiqing Yu; Jing Lu; Xipeng Xu
      Abstract: Publication date: Available online 19 June 2017
      Source:Advanced Powder Technology
      Author(s): Rui Chang, Yanhui Wang, Jianbing Zang, Yiqing Yu, Jing Lu, Xipeng Xu
      The Ti coatings on cubic boron nitride (cBN) grits were prepared by discharge treatment on a mixture of Ti powders and cBN grits in spark plasma sintering system. The uniform and full coatings with a thickness of ∼1.2μm were prepared at 850°C for 60min, which were constituted with TiB2, TiN, and Ti phases. The compressive fracture strength and toughness impact of the Ti-coated cBN grits were 11.6% and 7.4% higher than the cases of the pristine ones, respectively. With the aid of Ti coatings, the interface bonding strength between cBN grits and Fe-based matrix was improved by 335MPa in the Fe-based matrix/cBN composites.
      Graphical abstract image

      PubDate: 2017-06-22T08:39:30Z
      DOI: 10.1016/j.apt.2017.06.008
       
  • Compartmental residence time estimation in batch granulators using a
           colourimetric image analysis algorithm and Discrete Element Modelling
    • Authors: Andrew D. McGuire; Kok Foong Lee; Maksym Dosta; Sebastian Mosbach; Jan-Georg Rosenboom; Stefan Heinrich; Markus Kraft
      Abstract: Publication date: Available online 16 June 2017
      Source:Advanced Powder Technology
      Author(s): Andrew D. McGuire, Kok Foong Lee, Maksym Dosta, Sebastian Mosbach, Jan-Georg Rosenboom, Stefan Heinrich, Markus Kraft
      In this paper we present an experimental technique and a novel colourimetric image analysis algorithm to economically evaluate particle residence times within regions of batch granulators for use in compartmental population balance models. Residence times are extracted using a simple mixing model in conjunction with colourimetric data. The technique is applied to the mixing of wet coloured granules (binary and ternary systems) in a laboratory scale mixer. The resulting particle concentration evolutions were in qualitative agreement with those from the mixing model. It was seen that the algorithm was most stable in the case of the binary colour experiments. Lastly, simulations using the Discrete Element Method (DEM) were also performed to further validate the assumptions made in the analysis of the experimental results. Particle concentrations from the simulations showed the same trends as the experiment and highlighted the importance of particle size distributions on the DEM residence times.
      Graphical abstract image

      PubDate: 2017-06-17T08:35:08Z
      DOI: 10.1016/j.apt.2017.06.005
       
  • Morphological and phase evaluation of Al/15wt.% BN nanocomposite
           synthesized by planetary ball mill and sintering
    • Authors: Reza Gostariani; Mohsen Asadi Asadabad; Mohammad Hossein Paydar; Ramin Ebrahimi
      Abstract: Publication date: Available online 15 June 2017
      Source:Advanced Powder Technology
      Author(s): Reza Gostariani, Mohsen Asadi Asadabad, Mohammad Hossein Paydar, Ramin Ebrahimi
      In this study, Al/15wt.% BN nanocomposite was fabricated by high energy ball milling, cold compaction, and sintering process. Then the effect of milling process on the morphology change and phase evaluation was studied. The Aluminum (45µm) and hexagonal boron nitride (70nm) powders were milled using planetary ball mill under a pure argon atmosphere for various times of 75, 150, 300 and 600min. The as-milled powders were consolidated at 400MPa pressure and sintered at 600°C for 60min. The morphology change evaluation studied by using scanning electron microscopy (SEM) showed that the equiaxed composite powders were obtained after a short time milling process of 150min. The steady state condition between welding and fracturing occurred by continuous milling up to 600min. The results of X-ray diffraction patterns and differential scanning calorimetric (DSC) revealed that the BN particles completely decomposed to boron and nitrogen and dissolved in the Al matrix after 300min of ball milling and the AlN and AlB2 as in-situ phases were formed after sintering at temperatures above 580°C.
      Graphical abstract image

      PubDate: 2017-06-17T08:35:08Z
      DOI: 10.1016/j.apt.2017.06.004
       
  • A facile sol-gel method for the fabrication of nitrogen doped
           TiO2/NiFe2O4/diatomite composite with enhanced photoactivity
    • Authors: Yan Chen; Kuiren Liu
      Abstract: Publication date: Available online 15 June 2017
      Source:Advanced Powder Technology
      Author(s): Yan Chen, Kuiren Liu
      N doped TiO2/NiFe2O4/diatomite (NND) photocatalytic composite was fabricated via a facile two-step sol-gel method. Its crystal structure, morphology, specific surface area, pore size distribution and magnetic property were systematically characterized and analyzed. The photoactivity of NND was investigated via the degradation of Rhodamine B (RhB) solution under visible light irradiation. NND achieved high photodegradation efficiency due to the synergy between adsorption of diatomite (Dt) and degradation of TiO2, as well as the synergy between TiO2 and NiFe2O4. NND could be simply separated from aquatic environment using an external magnet, due to the ferromagnetism of NiFe2O4. We consider that NND is applicable for wastewater treatment.
      Graphical abstract image

      PubDate: 2017-06-17T08:35:08Z
      DOI: 10.1016/j.apt.2017.06.003
       
  • Effect of high-pressure torsion processing on the microstructure evolution
           and mechanical properties of consolidated micro size Cu and Cu-SiC powders
           
    • Authors: Mohamed Ibrahim Abd El Aal
      Abstract: Publication date: Available online 15 June 2017
      Source:Advanced Powder Technology
      Author(s): Mohamed Ibrahim Abd El Aal
      In this paper, micro size Cu and Cu-SiC composites powders were consolidated by powder metallurgy (PM) followed by sintering or high-pressure torsion (HPT) to study the effect of the different processing methods on microstructure evolution and mechanical properties. HPT contributes in producing fully dense samples with a relative density higher than those processed by PM followed by sintering. Bimodal and trimodal microstructures with a mixture of ultrafine grain (UFG) and micro or nano grain sizes were noted in the case of Cu and Cu-SiC HPTed samples, respectively. The increase of the SiC volume fraction (SiC%) produces smaller grain size with higher fractions of high angle grain boundaries (HAGBs) in the HPTed Cu-SiC samples than that in the case of HPTed Cu sample. The HPT under a pressure of 10GPa and 15 revolutions was effective to achieve a complete fragmentation of SiC particles down to ultrafine particle size. HPT processing of Cu and Cu-SiC composites enhanced the mechanical properties (hardness and tensile strength) with conserving a reasonable degree of ductility (elongation%). The yield strength of the samples was estimated based on the microstructure observations and processing parameters by different models correctly with an error range of 5.1–1% from the experiential results.
      Graphical abstract image

      PubDate: 2017-06-17T08:35:08Z
      DOI: 10.1016/j.apt.2017.05.020
       
  • Inside Front Cover (Aims &amp; Scope, Editors)
    • Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8


      PubDate: 2017-06-12T08:30:57Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8


      PubDate: 2017-06-12T08:30:57Z
       
  • Heat effect of the oxygen-containing functional groups in coal during
           spontaneous combustion processes
    • Authors: Tao
      Abstract: Publication date: August 2017
      Source:Advanced Powder Technology, Volume 28, Issue 8
      Author(s): Tao Xu
      The heat generated from the reactions of oxygen-containing functional groups in coal has been studied using organic chemistry and quantum chemistry analysis methods. Structural models of the oxygen-containing functional groups in coal were established and used to analyze the reactions of these groups during spontaneous combustion. The Gibbs free energy and enthalpy changes associated with these reactions were determined using quantum mechanical analysis, and the results indicated that the dehydration and dehydrogenation reactions of the hydroxyl groups in coal were only mildly exothermic, whereas reactions involving the oxidation of the carbonyl groups were much more exothermic. In contrast, reactions resulting in the generation of carbon monoxide were endothermic. By comparing the heat release characteristics of the reactions of the oxygen-containing functional groups with the levels of oxygen consumption and gas production, as well as temperature profiles of the reactions, it was concluded that the decomposition of oxygen-containing functional groups is critical to the production of heat during the initial stages of the spontaneous combustion of coal and that oxidation does not occur during this period. These results also explain why the temperature of coal rises slowly during the initial stages of its spontaneous combustion.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
       
  • Investigation of wear behaviours of Al matrix composites reinforced with
           different B4C rate produced by powder metallurgy method
    • Authors: Yahya
      Abstract: Publication date: Available online 10 June 2017
      Source:Advanced Powder Technology
      Author(s): Yahya Hışman Çelik, Kübra Seçilmiş
      In this study, the effects of wear behaviours of Al matrix composites reinforced with different B4C rate produced by powder metallurgy method were investigated. Al and B4C powders with purity of 99.9% and sizes of 25–44µm were prepared as pure Al, 4% B4C/Al, 8% B4C/Al, 12% B4C/Al and 16% B4C/Al. After these prepared mixtures were pressed under 350MPa, they were sintered for 90min at 580°C in atmospheric environment. Microhardness and wear tests of the produced samples were carried out. Wear experiments of these composites were performed with specially manufactured test equipment at different application loads (5N, 10N and 15N), different sliding distances (250m, 500m, 750m and 1000m) and a constant speed of 0.46m/s. In addition, optical microscope, SEM, EDS analyses were used to determine the microstructural changes in the worn and unworn surface of the manufactured composite materials. The results of experimental studies show that the increasing the B4C reinforced rate in composites with Al matrix has led to increase of the hardness and to reduce of the wear loss.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
       
  • Theoretical investigation on heat transfer to burning char of spheroidal
           particles
    • Authors: Jie Li; Jian Zhang
      Abstract: Publication date: Available online 10 June 2017
      Source:Advanced Powder Technology
      Author(s): Jie Li, Jian Zhang
      The combustion of biomass fuel provides efficient and inexpensive utilization of solid biomass. Biomass particles generally exhibit non-spherical shapes, which affect the heat and mass transfer and further the char surface reactions. The prolate and oblate spheroidal particles are considered presently. The energy balance is employed for the gas phase near the particle in spheroidal coordinate system. A theoretical study is conducted on the char combustion of the spheroidal particles under either static conditions or forced convection. The expressions for the Nusselt numbers of both prolate and oblate spheroids are obtained. The char combustion rates for the spheroidal particles are affected by the Nusselt number and the particle surface area.
      Graphical abstract image

      PubDate: 2017-06-12T08:30:57Z
      DOI: 10.1016/j.apt.2017.06.001
       
  • Inside Front Cover (Aims &amp; Scope, Editors)
    • Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7


      PubDate: 2017-06-02T08:22:33Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: July 2017
      Source:Advanced Powder Technology, Volume 28, Issue 7


      PubDate: 2017-06-02T08:22:33Z
       
  • A temperature programmed desorption study of non-thermal plasma modified
           γ-Al2O3
    • Authors: Samuel W. Vierck; Corey A. Leclerc
      Abstract: Publication date: Available online 9 May 2017
      Source:Advanced Powder Technology
      Author(s): Samuel W. Vierck, Corey A. Leclerc
      In this paper, the effect of non-thermal RF plasma modification on the point of zero charge (PZC) of γ-Al2O3 has been explored. Samples of alumina were first modified with air, CO2, N2 or Ar plasma and then measurements of the PZC were taken. In order to determine the mechanism behind PZC shift, the surface area and crystal phase were measured for each sample using nitrogen physisorption (BET) and X-ray diffraction (XRD). Additionally, the presence of plasma gas on the surface of alumina was determined qualitatively using a modified temperature programmed desorption (TPD) technique. Air and CO2 modification of alumina powder decreased the PZC from 7.48 to 4.86 and 6.57 respectively. However, N2 and Ar modification did not result in any PZC shift. BET and XRD measurements showed no significant surface area or phase changes occurred due to non-thermal plasma modification. TPD profiles for air and CO2 modified samples showed new peaks corresponding to the adsorption of plasma ions on the alumina surface. These results demonstrate that PZC changes in a support after plasma treatment is caused by the adsorption of plasma species.
      Graphical abstract image

      PubDate: 2017-05-13T08:04:10Z
      DOI: 10.1016/j.apt.2017.04.020
       
  • Investigation of MHD Go-water nanofluid flow and heat transfer in a porous
           channel in the presence of thermal radiation effect
    • Authors: A.S. Dogonchi; M. Alizadeh; D.D. Ganji
      Abstract: Publication date: Available online 9 May 2017
      Source:Advanced Powder Technology
      Author(s): A.S. Dogonchi, M. Alizadeh, D.D. Ganji
      In this paper, flow and heat transfer of MHD Go-water nanofluid between two parallel flat plates in the presence of thermal radiation are studied. One of plates is externally heated and cooled by coolant injection through the other plate, which also expands or contracts with time. A similarity transformation is used to transmute the governing momentum and energy equations into non-linear ordinary differential equations with the appropriate boundary conditions. The obtained non-linear ordinary differential equations are solved by Duan–Rach Approach (DRA). This method allows us to find a solution without using numerical methods to evaluate the undetermined coefficients. This method modifies the standard Adomian Decomposition Method by evaluating the inverse operators at the boundary conditions directly. The impacts of various parameters such as the Reynolds number, the expansion ratio, the magnetic parameter, the power law index, the solid volume fraction and the radiation parameter are investigated on the velocity and temperature. Furthermore, the value of the Nusselt number is calculated and presented through figures. The results indicate that the temperature profile and the Nusselt number have a direct relationship with the solid volume fraction and have an inverse relationship with the radiation parameter. In addition, the limiting cases are gained and found to be in an excellent agreement with the previous works.
      Graphical abstract image

      PubDate: 2017-05-13T08:04:10Z
      DOI: 10.1016/j.apt.2017.04.022
       
  • Extending LaMer's mechanism using open system for increasing forced and
           controlled growth of Au nano particles: Desired decreasing Fe3O4 nano
           particles size during simultaneous synthesis in optimized conditions
    • Authors: Roohan Rakhshaee; Yasaman Noorani
      Abstract: Publication date: Available online 9 May 2017
      Source:Advanced Powder Technology
      Author(s): Roohan Rakhshaee, Yasaman Noorani
      The most effective parameters were found to obtain Au/Fe3O4 nano particles (NPs)-oleylamine composite. Having Au NPs with the controlled maximum mean size under the forced conditions was the main aim of this study. We used the continuous flow rates of oleylamine 75% to produce Au NPs under an open system by extended LaMer mechanisms. This process decreased the mean size of Fe3O4 NPs synthesized simultaneously, by classic LaMer mechanism. The Fe3O4 NPs production was carried out without continuous adding of any iron reactant, viz. as a closed system. In the absence of gold ions, the mean size of the synthesized Fe3O4 NPs using 2.5ml/min oleylamine was about 35.0nm at 2.0±0.5 °C after 120min. This mean size was decreased to 27.2, 21.4, 16.8 and 8.7nm, when Au NPs were simultaneous prepared using 0.5, 0.75, 1.5 and 2.5ml/min of oleylamine, respectively, at the same conditions. Surface Plasmon Resonance (SPR) adsorption was used to evaluate Au NPs production at first 30min, while Small Angle X-ray Scattering (SAXS) method was used to monitor the reaction progression for near-real time analysis of increasing the growth of Au NPs up to 280min, at the optimum conditions. Changing the properties of Fe3O4 NPs during processes was determined by studying Magnetization, Potentiometric titration, Inductive heating and Zeta potential.
      Graphical abstract image

      PubDate: 2017-05-13T08:04:10Z
      DOI: 10.1016/j.apt.2017.04.021
       
  • Effects of radial air flow quantity and location of an air curtain
           generator on dust pollution control at fully mechanized working face
    • Authors: Hao Wang; Weimin Cheng; Biao Sun; Youying Ma
      Abstract: Publication date: Available online 9 May 2017
      Source:Advanced Powder Technology
      Author(s): Hao Wang, Weimin Cheng, Biao Sun, Youying Ma
      To better understand the effects of radial air flow quantity and the location of air curtain generator on dust pollution control, the 2–1092 fully mechanized working face in Xinzhi coal mine (Huozhou Coal Electricity Group Co., Ltd., Shanxi, China) was numerically simulated in the present study. A full-scale physical model of the working face was established; then, based on airflow-dust particle two-phase flowing characteristics, the k-ε-Θ-kp mathematical model was constructed. The comparison between simulation results and field measurements validated the model and the parameter settings. Furthermore, the effects of ventilation parameters on airflow migration and dust diffusion were numerically investigated using FLUENT. The results show that the increase of the radial air flow quantity (denoted as φ) and the distance of the air curtain generator from working face (denoted as dw ) is beneficial to the formation of a dust-control air curtain. At a constant dw , the dust diffusion distance (denoted as D) decreases with the increase of φ. At a constant φ, D decreases with the increase of dw when a dust-control air curtain is formed; otherwise, the increase of dw leads to the increase of D. By analyzing the simulation results, the optimal ventilation parameters for 2–1092 fully mechanized working face and those working faces under similar production conditions are determined as: φ =240–270m3/min and dw =20–30m.
      Graphical abstract image

      PubDate: 2017-05-13T08:04:10Z
      DOI: 10.1016/j.apt.2017.04.019
       
  • MOF-derived magnetic porous carbon-based sorbent: Synthesis,
           characterization, and adsorption behavior of organic micropollutants
    • Authors: Dezhi Chen; Caiqin Chen; Weisong Shen; Hongying Quan; Shasha Chen; Shasha Xie; Xubiao Luo; Lin Guo
      Abstract: Publication date: Available online 6 May 2017
      Source:Advanced Powder Technology
      Author(s): Dezhi Chen, Caiqin Chen, Weisong Shen, Hongying Quan, Shasha Chen, Shasha Xie, Xubiao Luo, Lin Guo
      Magnetic porous carbon-based sorbent (MPCS) with core-shell structure was prepared from the pyrolysis of FeIII-modified MOF-5. The component, structure and surface properties of the as-obtained sorbent were investigated by Raman spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Sorption behaviors of five organic micropollutants (OMPs), such as atrazine, carbamazepine, bisphenol A, norfloxacin and 4-nitrophenol, onto the magnetic porous MPCS were studied in a batch system. The adsorption capacities of the five OMPs onto MPCS followed the order of 4-nitrophenol>norfloxacin>bisphenol A>carbamazepine>atrazine. All isotherms were fitted well by the Dubinin-Ashtakhov (DA) model, and the approximate site energy distributions were acquired. The possible adsorption mechanisms of the five OMPs onto as-prepared MPCS were discussed in detail. This study will aid in further understanding of interactions between the OMPs and MOF-derived carbon-based materials.
      Graphical abstract image

      PubDate: 2017-05-08T07:56:16Z
      DOI: 10.1016/j.apt.2017.04.018
       
  • Discrete element modeling and experimental investigation of hot pressing
           of intermetallic NiAl powder
    • Authors: Szymon Nosewicz; Jerzy Rojek; Marcin Chmielewski; Katarzyna Pietrzak
      Abstract: Publication date: Available online 4 May 2017
      Source:Advanced Powder Technology
      Author(s): Szymon Nosewicz, Jerzy Rojek, Marcin Chmielewski, Katarzyna Pietrzak
      This paper presents the numerical and experimental analysis of hot pressing of NiAl powder with an emphasis on the best possible representation of its main stages: initial powder compaction and pressure-assisted sintering. The numerical study has been performed within the discrete element framework. In the paper, an original viscoelastic model of hot pressing has been used. In order to ensure that the applied values of material parameters in numerical simulations are appropriate, the reference literature has been reviewed. It produced the relations and equations to estimate the values of all required sintering material parameters of the considered viscoelastic model. Numerical simulations have employed the geometrical model of the initial dense specimen generated by a special algorithm which uses the real grain distribution of powder. The numerical model has been calibrated and validated through simulations of the real process of hot pressing of intermetallic NiAl material. The kinetics of compaction, sintering and cooling stage indicated by the evolution of density, shrinkage and densification rate have been studied. The comparison of numerical and experimental results has shown a good performance of the developed numerical model.
      Graphical abstract image

      PubDate: 2017-05-08T07:56:16Z
      DOI: 10.1016/j.apt.2017.04.012
       
  • Synthesis of nanometric MoNbW alloy using self-propagating
           high-temperature synthesis
    • Authors: Sarah Dine; Vasuki Kentheswaran; Dominique Vrel; Jean-Philippe Couzinié; Guy Dirras
      Abstract: Publication date: Available online 4 May 2017
      Source:Advanced Powder Technology
      Author(s): Sarah Dine, Vasuki Kentheswaran, Dominique Vrel, Jean-Philippe Couzinié, Guy Dirras
      Nanometric powders of stoichiometric compositions in the Mo-Nb-W ternary system were produced by Self-propagating High-temperature Synthesis (SHS) using magnesium to reduce their oxides, in presence of sodium chloride. The influence of Mg and adiabatic temperature on the phase compositions of the final products were determined. After reaction, samples were analyzed by XRD, SEM, and BET. Results demonstrate the possibility to obtain high purity nanostructured products in the 20–800nm range, with an average equivalent diameter, from specific surface measurements, of 66nm. For moderate excess Mg amounts, due to the low Mg boiling temperature, niobium is not completely reduced and forms complex compounds with MgO, whereas reduction is near-complete for the highest Mg amounts.
      Graphical abstract image

      PubDate: 2017-05-08T07:56:16Z
      DOI: 10.1016/j.apt.2017.04.011
       
  • An investigation on the effect of sintering mode on various properties of
           copper-graphene metal matrix composite
    • Authors: C. Ayyappadas; A. Muthuchamy; A. Raja Annamalai; Dinesh K. Agrawal
      Abstract: Publication date: Available online 3 May 2017
      Source:Advanced Powder Technology
      Author(s): C. Ayyappadas, A. Muthuchamy, A. Raja Annamalai, Dinesh K. Agrawal
      The present work investigates the effect of sintering mode and graphene addition on the microstructural, mechanical and electrical properties of copper–graphene metal matrix composites reinforced with varying amounts (0.9, 1.8, 2.7 and 3.6 vol%) of graphene particles fabricated through powder metallurgy route. Sintering was carried out at 900°C in 95%N2-5%H2 (forming gas) atmosphere with a heating rate of 5°/min for conventional and 20°C/min for microwave with a holding time of 60min in both cases. All the composites were found to couple well with microwave field and had resulted in 63% reduction in the processing cycle time as compared to the conventional process. Micro-structural analysis revealed the homogeneous distribution of graphene in copper matrix. Copper-graphene composites exhibited excellent wear resistance due to higher hardness and excellent lubricating nature of graphene. It was observed that porosity has a significant effect on the electrical conductivity values.
      Graphical abstract image

      PubDate: 2017-05-08T07:56:16Z
      DOI: 10.1016/j.apt.2017.04.013
       
  • MHD slip flow and heat transfer of Al2O3-water nanofluid over a horizontal
           shrinking cylinder using Buongiorno’s model: Effect of nanolayer and
           nanoparticle diameter
    • Authors: Puneet Rana; Ruchika Dhanai; Lokendra Kumar
      Abstract: Publication date: Available online 2 May 2017
      Source:Advanced Powder Technology
      Author(s): Puneet Rana, Ruchika Dhanai, Lokendra Kumar
      This paper considers the study of electrically conducting alumina-water based nanofluid flow induced by horizontal shrinking cylinder under the effect of velocity and thermal slip at the surface. The Buongiorno’s non-homogenous model is implemented which accounted with the nanolayer based effective thermal conductivity and Nielsen’s effective viscosity model. The governing transport model for nanofluid has been transformed into a set of nonlinear similarity equations and solved with a shooting technique using MATLAB ode solver and ‘fsolve’ command. The behavior of skin friction, velocity, Nusselt number and temperature are investigated numerically. The increasing trends of Nusselt number as well as skin friction are noticed as nanoparticle concentration increases at the outer surface of the boundary layer. Nusselt number is found to be decreasing nonlinearly with nanoparticle diameter ranging from 5nm to 60nm. Two branches of solution are also captured in some fixed range of involving parameter, namely mass transfer (suction), curvature and shrinking parameters. The physical existence of these branches is also discussed.
      Graphical abstract image

      PubDate: 2017-05-08T07:56:16Z
      DOI: 10.1016/j.apt.2017.04.010
       
 
 
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