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Publisher: Elsevier   (Total: 3043 journals)

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Showing 1 - 200 of 3043 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 22, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 21, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 84, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 25, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 30, 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: 348, 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   (Followers: 1)
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: 252, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 10, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (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: 23, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 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: 4)
Acute Pain     Full-text available via subscription   (Followers: 13)
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: 21)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 135, 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: 17, 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: 25, 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: 11, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 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: 26, 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: 9, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 29, 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 Dermatology     Full-text available via subscription   (Followers: 12)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 6)
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: 41, 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: 41, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 50, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
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: 11)
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: 22, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 0.497, h-index: 31)
Advances in 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: 35, 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: 6)
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: 15, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 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: 24, 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: 8, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 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: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 61)
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: 3, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 353, 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: 7, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 30, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 17)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 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: 326, 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: 5, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 8, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 405, 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: 39, 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: 54, 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: 10, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 8)
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: 4, SJR: 0.776, h-index: 35)
Alpha Omegan     Full-text available via subscription   (SJR: 0.121, h-index: 9)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 8, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 47, 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: 4)
American Heart J.     Hybrid Journal   (Followers: 49, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 47, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 39, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 8, 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: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 25, 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: 45, 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: 249, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 57, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 5)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 26, 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: 34, 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: 57, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 11)
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: 3, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 37, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 167, 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: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 160, 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   (Followers: 1, 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]   [17 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0921-8831 - ISSN (Online) 1568-5527
   Published by Elsevier Homepage  [3043 journals]
  • Scalable production of calcite nanocrystals by atomization process:
           Synthesis, characterization and biological interactions study
    • Authors: Viviana Vergaro; Elisabetta Carata; Francesca Baldassarre; Elisa Panzarini; Luciana Dini; Claudia Carlucci; Stefano Leporatti; Barbara Federica Scremin; Davide Altamura; Cinzia Giannini; Francesco Paolo Fanizzi; Giuseppe Ciccarella
      Pages: 2445 - 2455
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Viviana Vergaro, Elisabetta Carata, Francesca Baldassarre, Elisa Panzarini, Luciana Dini, Claudia Carlucci, Stefano Leporatti, Barbara Federica Scremin, Davide Altamura, Cinzia Giannini, Francesco Paolo Fanizzi, Giuseppe Ciccarella
      Nowadays, there is strong interest in the development of smart inorganic nanostructured materials as tools for targeted delivery in cancer cells. We proposed a novel synthetic procedure of calcium carbonate nanocrystals (NCs) and their use as drug delivery systems, studying the physical chemical properties and the in vitro interaction with two model cancer cells. Pure and thermodynamically stable CaCO3 NCs in calcite phase were synthesized by a readily and feasible method, easily scalable, that allows the control of NCs shape and size without any surfactant use. CaCO3 NCs were extensively investigated by Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS), X-ray Diffraction (XRD), Raman spectroscopy and Brunauer–Emmett–Teller analysis (BET). To deeper investigate their possible use as nanovectors for drug cancer therapies, CaCO3 NCs biocompatibility (by MTT assay), cell interaction and internalization were studied in in vitro experiments on HeLa and MCF7 cell lines. Confocal and transmission electron microscopies were used to monitor and evaluate NCs-cell interaction and cellular uptake. Data here reported demonstrated that synthesized NCs readily penetrate HeLa and MCF7 cells. NCs preferentially localize inside the cytoplasm, but were also found into mitochondria, nucleus and lysosomes. This study suggests that synthesized CaCO3 NCs are good candidates as effective intracellular therapeutic delivery system.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2016.12.018
       
  • An investigation on process of seeded granulation in a continuous drum
           granulator using DEM
    • Authors: Mohammadreza Alizadeh Behjani; Nejat Rahmanian; Nur Fardina bt Abdul Ghani; Ali Hassanpour
      Pages: 2456 - 2464
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Mohammadreza Alizadeh Behjani, Nejat Rahmanian, Nur Fardina bt Abdul Ghani, Ali Hassanpour
      Numerical simulation of wet granulation in a continuous granulator is carried out using Discrete Element Method (DEM) to discover the possibility of formation of seeded granules in a continuous process with the aim of reducing number of experimental trials and means of process control. Simple and scooped drum granulators are utilized to attain homogenous seeded granules in which the effects of drum rotational speed, particles surface energy, and particles size ratio are investigated. To reduce the simulation time a scale-up scheme is designed in which a dimensionless number (Cohesion number) is defined based on the work of cohesion and gravitational potential energy of the particles. Also a mathematical/numerical method along with a MATLAB code is developed by which the percentage of surface coverage of each granule is predicted precisely. The results show that use of continuous granulator for seeded granulation is promising provided that a high level of shear is considered in the granulator design, i.e. using baffles inside drum granulators is essential for producing seeded granules. It is observed that the optimum surface energy for seeded granulation in scooped granulator (used in this study) with rotational speed of 50 rpm is 3J/m2, which is close to the value predicted by the concept of Cohesion number. It is also shown that increasing the seed/fine size ratio enhances the seeded granulation both quantitatively (60% increase in seeds surface coverage) and qualitatively (more homogeneous granules).
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.02.011
       
  • An investigation of the hydrodynamic similarity of single-spout fluidized
           beds using CFD-DEM simulations
    • Authors: Mohammadreza Ebrahimi; Eva Siegmann; Doris Prieling; Benjamin J. Glasser; Johannes G. Khinast
      Pages: 2465 - 2481
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Mohammadreza Ebrahimi, Eva Siegmann, Doris Prieling, Benjamin J. Glasser, Johannes G. Khinast
      The applicability of the hydrodynamic similarity criteria (scaling law) introduced by Glicksman (1988) was investigated using fully coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) simulations for single-spout fluidized beds. Four test cases were performed to investigate the scaling law in a pseudo-2D spouted-fluidized bed. In addition, the applicability of Glicksman’s scaling law for simulating 3D fluidized beds was studied. In all simulations, characteristic dimensionless groups, i.e. the Reynolds number (Re), Froude number (Fr), particle-to-fluid density, bed initial height to particle diameter and bed width to particle diameter were kept constant for the both base and scaled cases. Comparing the time averaged particle velocities, gas velocities and volume fractions between the base and scaled cases indicated a very good overall hydrodynamic similarity for all test cases. A minor discrepancy observed between the simulation results of the base and scaled cases was explained by a force analysis. An advantage of the scaling approach, i.e., reducing computational time, was also presented in the last four test cases, including a large-scale simulation, showing that this approach can be considered as a promising way to simulate large-scale spouted-fluidized beds.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.05.009
       
  • LIGGGHTS and EDEM application on charging system of ironmaking blast
           furnace
    • Authors: Han Wei; Yanhong Zhao; Jian Zhang; Henrik Saxén; Yaowei Yu
      Pages: 2482 - 2487
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Han Wei, Yanhong Zhao, Jian Zhang, Henrik Saxén, Yaowei Yu
      Chemical reactions between gas and raw material are determined by burden distribution, especially radial distribution of pellet/sinter and coke in blast furnace. An appropriate control of burden distribution is required to yield a smooth operation with effective performance and an appropriate gas flow at the wall. This paper studies two different DEM packages application for charing system of ironmaking blast furnace. The simulations (EDEM 2.2.1 and LIGGGHTS 3.4.0) based on the discrete element method (DEM), are validated using mass fraction distribution in the trajectory of pellet flow and burden distributions of pellet on a horizontal plane. The results show that good agreements are found among EDEM, experiment and LIGGGHTS. Furthermore, reducing shear modulus of material can increase calculation speed of DEM.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.05.012
       
  • Effect of steric hindrance on surface wettability of fine silica powder
           modified by n- or t-butyl alcohol
    • Authors: Aki Kawamura; Shoichi Ueno; Chika Takai; Takashi Takei; Hadi Razavi-Khosroshahi; Masayoshi Fuji
      Pages: 2488 - 2495
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Aki Kawamura, Shoichi Ueno, Chika Takai, Takashi Takei, Hadi Razavi-Khosroshahi, Masayoshi Fuji
      Fumed silica is an important industrial material, which is widely used in medical, cosmetic, and electronic products. One important industrial application of the fumed silica powder is using it as fillers, which are key materials for reinforcing the high-performance/high-functional industrial products. However, the use of fumed silica as filler is limited to micrometer or millimeter sized particles, because nanometer sized silica particles tend to aggregate. In this study, the surface of fine silica powder is modified with n- and t-butyl alcohols, which exhibit different steric hindrance effects. The surface wettability of each modified silica powders is determined in two ways: macroscopic and microscopic wettability. Macroscopic wettability refers to preference dispersion test and microscopic wettability refers to evaluation of the molecular level by Fourier transform infrared spectroscopy (FT-IR). The modification ratio of each sample is confirmed by thermogravimetry-differential thermal analysis (TG-DTA), and the hydrophobicity of these modified silica powders is evaluated by the preference dispersion test. Molecular level evaluation of surface wettability by FT-IR confirms an obvious structural difference due to the steric hindrance of the n- and t-butoxy groups on the surface of silica. In addition, a correlation between macroscopic and microscopic evaluation results for the surface wettability of modified silica powders is confirmed.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.06.009
       
  • A simple method to ameliorate hierarchical porous structures of SiO2
           xerogels through adjusting water contents
    • Authors: Si-Yuan Sun; Yi-Yao Ge; Zhao-Bo Tian; Jie Zhang; Zhi-peng Xie
      Pages: 2496 - 2502
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Si-Yuan Sun, Yi-Yao Ge, Zhao-Bo Tian, Jie Zhang, Zhi-peng Xie
      In this contribution, hierarchical micro-/meso-porous SiO2 xerogels were successfully prepared through a Stöber methodology coupled with following drying process. The SiO2 xerogels were consisted of nanoparticles of 20–40nm in size with different contents of water. Fourier transform infrared spectroscopy proved that SiOC2H5 and SiOH groups could be formed in SiO2 xerogels. Further analyses declared that the amount of the SiOC2H5 groups decreased while the concentration of SiOH was firstly increased and then suffered a decline with improving contents of water. Besides, the SiO2 xerogels was endowed with controllable micro-/meso-porous structure. Furthermore, the formation mechanism of the micro-/meso-porous SiO2 xerogels was tentatively put forward. As a consequence, SiO2 xerogels with controllable hierarchical micro-/meso-porous structure could act as the smart material for huge development in catalytic fields.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.06.019
       
  • Powder reduction kinetics of dicalcium ferrite, calcium ferrite, and
           hematite: Measurement and modeling
    • Authors: Chengyi Ding; Xuewei Lv; Senwei Xuan; Xueming Lv; Gang Li; Kai Tang
      Pages: 2503 - 2513
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Chengyi Ding, Xuewei Lv, Senwei Xuan, Xueming Lv, Gang Li, Kai Tang
      Shrinking core model is widely applied to describe the reduction of iron ore pellets, but limited to the illustration on powder sample. The reduction of powder materials is commonly observed in blast furnace production but has been rarely investigated. In this study, thermal kinetics analysis was conducted to describe the powder reduction of dicalcium ferrite (2CaO⋅Fe2O3, C2F), calcium ferrite (CaO⋅Fe2O3, CF), and hematite (Fe2O3, H), with particle sizes below 70µm. Isothermal reduction experiments were performed through thermogravimetry analysis under CO atmosphere. The reduction degrees and reaction rate constants increased in the order of C2F, CF, and H at 1123, 1173, and 1223K. The reduction rate analysis illustrated that the reduction of C2F, CF, and H appeared as one-, two-, and three-stage reactions, respectively. Moreover, the reduction of C2F and CF proceeded as the 2D reaction mechanism described by Avrami–Erofeev (A-E) equation. The reduction of H was initially controlled by 2D, followed by the 3D A-E kinetics equation. Phase with superior reducibility could be reduced by CO in more dimensions of sample layers. The reduction degrees and rate change expressed by A-E equations were verified to be in accordance with the experimental data. A new kinetics model was proposed to elucidate the reduction of C2F, CF, and H in ultrafine powder compared with that in pellets. The reduction process in the powdered samples comprised independent reduction stages caused by uniform CO diffusion in powdered particles.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.06.026
       
  • Design of impeller blades for efficient homogeneity of solid-liquid
           suspension in a stirred tank reactor
    • Authors: Deyin Gu; Zuohua Liu; Facheng Qiu; Jun Li; Changyuan Tao; Yundong Wang
      Pages: 2514 - 2523
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Deyin Gu, Zuohua Liu, Facheng Qiu, Jun Li, Changyuan Tao, Yundong Wang
      Computational fluid dynamics (CFD) was used to investigate the hydrodynamics of solid-liquid suspension process in a stirred tank with rigid impellers, rigid-flexible impellers and punched rigid-flexible impellers. The effects of impeller type, impeller speed, flexible connection piece length, impeller spacing, particle size, and aperture size/ratio on the mixing quality were investigated. Results showed that the degree of solid-liquid homogeneity increased with an increase in impeller speed. A long flexible connection piece was conductive to solid particles suspension process. The solid particles could not obtain enough momentum to suspend to the upper region of stirred tank with small impeller spacing. Larger particle size resulted in less homogenous distribution of solid particles. The optimum aperture ratio and aperture diameter of punched rigid-flexible impeller were 12% and 8mm, respectively, for solid particles suspension process. It was found that punched rigid-flexible impeller was more efficient in suspending solid particles compared with rigid impeller and rigid-flexible impeller at the same power consumption. In addition, less impeller power was consumed by punched rigid-flexible impeller compared with rigid impeller and rigid-flexible impeller at the same impeller speed.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.06.027
       
  • Exfoliated HNb3O8 nanosheets of enhanced acidity prepared by efficient
           contact of K2CO3 with Nb2O5
    • Authors: Jongha Park; Jae-Hong Lee; Young-Min Chung; Young-Woong Suh
      Pages: 2524 - 2531
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Jongha Park, Jae-Hong Lee, Young-Min Chung, Young-Woong Suh
      Although exfoliated HNb3O8 nanosheet (e-HNb3O8) is known to be a powerful catalyst in acid-catalyzed reactions, the preparation technique has limitations in its high-yield production. We herein report the enhanced exfoliation efficiency and recovery of e-HNb3O8 by contacting Nb2O5 solid with a diluted K2CO3 solution before ball milling (mechanochemical activation). The so-obtained e-HNb3O8 showed a larger specific surface area, a higher density of total acid sites and an improved catalytic performance in the dehydration of 2-heptanol and formic acid, compared to the corresponding sample prepared by the conventional solid-state mixing. The ball-milled K2CO3–Nb2O5 mixtures, layered KNb3O8, ion-exchanged HNb3O8 and exfoliated HNb3O8 samples were characterized by PXRD, TEM-EDS, TGA-MS and SEM-EDS. The characterization results revealed more intercalated K+ ions in KNb3O8 particles as well as more homogeneous K2CO3–Nb2O5 mixture when the employed preparation technique was used. This is achieved by more infiltration of K2CO3 into Nb2O5 lattice before ball milling, thereby resulting in the above positive findings. Therefore, our approach has great potential to be extended to other niobate-containing nanosheet-type materials.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.002
       
  • A two-step method for synthesis of micron sized nanoporous silver powder
           and ZnO nanoparticles
    • Authors: B. Bhushan; B.S. Murty; K. Mondal
      Pages: 2532 - 2541
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): B. Bhushan, B.S. Murty, K. Mondal
      Micron-sized nanoporous silver powder with pore size of ∼100–160nm and specific surface area of ∼4.7–5.5m2/g was synthesized from three mechanically alloyed Ag-Zn powders (composition: 25, 50 and 75 at.% Zn). Dealloying was carried out at free corrosion conditions in NaOH, HCl and AgNO3 solutions. Both partial and complete dealloying were obtained by suitable choice of electrolyte and time of exposure. Zn in the solution after dealloying was recovered in the form of ZnO nanoparticles with particle size of 55.7±18nm. The effect of composition and electrolyte on the degree of dealloying was also studied.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.003
       
  • Effects of main particle diameter on improving particle flowability for
           compressed packing fraction in a smaller particle admixing system
    • Authors: Mikio Yoshida; Atsushi Misumi; Jun Oshitani; Kuniaki Gotoh; Atsuko Shimosaka; Yoshiyuki Shirakawa
      Pages: 2542 - 2548
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Mikio Yoshida, Atsushi Misumi, Jun Oshitani, Kuniaki Gotoh, Atsuko Shimosaka, Yoshiyuki Shirakawa
      Particle flowability can be improved by admixing particles smaller than the original particles (main particles). However, the mechanisms by which this technique improves flowability are not yet fully understood. In this study, we examined compressed packing in a particle bed, which is affected by particle flowability. To estimate the mechanism of improvement, we investigated the effects of the main particle diameter on the improvement of compressed packing fractions experimentally. The main particles were 397 and 1460nm in diameter and the admixed particles were 8, 21, 62, and 104nm in diameter. The main and admixed particles were mixed in various mass ratios, and the compressed packing fractions of the mixtures were measured. SEM images were used to analyze the coverage diameter and the surface coverage ratio of the admixed particles on the main particles. The main particle packing fraction was improved as the diameter ratio (=main particles/admixed particles) increased. This was explained by a linked rigid-3-bodies model with leverage. Furthermore, the actual surface coverage ratio at which the most improved packing fraction was obtained decreased with increasing main particle diameter. This was explained by the difference in the curvature of the main particle surface.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.004
       
  • Effects of exposed facets on photocatalytic properties of WO3
    • Authors: Xin Wang; Huiqing Fan; Pengrong Ren
      Pages: 2549 - 2555
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Xin Wang, Huiqing Fan, Pengrong Ren
      Hexagonal WO3 (h-WO3) was prepared by using Na2SO4 and (NH4)2·SO4 as capping agents under different hydrothermal conditions. XRD, SEM and TEM results indicated that three types of morphologies, including h-WO3 rods with exposed (200) facets, h-WO3 nanosheets with exposed (002) facets and h-WO3 with corn cob-like structure and no preferred direction, could be obtained by tuning the capping agents and pH. Specifically, h-WO3 nanosheets with exposed (001) facets have the best visible photocatalytic properties due to its high specific surface area and charge separation nature on the (002) high energy facets.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.005
       
  • Characterization and properties of CuZrAlTiNi high entropy alloy coating
           obtained by mechanical alloying and vacuum hot pressing sintering
    • Authors: Wenjuan Ge; Bo Wu; Shouren Wang; Shuai Xu; Caiyun Shang; Zitang Zhang; Yan Wang
      Pages: 2556 - 2563
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Wenjuan Ge, Bo Wu, Shouren Wang, Shuai Xu, Caiyun Shang, Zitang Zhang, Yan Wang
      CuZrAlTiNi High entropy alloy (HEA) coating was synthesized on T10 substrate using mechanical alloying (MA) and vacuum hot pressing sintering (VHPS) technique. The MA results show that the final product of as-milled powders is amorphous phase. The obtained coating sintered at 950°C is compact and about 0.9mm in thickness. It is composed of a couple of face-centered cubic (FCC), one body-centered cubic (BCC) solid solutions and AlNi2Zr phase. The interface strength between coating and substrate is 355.5MPa measured by three point bending test. Compared with T10 substrate, the corrosion resistance of CuZrAlTiNi HEA coating is enhanced greatly in the seawater solution, which is indicated by the higher corrosion potential, wider passivation region, and secondary passivation. The average microhardness of the coating reaches 943 HV0.2, and is about 3.5 times higher than the substrate, which is mainly ascribed to the uniformly dispersed nano-size precipitates, phase boundary strengthening and solid solution strengthening. Moreover, the wear resistance of the coating is slightly improved in comparison with the substrate.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.006
       
  • Reaction mechanisms, resultant microstructures and tensile properties of
           Al-based composites fabricated in situ from Al-SiO2-Mg system
    • Authors: Heguo Zhu; Xiaodong Sun; Zhuli Yu; Jiewen Huang; Jianliang Li; Zonghan Xie
      Pages: 2572 - 2580
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Heguo Zhu, Xiaodong Sun, Zhuli Yu, Jiewen Huang, Jianliang Li, Zonghan Xie
      Reaction mechanisms, microstructures and tensile properties of the aluminum matrix composites made from Al-SiO2-Mg system were investigated. When the temperature increased from room temperature to around 761K, Mg dissolved into Al to form Mg-Al alloy. As the temperature increased to about 850K, the remaining Mg reacted with SiO2 to form MgO, Mg2Si and Si as expressed in step reaction I: 6Mg+2SiO2 →4MgO+Mg2Si+Si. Finally, with a further increase in temperature, the remaining SiO2 reacted with Al to produce Al2O3 and Si, while MgO reacted with Al2O3 to form MgAl2O4 as expressed in step reaction II: 4Al+3SiO2 +2MgO→2MgAl2O4 +3Si. The Si also dissolved into matrix Al to form Al-Si alloy. Accordingly, its reaction process consisted of two steps and their apparent activation energies were 218kJ/mol and 192kJ/mol, respectively. As compared to the composites prepared by Al-SiO2 system, its density increased from 2.4 to 2.6g/cm3, and its tensile strength and elongation increased from 165MPa and 3.95% to 187MPa and 7.18%, respectively.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.008
       
  • Influence of different parameters and their coupled effects on the
           
    • Authors: Karen Cacua; Robison Buitrago-Sierra; Bernardo Herrera; Farid Chejne; Elizabeth Pabón
      Pages: 2581 - 2588
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Karen Cacua, Robison Buitrago-Sierra, Bernardo Herrera, Farid Chejne, Elizabeth Pabón
      Nanofluids have been introduced as new-generation fluids able to improve energy efficiency in heat exchangers. However, stability problems related to both agglomeration and sedimentation of nanoparticles have limited industrial-level scaling. A fractional factorial experimental 2k−1 design was applied in order to evaluate the effects of nanoparticle concentration, surfactant type and concentration, ultrasonic amplitude as well as ultrasonic time on the stability of alumina (Al2O3) nanofluids. Commercial alumina nanoparticles (particle diameter <50nm) were dispersed in deionized water using ultrasonic probe dispersion equipment. Sodium dodecylbenzenesulfonate (SDBS) and cetyltrimethylammonium bromide (CTAB) were used as surfactants. The stability of the nanofluids in static mode was monitored by visual inspection and UV visible spectroscopy. The results of the experimental design showed that the coupled effects between surfactant type and surfactant concentration and between ultrasonication tip amplitude and ultrasonication time had the most pronounced effects on nanofluid stability. The experimental conditions providing the best stability were 0.5wt% of Al2O3, CTAB, critical micelle surfactant concentration, 30% ultrasonic amplitude and 30min of ultrasonication.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.009
       
  • Convection induced by vibrating rod in fine-powder bed
    • Authors: Shuji Matsusaka; Sho Sato; Masatoshi Yasuda
      Pages: 2589 - 2596
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Shuji Matsusaka, Sho Sato, Masatoshi Yasuda
      In this study, vibration-induced convection was studied experimentally using a fine powder with a mass median particle diameter of 8μm. A cylindrical rod arranged vertically in a powder container was vibrated horizontally with simple harmonic motion at a frequency of 300Hz using a piezoelectric vibrator. For a vibration amplitude of 10μm, particles around the cylindrical rod were consolidated to a certain extent due to gravity; however, for a vibration amplitude of 70μm or more, a pair of convection rolls formed on both sides of the vibrating rod. The strength of the convection was quantified from the particle velocity distribution in the convection rolls, and the relationship between the convection strength and vibration amplitude was elucidated. In addition, the air-pressure distribution in the powder bed was measured showing that the convection strength correlates with the characteristic positive pressure, i.e., the average value of positive pressure measurements. Elliptical motion and circular motion as well as simple harmonic motion were applied to the cylindrical rod by adding two harmonic motions in directions orthogonally crossing each other with a phase difference of π/2rad. The convection of the particles varied according to the Lissajous trajectory of the cylindrical rod. Even for simple harmonic motion, heaps of a pair of convection cells overlapped each other. In the case of elliptical motion, the overlapping portion of the heaps became larger. In the case of circular motion, the two heaps were integrated into one circular heap, and there were no effects of the circumferential angle on the particle velocity and the characteristic positive pressure.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.010
       
  • Density-driven sinking dynamics of a granular ring in sheared granular
           flows
    • Authors: Chun-Chung Liao; Shu-San Hsiau; Yu-Ming Hu
      Pages: 2597 - 2604
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Chun-Chung Liao, Shu-San Hsiau, Yu-Ming Hu
      This study reports experimental findings on the sinking dynamics of a heavy granular ring caused by the density-driven segregation effect in sheared granular flows. Specifically, this study systematically investigates the influences of the density ratio, shear rate, and solid fraction of the granular material on the sinking behavior of a heavy granular ring. The parameters of the dimensionless sinking depth and sinking rate, respectively, describe the change in the granular ring position and quantify the particle sinking speed. Experimental results show that both the dimensionless sinking depth and the sinking rate increase as the bottom wall velocity (shear rate) and solid fraction increase. The dimensionless sinking depth and the sinking rate also exhibit a linear relation. The dimensionless sinking depth does not increase monotonically as the density ratio increases. The sinking rate increases linearly with the final steady-state sinking depth for the same heavy granular ring structure, regardless of the wall velocity (shear rate), solid fraction, and density ratio.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.011
       
  • Thermal stability analysis of Cu-11.8wt%Al milled samples by TEM and
           HT-XRD
    • Authors: N.N. Sanchez Pascal; M.F. Giordana; F. Napolitano; M.R. Esquivel; E. Zelaya
      Pages: 2605 - 2612
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): N.N. Sanchez Pascal, M.F. Giordana, F. Napolitano, M.R. Esquivel, E. Zelaya
      In this work, the thermal stability of two samples of Cu-11.8wt%Al obtained by different milling processes is analyzed. Several TEM techniques were used and HT-XRD experiments performed to determine the crystal structure and the morphological microstructure of the samples obtained during different heat treatments. The heat treatments were: quenching from 850°C to room temperature and two consecutive calorimetric runs at 5°C/min. After the quenching,α2 is the major phase observed, reaching 95mass%. The remaining 5mass% consisted of martensitic phases: one sample had γ′, a hexagonal structure, and the other β1′, a rhombohedral structure. During the first calorimetric run, the sample containing the γ′ phase exhibited a calorimetric event and the sample containing the β1′ phase did not. The calorimetric event is attributed to the austenitic transformation γ′→β1. The lack of calorimetric event in the sample containing the β1′ is associated with the inhibition of the transformation β1′→β1 because of the precipitation of the γ2 phase. Finally, the absence of a calorimetric event in the second run with the first sample is associated with the retransformation to β1′ instead to γ′ phase during cooling of the first calorimetric run. These studies determined that the first sample is a better candidate than the second sample to produce a shape memory alloy after thermo-mechanical treatments of the milled powders.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.012
       
  • Controlled preparation and photoluminescence properties of
           Zn6O(OH)(BO3)3:Eu(III) phosphors
    • Authors: Pan Liang; Li-Jun Qiao; Zhi-Hong Liu
      Pages: 2613 - 2620
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Pan Liang, Li-Jun Qiao, Zhi-Hong Liu
      Controlling the morphology of micro/nanomaterials precisely enable us to manipulate their properties as desired. Therefore, understanding the complex growth mechanism of micro/nanomaterials, regulating and controlling their morphology and related luminescent properties are the focuses of chemistry and materials science. In this paper, we have firstly prepared five different morphologies of zinc borate (Zn6O(OH)(BO3)3:Eu(III), ZBEu) phosphor by hydrothermal method, which were characterized by EDS, XRD, TG-DTA, FT-IR, SEM and TEM. Different morphologies of ZBEu were obtained via adjusting some of the reaction parameters, and the growth mechanisms of five kinds of morphologies were illustrated in detail. Photoluminescence (PL) analysis manifested that sphere-like ZBEu exhibited the strongest PL intensity in the five morphologies under the same doping concentration. The reasons why different morphology influences the PL intensity are also discussed in detail. Meanwhile, the influences of the doped Eu(III) concentrations and prepared time on the luminescent properties of ZBEu phosphor have also been investigated. The results indicate that Zn6O(OH)(BO3)3 could serve as a new good hydrated borate matrix for light-emitting materials.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.013
       
  • Dynamic analysis of the scale-up of fluidized beds
    • Authors: M. Tahmasebpoor; R. Zarghami; R. Sotudeh-Gharebagh; J.R. van Ommen; N. Mostoufi
      Pages: 2621 - 2629
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): M. Tahmasebpoor, R. Zarghami, R. Sotudeh-Gharebagh, J.R. van Ommen, N. Mostoufi
      A method is developed for hydrodynamics scale-up of gas-solid fluidized beds based on recurrence quantification analysis of nonlinear time series of pressure fluctuations. This method is an improvement of the previous method by including the entropy of pressure fluctuations to the list of scale-up parameters. Experiments were carried out at varying conditions, e. g., bed diameter (5, 9, 15, 40 and 80cm ID), particle size (150, 300, 400 and 600μm), bed height at aspect ratios (1, 1.5 and 2) and superficial gas velocities (ranging 0.1 to 1.7m/s) to identify the main parameters that influence the dynamics and to develop a general interpretation of the analysis results. By investigation of the effect of operating parameters on entropy, a quantitative empirical correlation is proposed for including the entropy in the scale-up parameters. It was shown that this correlation improves the Glicksman’s method for the scale-up of fluidized beds.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.014
       
  • Double diffusive flow of a hydromagnetic nanofluid in a rotating channel
           with Hall effect and viscous dissipation: Active and passive control of
           nanoparticles
    • Authors: R. Tripathi; G.S. Seth; M.K. Mishra
      Pages: 2630 - 2641
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): R. Tripathi, G.S. Seth, M.K. Mishra
      The investigation of simultaneous effects of Hall current and viscous dissipation on three-dimensional magnetohydrodynamic nanofluid flow in a horizontal rotating channel with active and passive control of nanoparticles, is carried out. The lower sheet is considered stretching while the upper sheet is kept fixed. Mathematical model is developed using boundary layer and scale analysis approach. Similarity transformation technique is employed to translate the governing partial differential equations into ordinary differential equations. The bvp4c solver of MATLAB is employed to solve transformed equations. Computations for nanofluid velocity, nanofluid temperature distribution and distribution of nanoparticles along with skin friction co-efficient and Nusselt number, are carried out for a range of values of pertinent flow parameters. A comparative analysis of effect of CuO and Al 2 O 3 nanoparticles on velocity, temperature, nanoparticle distribution, skin friction coefficient and Nusselt number is carried out. Rate of heat transfer at the lower sheet is observed to be a decreasing function of magnetic field whereas this physical quantity is getting enhanced as the volume fraction of nanoparticles are increased.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.015
       
  • Co2(OH)3Cl nanoparticles as new-type electrode material with high
           electrochemical performance for application in supercapacitor
    • Authors: Wenle Ma; Yongmei Feng; Li Wang; Yanhong Li; Min Shi; Hongtao Cui
      Pages: 2642 - 2647
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Wenle Ma, Yongmei Feng, Li Wang, Yanhong Li, Min Shi, Hongtao Cui
      In this work, we report the preparation of Co2(OH)3Cl nanoparticles with average size of ∼20nm and well-defined cubic shape at room temperature by an epoxide precipitation route. It was found that the as-prepared Co2(OH)3Cl nanoparticles could be used as a promising new electrode material for application in redox supercapacitors due to its high electrochemical performance. It presented superior specific capacitance of 783Fg−1 at low current density of 2.8Ag−1, while it had a high value of 604Fg−1 at high current density of 56.6Ag−1, proving its excellent high rate performance. Its 75% capacitance retention after 10,000 cycles of charge–discharge demonstrated its long-life span. According to characterization results, the possible mechanism for the electrochemical process that Co2(OH)3Cl nanoparticles underwent was proposed as a process of Co2(OH)3Cl→β-Co(OH)2 →CoOOH↔Co3O4.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.016
       
  • Preparation of mono-dispersed carbonaceous spheres via a hydrothermal
           process
    • Authors: Saisai Li; Feng Liang; Junkai Wang; Haijun Zhang; Shaowei Zhang
      Pages: 2648 - 2657
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Saisai Li, Feng Liang, Junkai Wang, Haijun Zhang, Shaowei Zhang
      Mono-dispersed carbonaceous spheres (CS) with a narrow size distribution were synthesized via hydrothermal treatment of glucose. The effects of hydrothermal temperature and time, glucose concentration and pH value of solution were investigated in detail. Structures and surface properties of as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Induced coupled plasma emission spectroscopy (ICP), thermogravimetric analysis/differential scanning calorimetry (TG/DSC), Nitrogen adsorption/desorption and Fourier transformed infrared spectroscopy (FTIR). The results showed that the production yield of CS increased from 2.1 to 32% with increasing the temperature from 160 to 180°C, and the average size increased from 0.23 to 0.95μm with extending the hydrothermal time from 8 to 16h. pH value of the starting solution showed an evident effect on the morphology of CS via affecting the decomposition products of glucose. CS could be obtained when the pH value of starting solution was less than 12, but further increasing the pH value to 13–14 led to the formation of lumpy aggregations of carbon rather than spherical CS. The CS prepared under pH 6 and 9 showed good adsorption capacity for Methylene blue (MB), which was attributed to their relatively high specific surface area.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.017
       
  • Insights into the dissolution mechanisms of detergent agglomerates: An
           approach to assess dissolution heterogeneity
    • Authors: Bochen Pan; Rui Shen; Zhe Guan; Leping Dang; Hongyuan Wei
      Pages: 2658 - 2664
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Bochen Pan, Rui Shen, Zhe Guan, Leping Dang, Hongyuan Wei
      In this work, the dissolution mechanisms of detergent agglomerates with different binders were investigated in aqueous solution. The dissolution processes of detergent agglomerates were online monitored by using in situ UV–VIS spectrophotometer and electric conductivity probe. Dissolution profiles were correlated by Weibull model to evaluate the time-dependent dissolution rate coefficient and to classify the type of dissolution rate function kt (t). The Kullback-Leibler information distance dK-L was proposed to assess the degree of dissolution heterogeneity. The results indicate that the sodium linear alkylbenzene sulfonates (NaLAS) and sodium carbonates (Na2CO3) in detergent agglomerates have different dissolution behaviors, and their dissolution rates are influenced by the type and content of binders. Moreover, detergent agglomerates using semi-solid NaLAS paste or liquid linear alkylbenzene sulfonic acid (HLAS) as binders in granulation processes follow different dissolution mechanisms in water.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.018
       
  • A discrete element method-based approach to predict the breakage of coal
    • Authors: Varun Gupta; Xin Sun; Wei Xu; Hamid Sarv; Hamid Farzan
      Pages: 2665 - 2677
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Varun Gupta, Xin Sun, Wei Xu, Hamid Sarv, Hamid Farzan
      Pulverization is an essential pre-combustion technique employed for solid fuels, such as coal, to reduce particle sizes. Smaller particles ensure rapid and complete combustion, leading to low carbon emissions. Traditionally, the resulting particle size distributions from pulverizers have been determined by empirical or semi-empirical approaches that rely on extensive data gathered over several decades during operations or experiments, with limited predictive capabilities for new coals and processes. This work presents a Discrete Element Method (DEM)-based computational approach to model coal particle breakage with experimentally characterized coal physical properties. The effect of select operating parameters on the breakage behavior of coal particles is also examined.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.019
       
  • Synthesis of ZnOAl2O3 core-shell nanocomposite materials by fast and
           facile microwave irradiation method and investigation of their optical
           properties
    • Authors: Md. Obaidullah; Takeshi Furusawa; Iqbal Ahmed Siddiquey; Masahide Sato; Noboru Suzuki
      Pages: 2678 - 2686
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Md. Obaidullah, Takeshi Furusawa, Iqbal Ahmed Siddiquey, Masahide Sato, Noboru Suzuki
      Alumina (Al2O3) coated ZnO core-shell structures were synthesized by a novel, fast, and facile route utilizing microwave (MW) irradiation to control photocatalytic property of ZnO. The phase analysis and the core–shell structure development were corroborated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), X-ray fluorescence (XRF), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) analysis and Fourier transform infrared spectroscopy (FT-IR). The XPS results affirmed that elements on the coated surface were Al and O. Zeta potential analysis predicted the presence of Al2O3 layer on ZnO due to almost similar zeta potential curve for pure Al2O3 and Al2O3 coated ZnO nanoparticles. There was no significant change in band gap energy of ZnO after amorphous Al2O3 coating as obtained from derived data of the reflectance spectra but gradual decreasing of reflectance in the visible range, measured by UV–vis spectroscopy, of the prepared core-shell nanoparticle may be due to the coating of amorphous Al2O3 on ZnO. The photocatalytic efficiency of ZnO was reduced after amorphous Al2O3 layer as confirmed by the photodegradation of methylene blue under UV irradiation.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.020
       
  • Preparation of high performance soft magnetic alloy Fe-4Si-0.8P by metal
           injection molding
    • Authors: Zhiyuan Sun; Mingli Qin; Rui Li; Jidong Ma; Fei Fang; Huifeng Lu; Xuanhui Qu
      Pages: 2687 - 2693
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Zhiyuan Sun, Mingli Qin, Rui Li, Jidong Ma, Fei Fang, Huifeng Lu, Xuanhui Qu
      Fe-4Si-0.8P soft magnetic alloy was prepared by metal injection molding (MIM). Ferrophosphorus liquid phase sintering promoted densification and enhanced magnetic properties. The sample with nearly full density, the saturation induction of 1.59T, maximum permeability of 2467, coercive force of 130A/m and resistivity of 81.2 μΩ·cm was obtained at 1300°C for 4h. Competitive properties contributed toward achieving low magnetic losses. Therefore, MIM Fe-4Si-0.8P can be widely used in the field of magnetic materials.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.021
       
  • Simulation of particle-laden flow in a Humphrey spiral concentrator using
           dust-liquid smoothed particle hydrodynamics
    • Authors: Jihoe Kwon; Hyungseok Kim; Sugyeong Lee; Heechan Cho
      Pages: 2694 - 2705
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Jihoe Kwon, Hyungseok Kim, Sugyeong Lee, Heechan Cho
      This paper demonstrates that our extended smoothed particle hydrodynamics (SPH) model can successfully simulate multiphase flow in a Humphrey spiral concentrator (HSC) with two phases: powder and water. The powder phase in the model was assumed to be a continuum, as the spacing between particles in this state is much smaller than the typical length scale of flow. Further investigation was conducted on the influences of various design factors of the HSC, including the descent angle and curvature profile of the trough, during the separation of a binary mineral particle mixture. The model was validated by comparing the simulated results with the experimental results of Loveday and Cilliers (1994) as well as those of a novel lab-scale-experiment using a miniature of the HSC. The proposed SPH model accurately simulated dusty liquid flow in the HSC in both cases with an acceptable degree of accuracy relative to the experimental results. These studies are expected to be useful in future optimizations of HSC design and operating conditions.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.022
       
  • Estimation of agglomerate size of multi-walled carbon nanotubes in
           fluidized beds
    • Authors: Sung Woo Jeong; Dong Hyun Lee
      Pages: 2706 - 2712
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Sung Woo Jeong, Dong Hyun Lee
      The objective of this study was to determine hydrodynamic characteristics of multi-walled carbon nanotubes (MWCNTs) agglomerates and examine their sizes. The bed collapsing process of MWCNTs agglomerates was found to be closer to that of Geldart group C particles than group A particles. Median diameters of MWCNTs agglomerates determined by sedimentation method at initial superficial gas velocity of 0.120 and 0.190m/s were 157 and 221μm, respectively. The size of these MWCNTs agglomerates in fluidization state was measured by image analysis using a high speed camera. Median diameters of these MWCNTs agglomerates in freeboard were increased from 138 to 189μm as superficial gas velocity was increased from 0.088 to 0.190m/s at static bed height of 0.16m. Median diameter and size distribution determined by sedimentation method fitted well with those measured using image analysis. Results were reasonable at superficial gas velocity up to 0.190m/s.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.023
       
  • The effects of Sr concentration on physicochemical properties, bioactivity
           and biocompatibility of sub-micron bioactive glasses spheres
    • Authors: Qing Hu; Weihui Jiang; Xiaofeng Chen; Yuli Li; Qiming Liang
      Pages: 2713 - 2722
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Qing Hu, Weihui Jiang, Xiaofeng Chen, Yuli Li, Qiming Liang
      We synthetized a series of strontium-substituted submicron bioactive glasses spheres (Sr-SBG, SiO2-P2O5-CaO-SrO) in which strontium was substituted for calcium on a mole percentage basis, then investigated the effect of strontium-substituted amount on morphologies, physicochemical properties, apatite-forming bioactivity of SBG and evaluated the proliferation, differentiation and mineralization of Sr-SBG with different strontium substitution amounts by co-cultured with human dental pulp cells (HDPCs). Results showed that Sr-SBG with different strontium substitution amounts were successfully fabricated and substituting different strontium amounts did not affect the morphology and particle size of SBG. All the Sr-SBG possessed good apatite-forming ability, but substituting a certain amount of strontium for calcium would weaken the apatite-forming ability of SBG. Additionally, all the Sr-SBG extractions promoted proliferation, early odontogenic differentiation and mineralization of HDPCs, however, the cell proliferation, differentiation and mineralization abilities would be reduced when the substituted amount of strontium was excess (15mol%). This study suggests that Sr-SBG with moderate strontium substitution amounts can be used asa more promising biomaterial for dental repair.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.024
       
  • Numerical simulation of solid-liquid suspension in a stirred tank with a
           dual punched rigid-flexible impeller
    • Authors: Deyin Gu; Zuohua Liu; Zhaoming Xie; Jun Li; Changyuan Tao; Yundong Wang
      Pages: 2723 - 2734
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Deyin Gu, Zuohua Liu, Zhaoming Xie, Jun Li, Changyuan Tao, Yundong Wang
      The hydrodynamics of solid-liquid suspension process in a stirred tank with a dual rigid impeller, a dual rigid-flexible impeller, and a dual punched rigid-flexible impeller were investigated using computational fluid dynamics (CFD) simulation. A classical Eulerian-Eulerian approach coupled with standard k-ε turbulence model was employed to simulate solid-liquid turbulent flow in the stirred tank. The multiple reference frame (MRF) approach was used to simulate impeller rotation. The effects of impeller type, impeller speed, flexible connection piece width/length of dual rigid-flexible impeller, aperture size/ratio of dual punched rigid-flexible impeller, particle diameter, and liquid viscosity on the homogeneity degree of solid-liquid system were investigated. Results showed that the homogeneity degree of solid-liquid system increased with an increase in impeller speed. A long and wide flexible connection piecewas conductive to solid particles suspension process. Larger particle diameter resulted in less homogenous distribution of solid particles. An increase in liquid viscosity was beneficial to maintain solid particles in suspension state. The optimum aperture ratio and aperture diameter were 12% and 8mm, respectively, for solid particles suspension process. It was found that dual punched rigid-flexible impeller was more efficient in terms of solid particles suspension quality compared with dual rigid impeller and dual rigid-flexible impeller under the same power consumption.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.025
       
  • Analysis of triboelectric charging of particles due to aerodynamic
           dispersion by a pulse of pressurised air jet
    • Authors: M. Ali; M. Ghadiri
      Pages: 2735 - 2740
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): M. Ali, M. Ghadiri
      Triboelectric charging of powders causes nuisance and electrostatic discharge hazards. It is highly desirable to develop a simple method for assessing the triboelectric charging tendency of powders using a very small quantity. We explore the use of aerodynamic dispersion by a pulse of pressurised air using the disperser of Morphologi G3asa novel application. In this device particles are dispersed by injection of a pulse of pressurised air, the dispersed particles are then analysed for size and shape analysis. The high transient air velocity inside the disperser causes collisions of sample particles with the walls, resulting in dispersion, but at the same time it could cause triboelectric charging of the particles. In this study, we analyse this process by evaluating the influence of the transient turbulent pulsed-air flow on particle impact on the walls and the resulting charge transfer. Computational Fluid Dynamics is used to calculate particle trajectory and impact velocity asa function of the inlet air pressure and particle size. Particle tracking is done using the Lagrangian approach and transient conditions. The charge transfer to particles is predicted asa function of impact velocity and number of collisions based on a charge transfer model established previously for several model particle materials. Particles experience around ten collisions at different velocities as they are dispersed and thereby acquire charges, the value of which approaches the equilibrium charge level. The number of collisions is found to be rather insensitive to particle size and pressure pulse, except for fine particles, smaller than about 30µm. As the particle size is increased, the impact velocity decreases, but the average charge transfer per particle increases, both very rapidly. Aerodynamic dispersion by a gas pressure pulse provides an easy and quick assessment of triboelectric charging tendency of powders.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.026
       
  • Biotemplating synthesis and photocatalytic activities of N-doped CeO2
           microcapsule tailored by hemerocallis pollen
    • Authors: Chengbao Liu; Hui Sun; Junchao Qian; Zhigang Chen; Yifei Lv; Feng Chen; Xiaowang Lu; Zhengying Wu
      Pages: 2741 - 2746
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Chengbao Liu, Hui Sun, Junchao Qian, Zhigang Chen, Yifei Lv, Feng Chen, Xiaowang Lu, Zhengying Wu
      As one of the most active rare earth, CeO2 has been receiving considerable attention due to its multifunctional properties. Herein, we present a facile and green route toward hierarchical N-doped CeO2 hollow microcapsule by using hemerocallis pollen as biotemplate. The resulting sample was characterized by X-ray diffraction spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, nitrogen adsorption and desorption, UV–Vis diffuse reflectance spectra and X-ray photoelectron spectrogram. The obtained N-doped CeO2 microcapsule exhibits much more superior photocatalytic activity for the hydrogen generation by water splitting, which owing to the nitrogen doping and structural features. This facile method of research provides a rational approach to replicate desired biological structures for semiconductor nanoparticle catalysis in other potential areas.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.027
       
  • Thermal performance of nanofluids in metal foam tube: Thermal dispersion
           model incorporating heterogeneous distribution of nanoparticles
    • Authors: Mohammad Ameri; Mohammad Amani; Pouria Amani
      Pages: 2747 - 2755
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Mohammad Ameri, Mohammad Amani, Pouria Amani
      This study presents the application of a modified single-phase method by thermal dispersion model incorporating heterogeneous distribution of nanoparticle concentration for evaluating thermal performance of a nanofluid in a circular porous metal foam tube. Numerical approach was conducted for Re =200–1000, mean concentration of 0.5–2%, and metal foam porosity of 0.7–0.9. It is observed that the predicted data by application of the thermal dispersion approach are in satisfactory agreement with those obtained experimentally, whereas applying the general homogeneous model results in an underestimation. The results reveal that the heterogeneity of the concentration distribution is directly proportional to nanoparticle mean concentration, Reynolds number, and the metal foam porosity. The velocity and temperature profiles at a cross section have been found to be flatter in dispersion model compared to those obtained from the homogeneous model. Furthermore, it is achieved that the Nusselt number varies directly relative to mean concentration and Reynolds number, whereas it inversely alters relative to the porosity. This reduction is found to be more profound at lower porosities.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.07.028
       
  • Hydrothermal synthesis, characterization and photodegradation of organic
           pollutants of CoCr2O4/Ag nanostructure and thermal stability of epoxy
           acrylate nanocomposite
    • Authors: Ali Abbasi; Masood Hamadanian; Masoud Salavati-Niasari; Mohammad Peyman Mazhari
      Pages: 2756 - 2765
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Ali Abbasi, Masood Hamadanian, Masoud Salavati-Niasari, Mohammad Peyman Mazhari
      Present work describes a facile method to prepare CoCr2O4 nanostructured using of Co(acac)2·4H2O and CrCl3·6H2O as cobalt and chrome sources respectively. 2-Hydroxy-1-naphthaldehyde-1,4-diaminobutane and CTAB was applied as stabilization agents. N(Et)3, NaOH and tetraethylenepantamine (TEPA) were used as alkaline agent. TEPA and 2-hydroxy-1-naphthaldehyde-1,4-diaminobutane were chosen as the best alkaline agent and stabilization agent respectively. Silver nanoparticles were doped to the product by using photodeposition approach. The structural, optical, and morphological characteristics of as-synthesized CoCr2O4 and CoCr2O4/Ag nanostructures were analyzed using EDS, SEM, VSM, XRD, FT-IR and DRS spectroscopy. The photocatalytic behavior of CoCr2O4 nanoparticles was evaluated using the degradation of various organic pollutants (Rhodamine B, methylene blue and methyl orange) under UV irradiation. Also the effect of reaction parameters such as pH, on the grain size and shape of the nanoparticles were investigated. The influence of the CoCr2O4/Ag NPs on the thermal properties of epoxy acrylate was investigated by using thermogravimetry analysis. Results indicate that, CoCr2O4/Ag nanoparticles can enhance the thermal stability of the epoxy acrylate matrix.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.08.001
       
  • Facile synthesis of Sn doped ZnO nanotetrapods for detection of relatively
           non-lethal volatiles
    • Authors: Sudip K. Sinha; Saptarshi Ghosh
      Pages: 2766 - 2773
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Sudip K. Sinha, Saptarshi Ghosh
      While there’s a perpetual buzz around zinc oxide superstructures for their unique optical features, the versatile material has been constantly utilized to manifest tailored electronic properties through rendition of distinct morphologies. And yet, the unorthodox approach of implementing the hierarchical structures of ZnO for volatile sensing applications has ample scope to accommodate new unconventional morphologies. Likewise, this article presents self-catalytic synthesis of Sn-doped ZnO nanotetrapods on Si (100) substrates through thermal evaporation–condensation method, and their subsequent deployment for volatile sensing. In particular, the sensors were utilized to detect molecules of acetone and ammonia below their permissible exposure limits which returned sensitivities of around 80% and 50% respectively. The influence of Sn concentration on the growth, microstructural and optical properties of the nanoprisms along with its role in augmenting the sensing parameters has been detailed. The features for the nanoprisms include a length of few micrometers along with a diameter ranging from 300 to 500nm. High resolution microscopic images confirmed the hexagonal crystallography for the nanoprisms, while SAED pattern asserted the single crystalline nature. An estimate of the sensing parameters against dispensed target molecules highlighted the potential for the nanoprisms as an effective volatile sensing material.
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      PubDate: 2017-09-27T16:52:13Z
      DOI: 10.1016/j.apt.2017.08.002
       
  • Preparation and characterization of distillers’ grain based activated
           carbon as low cost methylene blue adsorbent: Mass transfer and equilibrium
           modeling
    • Authors: Hui Wang; Ruzhen Xie; Jie Zhang; Jun Zhao
      Abstract: Publication date: Available online 10 October 2017
      Source:Advanced Powder Technology
      Author(s): Hui Wang, Ruzhen Xie, Jie Zhang, Jun Zhao
      In this study, an orthogonal array design method was employed to optimize carbon preparation from distillers’ grain (DGAC). The physical and chemical properties of the produced DGAC were characterized using scanning electron microscopy (SEM), N2 adsorption–desorption technique (Brunauer-Emmett-Teller, BET), and fourier transform infrared spectroscopy (FTIR). The BET surface area of DGAC was found to be 1430 m2/g, with average pore diameter of 2.19 nm. Batch experiments were carried out to study the adsorption of methylene blue (MB) onto DGAC. External mass transfer model, internal diffusion model, Boyd model and pseudo-second-order model were used to fit the adsorption kinetic process of MB adsorption onto DGAC. The results shows the external mass transfer model could only describe the adsorption for the initial 5 min, and later the internal diffusion in the pores of the carbon particles became a main resistance, chemisorption was also involved in the adsorption process. The adsorption equilibrium was described best by Langmuir isotherm with maximum adsorption capacity of 934.6 mg/g of MB at 55°C, thermodynamic studies confirmed that the adsorption of MB onto DGAC was spontaneous and thermodynamically favourable. These findings support the potential of using distillers’ grain as raw material to prepare well-developed porous texture adsorbent with huge MB removal capacity.
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      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.027
       
  • Bio-mechanochemical synthesis of silver nanoparticles with antibacterial
           activity
    • Authors: Matej Baláž; Nina Daneu; Ľudmila Balážová; Erika Dutková; Ľudmila Tkáčiková; Jaroslav Briančin; Mária Vargová; Miriama Balážová; Anna Zorkovská; Peter Baláž
      Abstract: Publication date: Available online 10 October 2017
      Source:Advanced Powder Technology
      Author(s): Matej Baláž, Nina Daneu, Ľudmila Balážová, Erika Dutková, Ľudmila Tkáčiková, Jaroslav Briančin, Mária Vargová, Miriama Balážová, Anna Zorkovská, Peter Baláž
      By using a bio-mechanochemical approach combining mechanochemistry (ball milling) and green synthesis for the first time, silver nanoparticles (Ag NPs) with antibacterial activity were successfully synthesized. Concretely, eggshell membrane (ESM) or Origanum vulgare L. plant (ORE) and silver nitrate were used as environmentally friendly reducing agent and Ag precursor, respectively. The whole synthesis took 30 min in the former and 45 min in the latter case. The photon cross-correlation measurements have shown finer character of the product in the case of milling with Origanum. UV–VIS measurements have shown the formation of spherical NPs in both samples. TEM study has revealed that both samples are composites of nanosized silver nanoparticles homogenously dispersed within the organic matrices. It has shown that the size and size distribution of the silver nanoparticles is smaller and more uniform in the case of eggshell membrane matrix implying lower silver mobility within this matrix. The antibacterial activity was higher for the silver nanoparticles synthesized with co-milling with Origanum plant than in the case of milling with eggshell membrane.
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      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.028
       
  • Predictive CFD modeling of whey protein denaturation in skim milk spray
           drying powder production
    • Authors: M. Jaskulski; J.C. Atuonwu; T.T.H. Tran; A.G.F. Stapley; E. Tsotsas
      Abstract: Publication date: Available online 10 October 2017
      Source:Advanced Powder Technology
      Author(s): M. Jaskulski, J.C. Atuonwu, T.T.H. Tran, A.G.F. Stapley, E. Tsotsas
      A new model of whey protein thermal inactivation has been combined with a CFD model developed for skim milk spray drying. Extensive evaporation and particle formation models were used to calculate particle moisture contents, temperatures and residence times. Calculated parameters were then used as input data for an experimentally developed quality model based on Williams-Landel-Ferry (WLF) equations for inactivation kinetics. The developed quality model was implemented into the CFD code and calculated in parallel to simulations of skim milk droplets evaporation based on the characteristic drying curve approach. The quality model and the simulation procedure were validated by comparison of protein activity levels obtained from the CFD with data obtained from differential scanning calorimetry (DSC) of milk powder samples collected during skim milk spray drying experiments. The simulations for different feed rates fit well with measurement results and show that the loss of whey protein activity is lower at higher feed rates, due to lower temperature fields in this case.
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      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.026
       
  • On the facile polyvinyl alcohol assisted sol-gel synthesis of tetragonal
           zirconia nanopowder with mesoporous structure
    • Authors: M.A. Shadiya; Nisha Nandakumar; Rani Joseph; K.E. George
      Abstract: Publication date: Available online 9 October 2017
      Source:Advanced Powder Technology
      Author(s): M.A. Shadiya, Nisha Nandakumar, Rani Joseph, K.E. George
      A facile template assisted sol-gel method has been used to prepare nanoparticles of tetragonal zirconia (t-ZrO2) with spherical morphology and porous structure along with mono dispersibility. The medium assisting growth of nanoparticles mainly consisted of ZrOCl2·8H2O and NH4OH as reactants in a 1:2 mixture of Isopropyl alcohol (IPA)-polyvinyl alcohol (PVA) as the dispersing agent. The effect of medium, IPA-PVA mixture on crystallite size and agglomeration was studied and discussed on the basis of XRD and also based on possible surface reactions. More over reacting medium and calcination temperature has vital role in determining the crystallinity and morphology of ZrO2. Trials based on mode of addition of the reacting medium followed by calcination provides mesoporous, spheroid, monoclinic zirconia (m-ZrO2) with an average particle size of 15 nm. The sample prepared under optimized conditions (2 wt% PVA-IPA) showed pure tetragonal crystallite phase with an average particle size of 5 nm, surface area of 56 m2 g−1, and a mesoporous structure after calcination at 600 °C for 5 h. The tetragonal (t-ZrO2) phase formed were stable and showed spherical morphology up to 600 °C after which the nanostructure was disturbed drastically; the agglomeration leads to structure collapse forming hard conglomerates and finally leads to monoclinic crystalline phase.
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      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.029
       
  • Unsteady MHD heat and mass transfer of a non-Newtonian nanofluid flow of a
           two-phase model over a permeable stretching wall with heat
           generation/absorption
    • Authors: Mohamed R. Eid; Kasseb L. Mahny
      Abstract: Publication date: Available online 9 October 2017
      Source:Advanced Powder Technology
      Author(s): Mohamed R. Eid, Kasseb L. Mahny
      The combined effects of magnetic field and heat generation or absorption on unsteady boundary-layer convective heat and mass transfer of a non-Newtonian nanofluid over a permeable stretching wall have been addressed. A power-law model includes Brownian motion and thermophoresis influences are utilized for non-Newtonian nanofluids with a convective boundary condition. The non-linear governing equations are reduced into ODEs by similarity transformations and solved numerically by using Runge-Kutta-Fehlberg 4th–5th order numerical method (RKF45) with shooting technique. The different physical parameters effects such as the magnetic parameter ( M ) , the heat source/sink parameters ( λ ) , the unsteadiness parameter ( A ) , the generalized Prandtl and Lewis numbers on the dimensionless velocity, temperature and nanoparticles volume fraction, in addition to the skin friction, local Nusselt and Sherwood numbers are analyzed. It is reached that the thermal and concentration boundary-layer thickness has higher values with the increasing of magnetic field and heat generation in the case of a pseudo-plastic nanofluid than others.
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      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.021
       
  • Synthesis of heterogeneous Ag-Cu bimetallic monolith with different mass
           ratios and their performances for catalysis and antibacterial activity
    • Authors: Manisha Sharma; Satyajit Hazra; Soumen Basu
      Abstract: Publication date: Available online 9 October 2017
      Source:Advanced Powder Technology
      Author(s): Manisha Sharma, Satyajit Hazra, Soumen Basu
      Combination of two or more metallic particles along with high surface area and porous structure exhibits enhanced catalytic as well as antibacterial activity. Here, Ag-Cu bimetallic monoliths were synthesized by nanocasting method by strictly adjusting the molar ratio of Ag-Cu. This work is mainly focused on the effect of molar ratio (Ag:Cu) on surface area (14–110 m2/g) and porous size of bimetallic monoliths, which has great influence on enhancement of catalytic and antimicrobial activity. The catalytic activity of bimetallic Ag-Cu monoliths was evaluated for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of excess NaBH4. The reaction rate follows pseudo-first order for reduction of 4-NP with a reduction efficacy of ∼95%. The effect of Ag:Cu molar ratio and reaction conditions on the rate of reaction were investigated. In comparison with novel monometallic silver monoliths, bimetallic Ag-Cu monoliths exhibit high catalytic performance on the reduction of 4-NP. These heterogeneous catalysts were effortlessly recovered and reused (up to 8 cycles) after completion of catalytic reaction. As bimetallic Ag-Cu particles are well-known for antibacterial activity, so bactericidal properties of synthesized monoliths are tested against E. coli and B. subtilis bacteria by minimum inhibitory concentration method (MIC). The calculated EC50 (half maximum effective concentration) after completion of incubation period, against E. coli and B. subtilis were 22.87 ± 0.015 and 23.33 ± 0.09 respectively using Ag/Cu-3 bimetallic monolith.
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      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.023
       
  • Synthesizing amorphous Ni-P micro-/nano-composites with perfect roundness
           or embryo-like structures
    • Authors: Meifeng Hao; Mingshu Xiao; Yuhua Yan; Yuqing Miao
      Abstract: Publication date: Available online 9 October 2017
      Source:Advanced Powder Technology
      Author(s): Meifeng Hao, Mingshu Xiao, Yuhua Yan, Yuqing Miao
      The ability to manipulate the morphology and structure of core-shell materials on a micro/nano scale can further control their physical and chemical properties, leading to the wider applications. Herein, the conventional electroless deposition technique for metal alloy films on solid substrates was adapted to synthesize the Ni-P micro/nano-composites in solution under high temperature and high pressure through the hydrothermal method. The obtained amorphous Ni-P composites exhibit perfect roundness with the multilayer structure of concentric circle. By controlling the erosion condition in HNO3, the special embryo-like structure was obtained where a solid microsphere is encircled by a layer of hollow globular ultrathin film with the thickness smaller than 50 nm. A round hole opens on the surface of the embryo-like structure. The reaction or formation mechanism was tentatively discussed. The methods can be used to produce the special micro-/nano-structures of metal phosphide.
      Graphical abstract image

      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.025
       
  • A comprehensive study of the performance of a heat pipe by using of
           various nanofluids
    • Authors: Hossein Kavusi; Davood Toghraie
      Abstract: Publication date: Available online 7 October 2017
      Source:Advanced Powder Technology
      Author(s): Hossein Kavusi, Davood Toghraie
      In this paper, a two-dimensional numerical model is developed to simulate the performance of a heat pipe using various nanofluids. The effect of different nanofluids (prepared using alumina, copper oxide, and silver nanoparticles) at different concentrations and particle diameters on the performance of heat pipe is also studied by through finite volume method. The obtained results show that using a nanofluid instead of water leads to the increased thermal efficiency and reduction in heat at wall of the heat pipe. Also, the temperature difference between the evaporator and the condenser is a function of input power; this means that by an increase in the input capacity, the temperature difference between the evaporator and the condenser increases. It was observed that the use of nanofluid reduces the axial-flow pressure of the fluid inside the wick. As a result, the transmission of fluid flow inside the wick from the condenser to the evaporator is easily done with the cost of using a nanofluid. Moreover, with an increase in thermal capacity, fluid pressure drop becomes maximum and thus temperature difference between the evaporator and the condenser increases.
      Graphical abstract image

      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.022
       
  • Experimental investigation on the wettability of respirable coal dust
           based on infrared spectroscopy and contact angle analysis
    • Authors: Hetang Wang; Lin Zhang; Deming Wang; Xinxin He
      Abstract: Publication date: Available online 5 October 2017
      Source:Advanced Powder Technology
      Author(s): Hetang Wang, Lin Zhang, Deming Wang, Xinxin He
      Respirable dust does great harm to human health. In this paper, we focused on the wetting characteristics of respirable coal dust, and the effect of functional groups of respirable coal dust on its wettability was investigated. We selected five different types of coal samples (Lignite, Gas fat coal, Coking coal, 1/3 Coking coal, and Anthracite) from some typical mining areas in China. We used a Fourier Transform Infrared Spectrometer (FT-IR) to obtain the IR spectrum of the respirable coal dust, and the percentage of functional groups for each respirable coal dust was obtained by the peak area normalization method and then analyzed. And the wettability of respirable coal dust was evaluated by contact angle measurement. It is found that the benzene rings, aromatic hydrocarbons with benzene rings, aliphatic hydrocarbons with methyl, methylene, and so on, which have carbon-containing macromolecular structures, are hydrophobic. While the oxygen-containing functional groups represented by hydroxyl and carboxyl groups, and silicates and carbonate minerals are hydrophilic. Besides, the results show that respirable coal dust of different metamorphic grade coals has different wettability. This study has important theoretical significance for understanding the wettability of respirable coal dust.
      Graphical abstract image

      PubDate: 2017-10-12T06:48:45Z
      DOI: 10.1016/j.apt.2017.09.018
       
  • Core/shell structured sSiO2/mSiO2 composite particles: The effect of the
           core size on oxide chemical mechanical polishing
    • Authors: Yang Chen; Changzhi Zuo; Ailian Chen
      Abstract: Publication date: Available online 3 October 2017
      Source:Advanced Powder Technology
      Author(s): Yang Chen, Changzhi Zuo, Ailian Chen
      In a typical chemical mechanical polishing (CMP) process, the type, morphology, structure, mechanical, and surface characteristics of abrasive particles play an important role in influencing the material removal process. The novel abrasive particles with special mechanical and/or tribochemical properties have been introduced into CMP processes for the improvement of surface quality and finishing efficiency. In this work, the composite particles containing solid silica (sSiO2) cores and mesoporous silica (mSiO2) shells were prepared via a developed Stöber method using cetyltrimethylammonium bromide as a structure-templating surfactant. The as-synthesized core/shell structured sSiO2/mSiO2 composite particles were characterized by powder X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and nitrogen sorption–desorption measurements. The effect of the sSiO2 core size of the composite particles on oxide CMP performance was evaluated in terms of surface roughness and material removal rate (MRR). The root-mean-square surface roughness (0.15–0.31nm) of the polished substrates slightly increased with increasing of the sSiO2 core size (168–353nm) of the composites with a comparable mSiO2 shell thickness (16–18nm). The sSiO2/mSiO2 composite particles with a relatively smaller or larger core presented a relatively high MRR for silicon oxide films. These oxide CMP results could be rationalized according to the contact area mechanism and indentation-based mechanism, incorporating the total contact area and chemical reactivity between particles and wafers, and the indentation depth of an abrasive particle onto the substrate surface.
      Graphical abstract image

      PubDate: 2017-10-05T00:00:15Z
      DOI: 10.1016/j.apt.2017.09.020
       
  • Fabrication of fine-grained spherical tungsten powder by radio frequency
           
    • Authors: Rui Li; Mingli Qin; Hua Huang; Chengcheng Liu; Zheng Chen; Min Huang; Lin Zhang; Xuanhui Qu
      Abstract: Publication date: Available online 3 October 2017
      Source:Advanced Powder Technology
      Author(s): Rui Li, Mingli Qin, Hua Huang, Chengcheng Liu, Zheng Chen, Min Huang, Lin Zhang, Xuanhui Qu
      Fine-grained spherical tungsten powder with particle size from 6μm to 11μm has been fabricated by a well-designed method with two simple steps. A pretreatment of tungsten powder was carried out in the first step. Complete dispersion, effective classification and favorable shape modification have been achieved by jet milling process. Accordingly, monodisperse tungsten powders with narrow particle size distribution were obtained. On the basis of the existing calculation and simulation results, plasma spheroidization parameters have been optimized. Thus, fine-grained spherical tungsten powder with narrow particle size distribution has been prepared by subsequent radio frequency (RF) inductively coupled plasma spheroidization. Furthermore, the presented method can be useful in fabricating spherical tungsten powder of different particle size with narrow particle size distribution as well as for process control in large-scale continuous production.
      Graphical abstract image

      PubDate: 2017-10-05T00:00:15Z
      DOI: 10.1016/j.apt.2017.09.019
       
  • Inside Front Cover (Aims &amp; Scope, Editors)
    • Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10


      PubDate: 2017-09-27T16:52:13Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10


      PubDate: 2017-09-27T16:52:13Z
       
  • Grinding kinetics of red grape seed residue in stirred media mill
    • Authors: Mucsi
      Abstract: Publication date: October 2017
      Source:Advanced Powder Technology, Volume 28, Issue 10
      Author(s): Gábor Mucsi, Ádám Rácz
      The main objective of the present paper was to experimentally investigate the grinding kinetics of red grape seed which is the by-product of winery and juice industry. Stirred media mill was used as a high energy density mill to improve the raw grape seed fineness, i.e. mean particle size approx. 10µm using various rotor circumferential velocities under dry condition. The effect of stress intensity and stress number on the particle size distribution of ground grape seed was investigated. Optimum conditions (rotor velocity and residence time) were determined, mean particle size close to 10µm and 5000cm2/g geometric specific surface area were reached within the studied variables. Additionally, concerning the material structure, FTIR measurements of the ground grape seed samples were carried out which demonstrated that no structural changes were detected. Furthermore, the specific grinding work was measured for each test, in this way energy utilization, efficiency was determined.
      Graphical abstract image

      PubDate: 2017-09-27T16:52:13Z
       
 
 
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