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Publisher: Elsevier   (Total: 3123 journals)

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Showing 1 - 200 of 3120 Journals sorted alphabetically
A Practical Logic of Cognitive Systems     Full-text available via subscription   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 26, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 22, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 90, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 25, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 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: 378, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 26, 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   (Followers: 1, SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 237, 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: 25, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 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: 5)
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: 7)
Additive Manufacturing     Hybrid Journal   (Followers: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 22)
Advanced Cement Based Materials     Full-text available via subscription   (Followers: 3)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 138, 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: 27, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 4)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 9, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 12, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 23, 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: 26, 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: 6, SJR: 2.139, h-index: 42)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 4)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 13)
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: 12)
Advances in Digestive Medicine     Open Access   (Followers: 7)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 6)
Advances in Drug Research     Full-text available via subscription   (Followers: 23)
Advances in Ecological Research     Full-text available via subscription   (Followers: 47, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 27, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 9)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 46, 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: 52, 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: 17, 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 Human Factors/Ergonomics     Full-text available via subscription   (Followers: 27)
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: 36, 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 Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 10)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 5, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 23)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 9, 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: 2)
Advances in Organ Biology     Full-text available via subscription   (Followers: 2)
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: 16, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 7)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20, SJR: 1.5, h-index: 62)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.1, h-index: 2)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 5)
Advances in Space Research     Full-text available via subscription   (Followers: 371, 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: 9, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 31, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 16)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 6, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 45, 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: 339, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 9, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 432, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 31, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 42, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 3)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 56, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 11, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 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   (Followers: 1)
Algal Research     Partially Free   (Followers: 9, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 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: 9, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 49, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 4)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 5)
American Heart J.     Hybrid Journal   (Followers: 48, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 48, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 42, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 9, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 32, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 26, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 31, 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: 207, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 61, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 6)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 24, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 27, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 26, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 36, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 6)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 60, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 14)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 4, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 36, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 171, 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: 12)
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: 176, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)

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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  [3123 journals]
  • Synthesis and characterization of solar photoactive TiO2 nanoparticles
           with enhanced structural and optical properties
    • Authors: Rohini Singh; Suman Dutta
      Pages: 211 - 219
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Rohini Singh, Suman Dutta
      The structural, morphological, and optical properties of the sol–gel derived TiO2 nanoparticles at different pH and calcination temperature were investigated in the present study. X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), UV–Visible(Vis) spectroscopy, energy dispersive studies (EDS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoluminescence (PL) spectroscopy, BET surface area analysis, and Barrett-Joyner-Halenda (BJH) pore size distribution and pore volume analysis were used to characterize the prepared TiO2 photocatalyst. The range of crystallite size and band gap of the synthesized TiO2 samples were in the range of 20–80 nm and 2.5–3.2 eV respectively. The photocatalytic performance of prepared TiO2 photocatalysts was evaluated by photodegradation of Methylene Blue (MB) solution under simulated solar irradiation. Results illustrate that the synthesized TiO2 exhibits visible light activity at higher calcination temperature. Crystallinity and surface area plays a vital role in the overall performance of the prepared TiO2 photocatalyst.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.005
       
  • Synthesis and characterization of silicon oxide nanoparticles using an
           atmospheric DC plasma torch
    • Authors: Franklin Chau-Nan Hong; Cyun-Jhe Yan
      Pages: 220 - 229
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Franklin Chau-Nan Hong, Cyun-Jhe Yan
      An atmospheric pressure DC plasma torch reactor was employed using Hexamethyldisiloxane (HMDSO) and oxygen reactants in nitrogen carrier gas to produce silicon oxide nanoparticles and nanoparticle agglomerates with the diameters in the ranges of 8–14 nm and 130–260 nm, respectively. The mean sizes of primary nanoparticles and nanoparticle agglomerates as well as their surface properties are studied by varying the process conditions. In general the mean sizes of primary nanoparticles and nanoparticle agglomerates decrease with the increase of the plasma torch power, the increase of the oxygen concentration, and the decrease of the HMDSO concentration. Under those conditions, the more completely-oxidized silicon oxide clusters are formed and aggregate into the compact, densely-packed, and small-size primary silicon oxide nanoparticles, which further agglomerate into the densely-packed, small nanoparticle agglomerates. The hydrophilic and white nanoparticle powder with a low BET surface area can be thus obtained. Under the opposite processing conditions, the loosely-packed, low density and large-size carbon-containing silicon oxide nanoparticles and nanoparticle agglomerates can be obtained with hydrophobic surface, high BET surface areas, and gray color.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.006
       
  • Effects of air volume ratio parameters on air curtain dust suppression in
           a rock tunnel’s fully-mechanized working face
    • Authors: Hao Wang; Wen Nie; Weimin Cheng; Qiang Liu; Hu Jin
      Pages: 230 - 244
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Hao Wang, Wen Nie, Weimin Cheng, Qiang Liu, Hu Jin
      To investigate the effects of the air volume ratio parameters (axial-to-radial flow ratio of the wall-attached air cylinder “δ” and the forced-to-exhaust ratio of the ventilation system “β”) on the air curtain dust suppression in a rock tunnel’s fully-mechanized working face, the eastern belt fully-mechanized working face in Huipodi mining company (Shanxi Mineral Group Co., Ltd., China) was numerically simulated by CFD software in this study. First, a mathematical model for describing the airflow-dust migration in a fully-mechanized working face was established using the Euler-Lagrange method. A full-scale geometrical model of the tunnel was also developed. The effectiveness of the established models and the related parameter settings were then verified by making comparisons between the field measured values and the numerical simulation results. Finally, the airflow migration and dust dispersion rules under different ventilation conditions (δ = 5:5–1:9 and β = 0.5–1.5) were simulated. According to the simulation results, a decrease in δ and β contributed to the formation of an effective axial dust-suppression air curtain in the fully-mechanized excavating region. For eastern belt fully-mechanized working face and those under similar production conditions, an effective axial dust-suppression air curtain can be formed when δ = 1:9–2:8 and β = 0.5–0.75. When δ = 1:9 and β = 0.5–0.75, the high-concentration dust were blocked in the space in front of the driver of heading machine (i.e., within 7 m from the head-on section), which achieved a better dust suppression effect.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.007
       
  • Functionalized core-shell nanostructures with inherent magnetic character:
           Outperforming candidates for the activation of PMS
    • Authors: Ankita Goyal; Rajat Sharma; S. Bansal; K.B. Tikoo; V. Kumar; Sonal Singhal
      Pages: 245 - 256
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Ankita Goyal, Rajat Sharma, S. Bansal, K.B. Tikoo, V. Kumar, Sonal Singhal
      With a view to engender an advanced oxidation protocol, in the present investigation a very efficient and outperforming catalytic system has been developed which employs peroxymonosulphate (PMS) as oxidant and surface metal functionalized core-shell nanostructures (with ferrite as core coated with shell of dopamine and surface functionalized with transition metal nanoparticles) as catalysts. The present protocol bids fast and facile degradation of organic pollutants without the aid of any promoting radiations. Every component of the developed core-shell nanostructures (M@Dop@CoFe; M = Cr, Mn, Fe, Co, Ni, Cu and Zn) has been found to contribute synergistically in the overall oxidative-degradation process. Co@Dop@CoFe presented the best results for the oxidative-degradation of nitrophenols (NP) taken as model pollutants with rate constant values of 8.13 × 10−1 min−1, 3.56 × 10−1 min−1 and 17.15 × 10−1 min−1 for 2-NP, 3-NP and 4-NP respectively. The synthesized core-shell nanocatalysts have been established to be leach-proof and recyclable to a very good extent.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.008
       
  • X-ray diffraction, Mössbauer spectrometry and thermal studies of the
           mechanically alloyed (Fe1−xMnx)2P powders
    • Authors: S. Alleg; A. Brahimi; S. Azzaza; S. Souilah; M. Zergoug; J.J. Suňol; J.M. Greneche
      Pages: 257 - 265
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): S. Alleg, A. Brahimi, S. Azzaza, S. Souilah, M. Zergoug, J.J. Suňol, J.M. Greneche
      (Fe1−xMnx)2P phosphide powders in the composition range 0.15 ≤ x ≤ 0.75 have been mechanically alloyed and their structural, magnetic and thermal changes with composition have been investigated by means of X-ray diffraction, 57Fe Mössbauer spectrometry, magnetization measurements and differential scanning calorimetry. The milling process induces changes in the crystal phase diagram of the (Fe1−xMnx)2P system. The XRD results reveal the coexistence of a bcc Fe(Mn)-type, hexagonal (Fe2P and Mn2P-type), orthorhombic (MnP-type) and tetragonal Fe3P-type structures for all compositions. The room temperature Mössbauer spectra confirm the formation of the Fe(Mn)-type, non-stoichiometric Fe2P-type, FeP-type and Fe3P-type structures. Saturation magnetization exhibits a comparable behavior to that of the average hyperfine magnetic field. The DSC scans show the existence of several endothermic and exothermic peaks in the temperature range (100–700) °C related to different phase transitions. The endothermic peak at about 582–589 °C can be related to the ferromagnetic/paramagnetic transition temperature (Curie temperature, T C ) of the Fe(Mn)-type structure.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.009
       
  • Temperature-responsive Pickering foams stabilized by
           poly(N-isopropylacrylamide) nanogels
    • Authors: Yosuke Horiguchi; Hidetaka Kawakita; Keisuke Ohto; Shintaro Morisada
      Pages: 266 - 272
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Yosuke Horiguchi, Hidetaka Kawakita, Keisuke Ohto, Shintaro Morisada
      Poly(N-isopropylacrylamide) (PNIPAM) nanogels were synthesized by emulsion polymerization using sodium dodecyl sulfate (SDS). After removal of SDS by dialysis, the surface tensions of the PNIPAM nanogel aqueous dispersions were measured at various temperatures by the pendant-drop method, and it was found that the surface tensions of the nanogel dispersion below the lower critical solution temperature (LCST) of PNIPAM were much smaller than those of water and comparable to those of the SDS aqueous solution. The stability of the aqueous foams generated by nitrogen bubbling thorough the PNIPAM nanogel dispersion was investigated below and above the LCST of PNIPAM. The foam prepared below the LCST was stable in some degree, whereas almost no foam was formed above the LCST. Moreover, the foam prepared below the LCST was quickly collapsed by changing the temperature above the LCST. This rapid defoaming represents that the surface activity of the PNIPAM nanogel can be switched off by the temperature increase across the LCST.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.010
       
  • Investigation of turbulent heat transfer and nanofluid flow in a double
           pipe heat exchanger
    • Authors: Mohammad Hussein Bahmani; Ghanbarali Sheikhzadeh; Majid Zarringhalam; Omid Ali Akbari; Abdullah A.A.A. Alrashed; Gholamreza Ahmadi Sheikh Shabani; Marjan Goodarzi
      Pages: 273 - 282
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Mohammad Hussein Bahmani, Ghanbarali Sheikhzadeh, Majid Zarringhalam, Omid Ali Akbari, Abdullah A.A.A. Alrashed, Gholamreza Ahmadi Sheikh Shabani, Marjan Goodarzi
      In present study, heat transfer and turbulent flow of water/alumina nanofluid in a parallel as well as counter flow double pipe heat exchanger have been investigated. The governing equations have been solved using an in-house FORTRAN code, based on finite volume method. Single-phase and standard k-ε models have been used for nanofluid and turbulent modeling, respectively. The internal fluid has been considered as hot fluid (nanofluid) and the external fluid, cold fluid (base fluid). The effects of nanoparticles volume fraction, flow direction and Reynolds number on base fluid, nanofluid and wall temperatures, thermal efficiency, Nusselt number and convection heat transfer coefficient have been studied. The results indicated that increasing the nanoparticles volume fraction or Reynolds number causes enhancement of Nusselt number and convection heat transfer coefficient. Maximum rate of average Nusselt number and thermal efficiency enhancement are 32.7% and 30%, respectively. Also, by nanoparticles volume fraction increment, the outlet temperature of fluid and wall temperature increase. Study the minimum temperature in the solid wall of heat exchangers, it can be observed that the minimum temperature in counter flow has significantly reduced, compared to parallel flow. However, by increasing Reynolds number, the slope of thermal efficiency enhancement of heat exchanger gradually tends to a constant amount. This behavior is more obvious in parallel flow heat exchangers. Therefore, using of counter flow heat exchangers is recommended in higher Reynolds numbers.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.013
       
  • Controlled synthesis of dense MgFe2O4 nanospheres by ultrasonic spray
           pyrolysis technique: Effect of ethanol addition to precursor solvent
    • Authors: Harinarayan Das; Nipa Debnath; Atsuki Toda; Takahiko Kawaguchi; Naonori Sakamoto; Sheikh Manjura Hoque; Kazuo Shinozaki; Hisao Suzuki; Naoki Wakiya
      Pages: 283 - 288
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Harinarayan Das, Nipa Debnath, Atsuki Toda, Takahiko Kawaguchi, Naonori Sakamoto, Sheikh Manjura Hoque, Kazuo Shinozaki, Hisao Suzuki, Naoki Wakiya
      We present the results of controlled synthesis of spherical shape magnesium ferrite (MgFe2O4) dense nanoparticles by using ultrasonic spray pyrolysis (USP) method without any post-annealing processes. A new strategy was proposed to improve nano-crystallinity and observed morphology by ethanol (EtOH) addition in the initial precursor solution of MgFe2O4. Influence of EtOH, not only decrease the synthesized secondary particle size but also enhancing crystallization into MgFe2O4 single phase cubic structure. We observe that average nanosphere size decrease from 220 to 189 nm but increases of crystallite size from 9.6 to 19.2 nm with increasing the amount of EtOH from 0 to 20 vol%. Also, surface morphology revealed that nanospheres with some irregular shape and rough surface appear in case of EtOH additives. The magnetic properties are studied and different parameters viz. saturation magnetization, remanence, and coercivity have been correlated with crystallite size.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.014
       
  • Preparation and electromagnetic wave absorption properties of hollow Co,
           Fe@air@Co and Fe@Co nanoparticles
    • Authors: Peipei Yang; Xiuchen Zhao; Ying Liu; Xianhua Lai
      Pages: 289 - 295
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Peipei Yang, Xiuchen Zhao, Ying Liu, Xianhua Lai
      In this study, hollow Co, Fe@air@Co and Fe@Co nanoparticles (NPs) have been synthesized respectively by electroless plating Co shell on Fe core and controlling reaction time based on galvanic cell reaction between Co shell and Fe core in hydrochloric acid at room temperature. The electromagnetic (EM) wave absorption properties of these three NPs are also been investigated. The results indicate that the relationship between Fe core and Co shell is critical to the EM wave absorption properties of hollow Co, Fe@air@Co and Fe@Co nanoparticles when blended with 70 wt% in paraffin-based samples. Fe@air@Co nanoparticles shows the best EM wave absorption properties with minimum reflection loss of −42.75 dB and effective bandwidth of 4.1 GHz under −10 dB. The present work has a significant potential for the development of EM wave absorbing materials with core-shell structure.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.015
       
  • Microwave synthesis of titanium-containing carbon nanosheet over
           mesostructured cellular foam and the catalytic application
    • Authors: Benhua Huang; Cheng Pan; Xiaoyong Li; Chao Fan; Yu Li; Xue Bai; Donghua Zhang; Aqun Zheng; Yang Sun
      Pages: 296 - 309
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Benhua Huang, Cheng Pan, Xiaoyong Li, Chao Fan, Yu Li, Xue Bai, Donghua Zhang, Aqun Zheng, Yang Sun
      Titanium-containing carbon nanosheets have been prepared from graphite powder, titanocene dichloride, pyrrole and other components by using mesostructured cellular foam (MCF) as template under microwave irradiation. Characterizations reveal the present nanosheets have similar composition, functional group and thickness as classical graphene oxide, but they are probably formed by stitching of tiny carbon fibers those grown from pores of MCF. Meanwhile, titanium oxides appear on nanosheets, making a new catalytic system. In oxidation of alkenes, synthetic materials provide satisfactory conversions and promising stereoselectivities. Moreover, various oxidized products are obtained as key intermediates for synthesis of high-value-added chemicals. On the other hand, encouraging conversions and chiral inductions are realized in diethylzinc addition to benzaldehyde. Catalytic results also propose the synergy of MCF with attached chiral additive in chiral induction. This work not only provides a new method to produce two-dimensional carbon materials, but also shows their potentials for catalytic transformation of hydrocarbons, which would contribute to the design of new heterogeneous catalysts.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.016
       
  • Testing steady and transient velocity scalings in a silo
    • Authors: L.A. Fullard; C.E. Davies; A.C. Neather; E.C.P. Breard; A.J.R. Godfrey; G. Lube
      Pages: 310 - 318
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): L.A. Fullard, C.E. Davies, A.C. Neather, E.C.P. Breard, A.J.R. Godfrey, G. Lube
      Gravity-driven discharge experiments were performed in a perspex 3D flat bottomed silo which was filled with a granular material, and had a variable discharge orifice size. The granular material used was amaranth seed with an average diameter of 1 mm. Particle Image Velocimetry (PIV) analysis was performed on a high-speed video recording of the discharge, and used to quantify the velocity field within the silo both at steady state and during the development of flow. We verified not only that the steady-state velocity of the granules in the silo scales with the flow rate, but, additionally, the transition to a steady-state regime is also rate-controlled by the volumetric discharge. We present evidence that, away from the discharge orifice, the flow behaves identically, regardless of the orifice diameter, in a scaled time. We discuss these results with reference to the physics and mathematical modelling of granular flows.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.017
       
  • One step pyridine-assisted synthesis of visible-light-driven photocatalyst
           Ag/AgVO3
    • Authors: Junhui Yi; Jiaxing Song; Huimei Mo; Yupeng Yang
      Pages: 319 - 324
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Junhui Yi, Jiaxing Song, Huimei Mo, Yupeng Yang
      Ag/AgVO3 nanorods have been obtained for the first time by one step hydrothermal method with the contribution of pyridine. The prepared sample was systematically characterized. Their photocatalytic properties were investigated by degrading acid orange II (AO-II) under visible light. Compared with pure AgVO3, Ag/AgVO3 nanorods showed much higher photocatalytic activity and stability. The enhanced photocatalytic activity was attributed to Ag nanoparticles (NPs) with a strong surface plasmon resonance (SPR). Further studies indicate that the photogenerated holes (h+) and superoxide radical anions ( O2 −) were major active species. Ag/AgVO3 nanorods has a huge potential application in wastewater treatment.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.018
       
  • Enhanced structural and optical properties of ZnO nanopowder with tailored
           visible luminescence as a function of sodium hydroxide to zinc sulfate
           mass ratio
    • Authors: Majdi Kahouli; Nabil Tounsi; Nissaf Mzabi; Hajer Guermazi; Samir Guermazi
      Pages: 325 - 332
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Majdi Kahouli, Nabil Tounsi, Nissaf Mzabi, Hajer Guermazi, Samir Guermazi
      ZnO nanopowders of tailored particle sizes were synthesized using a simple wet chemical method, by controlling the mass ratio of the precursors. The physical properties were investigated as a function of OH − /Zn2+ mass ratio (x). The structural properties of the synthesized nanoparticles (NPs) are studied using X-ray diffraction (XRD). XRD patterns show pure wurtzite structure. Microstructural parameters dependence on x ratio was studied based on Williamson-Hall model. We notice an increase in crystallite size (17–24 nm) and a decrease in strain values when the x ratio increases (0.5–1.4). The best crystallinity corresponds to the higher mass ratio. Indeed, for x = 1.4 we obtain the largest crystallite size, the lowest strain and stacking faults. The TEM images support the XRD results. Raman spectra confirm the purity of the synthesized ZnO powder. Furthermore, the optical properties were examined by UV–vis and Photoluminescence as a function of precursor’s ratio. Absorption data show a band gap red-shift of the ZnO-NPs with increase in particle’s size. Moreover, we found that the ZnO-NPs luminescence in the visible range can be engineered by changes of x ratio. This constitutes an advantage for the use of ZnO-NPs in different wavelength areas in optoelectronic applications covering UV-Blue-Green domain for the LED design, sensors…
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.019
       
  • Effect of mechanical activation on thermal energy storage properties of
           Co3O4/CoO system
    • Authors: Nariman Nekokar; Mehdi Pourabdoli; Ahmad Ghaderi Hamidi; Deniz Uner
      Pages: 333 - 340
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Nariman Nekokar, Mehdi Pourabdoli, Ahmad Ghaderi Hamidi, Deniz Uner
      The heat produced by a solar receiver during on-sun operation can be employed to drive the endothermic reduction reaction of Co3O4 to CoO; then the consumed thermal energy can be recovered completely by the exothermic reverse oxidation reaction of CoO to Co3O4 which can take place during off-sun operation. In this research, the effect of mechanical activation duration (1, 2, 4, 8, and 16 h) on thermal energy storage by Co3O4/CoO redox pair was investigated. It was found that increasing the mechanical activation duration increases the sintering and particle size of the cobalt oxide powder after one cycle redox, and subsequently the thermal energy storage properties are declined. The weight loss was about 4–5 wt.% for samples heated by 1, 3, and 5  ° C /min, while it was about 2 wt.% for 10  ° C /min heating rate and less than 1 wt.% for 15  ° C /min heating rate. The comparison of cycleability of as-received and 1 h mechanical activated cobalt oxide showed that mechanical activation weakens the cycleability of redox reactions of cobalt oxide. The as-received cobalt oxide cycleability continued up to three cycles, although the reduction and oxidation capacities gradually declined. The cycleability of 1 h mechanical activated sample entirely diminished after two cycles.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.020
       
  • Improved photodynamic efficiency for methylene blue from silica-methylene
           blue@tannic acid-Fe(III) ions complexes in aqueous solutions
    • Authors: Wenhao Wang; Lishuang Yang; Haibin Sun; Zanzhong Yang; Qingyang Du; Chengfeng Li
      Pages: 341 - 348
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Wenhao Wang, Lishuang Yang, Haibin Sun, Zanzhong Yang, Qingyang Du, Chengfeng Li
      To avoid multidrug resistance and tumour recurrence, photodynamic therapy (PDT) was emerging as an alternative therapy and its efficiency was related to photosensitizer (PS) efficiency, oxygen concentration and light characteristic. Methylene blue (MB) molecules as PSs were loaded in silica (silica-MB) and followed by encapsulation by coordination complexes of tannic acid (TA) and Fe(III) ions. In comparison with those of silica-MB, decreased condensation of Si-O-Si, shifted infrared absorbance frequencies of chemical bands, delayed thermal degradation and modulated release behavior of MB were observed for silica-MB@TA with a core–shell structure. Although MB dimers were dominantly released from silica-MB, release of MB monomers from silica-MB@TA was significantly promoted, which was described by the Higuchi model. The promotion of release of MB monomers from silica-MB@TA indicated the well control of aggregate states of MB by the encapsulation of TA and Fe(III) ions complexes. Through monitoring the oxidation of uric acid, generation efficiency of singlet oxygen (1O2) by MB released from silica-MB@TA was fairly higher than that from silica-MB. A facile method to encapsulate silica-MB with complexes of TA and Fe(III) ions was herein demonstrated to raise the generation efficiency of singlet oxygen.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.021
       
  • Effect of Magnetized Ethanol on the Shape Evolution of Zinc Oxide from
           Nanoparticles to Microrods: Experimental and Molecular Dynamic Simulation
           Study
    • Authors: Hamed Rashidi; Ali Ahmadpour; Mostafa Gholizadeh; Fatemeh F. Bamoharram; Fatemeh Moosavi
      Pages: 349 - 358
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Hamed Rashidi, Ali Ahmadpour, Mostafa Gholizadeh, Fatemeh F. Bamoharram, Fatemeh Moosavi
      In the current research, ethanol was exposed to an external magnetic field, called magnetized ethanol, and then, used as a solvent in the solvothermal method to synthesize various ZnO structures. Moreover, the morphologies of the synthesized structures are compared with those obtained using ordinary ethanol. The attained results evidently demonstrated the formation of ZnO nanoparticles and microrods by using ordinary and magnetized ethanol, respectively. Moreover, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized for characterizing the synthesized ZnO structures. The XRD results demonstrated that the synthesized products are in Zincite hexagonal phase. Besides, molecular dynamics simulation suggested that the molecular mobility is diminished upon using the magnetic field. It was found that the interactions among ZnO particles were enhanced by the slight increase in the magnetic field while the number of interactions between ZnO and solvent was reduced revealing the magnetic-field-induced particle growth from the molecular level insight.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.022
       
  • Phase evolution and microstructure characteristics of Mo-based Tb2O3-Dy2O3
           composites synthesized by ball milling and sintering
    • Authors: Yizhen Wu; Guang Ran; Wei Zhou; Dong Lv; Chao Ye; Ning Li; Qiang Shen; Peihua Yang
      Pages: 359 - 366
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Yizhen Wu, Guang Ran, Wei Zhou, Dong Lv, Chao Ye, Ning Li, Qiang Shen, Peihua Yang
      Mo-based Tb2O3-Dy2O3 composites used as neutron absorbers in nuclear power reactor were synthesized by powder metallurgy. The comparative studies of Mo-based Tb2O3 and Mo-based Dy2O3 composites were carried out to deeply understand the phase evolution and microstructure characteristics of Mo-based Tb2O3-Dy2O3 composites. Ball milling induced terbium oxide and dysprosium oxide in the powder mixtures to be first fined, nano-crystallized, amorphized and finally dissolved into Mo matrix to form the supersaturated nanocrystalline solid solution that was driven by mechanical work, not by negative heat of mixing. Mo lattice parameter increased with increasing ball-milling time, opposite for Mo grain size. A phase transformation of Dy2O3 crystal from cubic to monoclinic and then to amorphous was observed during ball milling. The microhardness of sintered bulks was first increased and then decreased with increasing sintering time. The maximum value was obtained at the bulks sintered for 8 h. The microhardness and bulk density were increased with increasing sintering temperature before 1600 °C. The mechanism of ball milling and sintering was also discussed.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.023
       
  • Influence of Egyptian nanoilmenite/amorphous silica composite particles on
           the electrochemical and mechanical properties of cold galvanizing
           formulation coatings
    • Authors: A.M. Al-Sabagh; M.I. Abdou; M.A. Migahed; A.M. Fadl; M.F. El-Shahat
      Pages: 367 - 379
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): A.M. Al-Sabagh, M.I. Abdou, M.A. Migahed, A.M. Fadl, M.F. El-Shahat
      In the present work, Egyptian ilmenite nanoparticles (FeTiO3 NPs) were obtained with the average diameters of 20 nm by a direct solid-phase milling process and synthesized amorphous silica powder grains were processed to prepare a novel fabricated Egyptian nanoilmenite/amorphous silica composite (ENI/AS) particles. Flaky-like nature of ENI/AS and the spherical shape of Zn-dust particles were emphasized by scanning electron microscopic (SEM) micrographs. The nano features of ENI/AS particles were confirmed by transmission electron microscope (TEM) investigation. Various alkyd-based cold galvanizing coating formulations were modified using different uniformly dispersing amounts of the processed ENI/AS particles as a modifier to form some nanocomposite coatings. The electrochemical behavior of nanocomposite modified coated steel films in oil-wells formation water solution have been studied by both potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The mechanical properties of the coated films were studied through some coating tests as cross-cut adhesion, bend and impact to assert their application efficiency. Scanning electron microscope (SEM) technique was utilized to survey the protective film formed on the carbon steel surface by these modified coatings in formation water solution. The results of this study reinforced remarkable corrosion protection properties of ENI/AS modified cold galvanizing coating.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.024
       
  • Increasing the amorphous yield of {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4
           powders by hot gas atomization
    • Authors: N. Ciftci; N. Ellendt; E. Soares Barreto; L. Mädler; V. Uhlenwinkel
      Pages: 380 - 385
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): N. Ciftci, N. Ellendt, E. Soares Barreto, L. Mädler, V. Uhlenwinkel
      The synthesis of metallic glasses requires high cooling rates leading to product size limitations of a few millimeters when using conventional casting techniques. One way to overcome these size limitations is powder metallurgy. Melt atomization and the subsequent powder processing can result in larger, amorphous components as long as no crystallization takes place during powder consolidation. An iron-based glass-forming alloy {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 was formed through both ambient room and high temperature inert gas atomization at various melt flow rates (close-coupled atomization). The use of hot gas generally decreases the droplet size and hence leads to an increased cooling rate and amorphous fraction of the atomized powders. Hot gas atomization results in a lower gas consumption, a smaller gas-to-melt mass flow ratio (GMR), smaller particles and a smaller geometric standard deviation. Particles atomized in ambient temperature were fully amorphous up to a particle size fraction of 90 µm. Larger particle size fractions resulted in a higher crystalline fraction. According to the XRD and DSC analyses, hot gas atomization has only a very small influence on the cooling rate and the amorphous fraction. However, the amorphous yield is significantly increased using hot gas atomization.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.025
       
  • Computer simulation-based method to predict packing density of aggregates
           mixture
    • Authors: Mohammad Reisi; Davood Mostofinejad; Ali Akbar Ramezanianpour
      Pages: 386 - 398
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Mohammad Reisi, Davood Mostofinejad, Ali Akbar Ramezanianpour
      A key theory in concrete mix design is maximizing aggregate packing density (PD) of aggregate mixture. Different methods have been presented by researchers to estimate PD of aggregate mixture. One such method is computer simulation that has become increasingly common over the last decade; however, it is usually a time-consuming procedure. In the current study, a method based on computer simulation is proposed for estimating aggregate PD. In this method, aggregates with specific shapes, grading and PDs are substituted by monosized spherical aggregates. An equation is also presented for determining the diameter of equivalent monosized aggregates. The coefficient of friction between the equivalent monosized aggregates is determined in a way that the monosized aggregates will have a PD equal to that of actual aggregates. The proposed method is also used to simulate laboratory experiments conducted by the present authors and other researchers. Comparisons reveal the high accuracy of the proposed simple method in predicting the PD of aggregate mixtures.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.026
       
  • Mechanosynthesis of nanostructured composites copper-fullerite,
           copper-graphite
    • Authors: N.S. Larionova; R.M. Nikonova; V.I. Ladyanov
      Pages: 399 - 406
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): N.S. Larionova, R.M. Nikonova, V.I. Ladyanov
      Comparative studies of the influence of carbon allotropic form on the formation of the structural-phase composition of copper-based composites have been performed by means of Scanning Electron Microscopy, X-ray and Thermal analysis and Raman spectroscopy. It has been stated that the kinetics of solid state reactions in the systems Cu-C60/70 and Cu-Cg obtained in process of mechanosynthesis depend on deformational stability and oxidation-reduction properties of fullerite and graphite. It has been shown that partial destruction of fullerene molecules in the Cu-C60/70 sample results in the formation of an amorphous fullerite-like phase, copper oxide Cu2O, and supersaturated solid solution Cu(C, O). Total destruction of fullerene molecules in the system Cu-C60/70 results in the formation of supersaturated solid solution Cu(C), just like in the case of the composite Cu-Cg.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.027
       
  • A facile method to prepare size-tunable silver nanoparticles and its
           antibacterial mechanism
    • Authors: Yunping Wu; Yan Yang; Zhijie Zhang; Zhihua Wang; Yanbao Zhao; Lei Sun
      Pages: 407 - 415
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Yunping Wu, Yan Yang, Zhijie Zhang, Zhihua Wang, Yanbao Zhao, Lei Sun
      The antibacterial effect of silver nanoparticles (denoted as Ag NPs) is closely related to size. This could partly explain why size controllable synthesis ofAg NPs for bactericidal application is drawing much attention. Thus, we establish a facile and mild route to prepare size-tunable Ag NPs with highly uniform morphologies and narrow size distributions. The as-prepared Ag NPs with averaged sizes of 2, 12 and 32 nm were characterized by transmission electron microscopy (TEM), ultraviolet–visible absorption spectroscopy (UV–vis), X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The antimicrobial effect of the as-prepared Ag NPs with different particles size was assessed by broth dilution and disk diffusion as well as measurement of optical density (OD600). Moreover, their antibacterial mechanism was discussed in relation to morphology observation of microorganism by scanning electron microscopy (SEM) and to concentration detection of Ag+ by stripping voltammetry. It was found that the parameters such as reactant molar ratio, reaction time, dropping speed, and most of all, pH of the reactant solutions, have significant influences on size-regulation of Ag NPs. The as-prepared Ag NPs exhibit excellent antibacterial properties, and their antimicrobial activities increase with decreasing particles size. Besides, two kinds of mechanisms, i.e., contact action and release of Ag+, are responsible for the antimicrobial effect of Ag NPs.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.028
       
  • Impact of grinding aids on dry grinding performance, bulk properties and
           surface energy
    • Authors: P. Prziwara; S. Breitung-Faes; A. Kwade
      Pages: 416 - 425
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): P. Prziwara, S. Breitung-Faes, A. Kwade
      In dry fine grinding processes the relevance of particle-particle interactions rises with increasing product fineness. These particle-particle interactions reduce the grinding efficiency and complicate the process control. The adsorption of grinding aid molecules on the product particle surface is a common measure to handle these effects. To ensure an efficient grinding aid application, the impacts of additives on particle and bulk properties, which influence the micro-processes inside the mill, need to be understood. Within this study the effects of several grinding aids on dry fine grinding of limestone in a laboratory vibration mill were investigated. Unlike in many other scientific works, the impacts of grinding aids were analyzed on different levels simultaneously: Grinding success and agglomerate size distributions were evaluated by wet and dry particle size measurements, respectively. Additionally, material coating on the grinding media, powder flowabilities and particle specific surface energies were measured. It was shown that all of the investigated grinding aids influence the grinding efficiency. However, the formation of agglomerates is not necessarily linked to the product fineness. Furthermore, a strong impact of certain grinding aids on the flowability of the product powder was determined. Thereby, the bulk flow behavior also determines the grinding result as it affects the stress mechanism inside the mill. Moreover, a direct relation between surface energy and powder flowability as well as agglomeration behavior could be demonstrated.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.029
       
  • Numerical study of the motion behaviour of three-dimensional cubic
           particle in a thin drum
    • Authors: Nan Gui; Xingtuan Yang; Jiyuan Tu; Shengyao Jiang
      Pages: 426 - 437
      Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2
      Author(s): Nan Gui, Xingtuan Yang, Jiyuan Tu, Shengyao Jiang
      The motion of three-dimensional cubic particles in a thin rotating drum is simulated by the SIPHPM method. The drums with frictional or smooth front and rear walls, and the particles of cubic and spherical shapes, and different particle numbers are considered to study the effect of cubic particle shape, end-wall frictions and filling levels. Different flow patterns of cubic particles are observed, which are significantly dominated by the friction from the end-walls. The probability density function of velocity components, the flatness factors are used to analyze the motion behaviour of cubic particle. The Froude number, ensemble mean and time averaged particle velocities are also analyzed. A primary and secondary mode of driving from the end-wall frictions are indicated and the mechanisms on the influences of wall friction, particle shape and filling levels are fully explained.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.11.033
       
  • Synthesis of organic derived hydroxyapatite scaffold from pig bone waste
           for tissue engineering applications
    • Authors: Edwin A. Ofudje; Archana Rajendran; Abideen I. Adeogun; Mopelola A. Idowu; Sarafadeen O. Kareem; Deepak K. Pattanayak
      Pages: 1 - 8
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): Edwin A. Ofudje, Archana Rajendran, Abideen I. Adeogun, Mopelola A. Idowu, Sarafadeen O. Kareem, Deepak K. Pattanayak
      Micro porous hydroxyapatite (HAp) had drawn great attention in the field of tissue engineering due to its numerous applications such as tissue regeneration, dental, drug delivery, and adsorption and desorption of substances etc. The chemical synthesis of HAp is often faced with the high cost of starting materials and often lacks the presence of beneficial ions which can promote biological reactions. This paper examined a novel application of pig bone waste for the synthesis of HAp via heat treatment between 600 and 1000°C. Thus synthesized powder was characterized by X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDX) and Transmission electron microscopy (TEM). XRD results revealed the main characteristic peaks of single phase HAp powder, while the presence of various functional groups such as PO4 3−, CO3 2− and OH− corresponding to HAp were observed by FT-IR analysis. The elemental composition of as-synthesized HAp powder as observed by EDX showed the presence of Ca and P in addition to some beneficial metals such as Na, K, Mg and Si which plays vital roles in biological applications. SEM and TEM observation confirmed the microscopic sctructure of the as-synthesized HAp to be rod-like morphology with 38–52nm in length. Porous HAp scaffold up to 65% porosity could be prepared using ammonium bicarbonate as pore forming agent. Therefore, bio-waste such as pig bones can be utilized in the synthesis of porous hydroxyapatite scaffold which can serve as an alternative for the conventional chemical method.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.09.008
       
  • 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
      Pages: 18 - 26
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      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: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.09.020
       
  • 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
      Pages: 27 - 35
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      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.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.09.027
       
  • Effect of calcium carbonate particle size on formation and morphology of
           calcium hexaboride powder synthesized from condensed boric acid-poly(vinyl
           alcohol) product
    • Authors: Masaki Kakiage; Shuhei Shiomi; Tomoyo Ohashi; Hidehiko Kobayashi
      Pages: 36 - 42
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): Masaki Kakiage, Shuhei Shiomi, Tomoyo Ohashi, Hidehiko Kobayashi
      Calcium hexaboride (CaB6) powder was synthesized by carbothermal reduction via the transient boron carbide (B4C) formation starting from a condensed boric acid (H3BO3)-poly(vinyl alcohol) (PVA) product. The effect of the size of calcium carbonate (CaCO3) particles on the formation behavior of CaB6 and the obtained particle morphology was investigated in this study. CaB6 powder was prepared using CaCO3 powders with microsize or nanosize particles. The CaB6 formation reaction was accelerated at lower temperature and shorter heat treatment time when using nanosize CaCO3 particles. The complete formation of CaB6 was achieved at 1400 °C for 3 h in an Ar flow. Furthermore, CaB6 powder with nanosize particles was obtained. The precursor powder obtained using nanosize CaCO3 particles transiently formed fine B4C and calcium borate particles, which are reactive species of CaB6, leading to the facile formation of fine CaB6 particles.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.10.004
       
  • Multifunctional broad-band excited Eu3+-activated fluorescent materials
           for potential warm white light-emitting diodes (w-LEDs) and temperature
           sensor applications
    • Authors: Li Li; Peixin Yang; Wenxuan Chang; Xiaohua Tang; Chen Li; Ziyu Zeng; Sha Jiang; Xianju Zhou
      Pages: 43 - 49
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): Li Li, Peixin Yang, Wenxuan Chang, Xiaohua Tang, Chen Li, Ziyu Zeng, Sha Jiang, Xianju Zhou
      Discovery of novel multifunctional fluorescent materials are of great concern to the development of disciplinary crossing and integration. In this work, we prepared a broad-band Eu3+-activated Lu2MoO6 multifunctional material for potential warm white light-emitting diodes (w-LEDs) and temperature sensor applications. Lu1.9MoO6:0.1Eu3+ phosphor was synthesized by high-temperature solid-state reaction method, and the structure characterization was investigated for the first time. The excitation spectrum of this phosphor exhibits the intense broad band ranging from 250 nm to 440 nm assigned to the O2−-Mo6+ charge transfer band (CTB) transition, and a strong red emission centered at 610 nm corresponding to the 5D0 → 7F2 transition of Eu3+ ions were detected under 365 nm excitation. Importantly, warm white light composite material was hybridized via blending commercial green, blue and the present red phosphors, which under 365 nm excitation exhibited a high color rendering index (CRI) of 78 at a correlated color temperature of 4271 K with CIE coordinates of x = 0.351, y = 0.308. Furthermore, a strong temperature sensitization phenomenon was found, where the results show that the emission intensities and chromaticity coordinates are sensitive to the temperature, which can provide guidance for the potential application in temperature sensing.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.10.008
       
  • Sintering behavior and microstructure evolution in cp-titanium processed
           by spark plasma sintering
    • Authors: Andrzej Miklaszewski; Dariusz Garbiec; Katarzyna Niespodziana
      Pages: 50 - 57
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): Andrzej Miklaszewski, Dariusz Garbiec, Katarzyna Niespodziana
      This paper investigates the effect of various sintering temperatures from 800 to 1500 °C on the microstructure evolution of cp-titanium processed by Spark Plasma Sintering (SPS). The material processing conditions under consideration may change the obtained atomic order and microstructure. The different relation of the mechanical and corrosion resistance properties observed in the analyzed results could at the same time be shaped in the expected range. The SPS procedure allows the obtainment of nearly theoretical densities of the compacts and excellent mechanical properties (UTS = 892 MPa, CS = 1442 MPa). The results confirm that the contact angle measurement could support the process control, particularly if a microstructure feature is considered.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.10.010
       
  • One-step synthesis, characterization and oxidative desulfurization of
           12-tungstophosphoric heteropolyanions immobilized on amino functionalized
           SBA-15
    • Authors: Xuan Nui Pham; Dinh Linh Tran; Tuan Dat Pham; Quang Man Nguyen; Van Thi Tran Thi; Huan Doan Van
      Pages: 58 - 65
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): Xuan Nui Pham, Dinh Linh Tran, Tuan Dat Pham, Quang Man Nguyen, Van Thi Tran Thi, Huan Doan Van
      Keggin-type 12-tungstophosphoric [PW12O40]3− heteropolyanions were successfully immobilized onto mesoporous material surface of SBA-15 functionalized using the (3-aminopropyl)triethoxysilane (APTES) synthesized by one-pot co-condensation method, also called one-step synthesis. The synthesized PW−-NH3 +-SBA-15 catalyst was characterized by XRD, N2 adsorption–desorption, FT-IR, TGA, SEM, TEM, EDS, XPS methods. The results indicated that ordered hexagonal mesostructure for SBA-15 support was still maintained after being functionalized with amine groups, while the specific surface area of SBA-15 was decreased. The active species of phosphotungstic acid H3PW12O40 (HPW) retained its Keggin structure of the heteropolyanions on the amine-modified SBA-15. The PW−–+H3N–SBA–15 catalyst exhibited a high catalytic activity for oxidative desulfurization process of sulfur-containing model fuel. The dibenzothiophene (DBT) conversion of almost 100% was achieved with reaction conditions of 40 mg of catalyst dosage, 2 mL of hydrogen peroxide, 90 °C of reaction temperature, and 120 min of reaction time.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.10.011
       
  • Impact of nonuniform heated plate on double-diffusive natural convection
           of micropolar fluid in a square cavity with Soret and Dufour effects
    • Authors: M. Muthtamilselvan; K. Periyadurai; Deog Hee Doh
      Pages: 66 - 77
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): M. Muthtamilselvan, K. Periyadurai, Deog Hee Doh
      A numerical work has been carried out to study the effect of heated plate on double diffusive natural convection in a cavity with the presence of Soret and Dufour effects. The vertical left and right sidewalls of the cavity are maintained at constant cold temperatures while the lower and upper walls are considered insulated. The influence of pertinent parameters such as Rayleigh number, Schmidt number, vortex viscosity parameter, Soret and Dufour coefficients and plate non-uniformity parameter on the flow and heat transfer characteristics has been examined. Numerical results show that the heat and mass transfer rate increases with the rise of the Rayleigh number and Schmidt number. It is found that the heat and mass transfer rate are considerably suppressed by the vortex viscosity parameter. In addition, it is observed that the average Nusselt number increases and Sherwood number decreases with increasing Soret and Dufour effects.
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      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.10.012
       
  • Highly enhanced photocatalytic performance of Zn(1−x)MgxO/rGO nanostars
           under sunlight irradiation synthesized by one-pot refluxing method
    • Authors: Ramin Yousefi; H.R. Azimi; M.R. Mahmoudian; Mohsen Cheraghizade
      Pages: 78 - 85
      Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1
      Author(s): Ramin Yousefi, H.R. Azimi, M.R. Mahmoudian, Mohsen Cheraghizade
      The current research presents a simple, coast-effective, and one-pot refluxing method to synthesize Zn(1−x)MgxO nanostructures, which were decorated on graphene oxide (GO) sheets. In the first step, the effect of refluxing time on structure and morphology of the pristine ZnO nanostructures was investigated. X-ray diffraction (XRD) patterns indicated that the pristine ZnO nanostructures were formed after 8 h of the refluxing process. Field emission electron microscope (FESEM) images showed that stars-shape ZnO nanostructures were formed after 10 h of refluxing time. Further refluxing process for 12 h showed that morphology and structure of the ZnO nanostructures were not changed. However, after 14 h additional phases were formed. Therefore, ZnO and Zn(1−x)MgxO nanostars that were decorated on GO sheets were synthesized during 10 h. XRD patterns indicated that GO sheets were changed into reduced graphene oxides (rGO) during the refluxing process. Transmission electron microscope (TEM) images revealed that ZnO nanostars with more branches were decorated on rGO sheets. However, the TEM images showed that the morphology of ZnxMg(1−x)O/rGO nanocomposites were changed significantly with the increase of Mg concentration up to 6%. Photocatalytic performance of the products was examined under natural sunlight irradiation. The results showed that the rGO and Mg concentrations had significant roles in the photocatalytic performance of ZnO nanostars. The concentrations of Mg and rGO increased up to 4% were the optimum concentration for enhancing photocatalytic performance of Zn(1−x)MgxO/rGO nanocomposites. In addition, room temperature photoluminescence (PL) spectroscopy and photocurrent measurement results indicated that Mg and rGO with optimum concentration caused decrease of electron-hole recombination rate.
      Graphical abstract image

      PubDate: 2017-12-27T09:51:06Z
      DOI: 10.1016/j.apt.2017.10.014
       
  • Inside Front Cover (Aims & Scope, Editors)
    • Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2


      PubDate: 2017-12-27T09:51:06Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: February 2018
      Source:Advanced Powder Technology, Volume 29, Issue 2


      PubDate: 2017-12-27T09:51:06Z
       
  • Inside Front Cover (Aims & Scope, Editors)
    • Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1


      PubDate: 2017-12-27T09:51:06Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: January 2018
      Source:Advanced Powder Technology, Volume 29, Issue 1


      PubDate: 2017-12-27T09:51:06Z
       
  • Nigella arvensis leaf extract mediated green synthesis of silver
           nanoparticles: Their characteristic properties and biological efficacy
    • Authors: Azam Chahardoli; Naser Karimi; Ali Fattahi
      Abstract: Publication date: Available online 15 November 2017
      Source:Advanced Powder Technology
      Author(s): Azam Chahardoli, Naser Karimi, Ali Fattahi
      In the present study, the potential of aqueous leaf extract of Nigella arevensis for biosynthesis of silver nanoparticles (AgNPs) was evaluated. The formation of AgNPs was confirmed by color changes and UV–visible spectroscopy, which showed absorbance maxima peak at 416 nm. The transmission electron microscope (TEM) image showed the AgNPs to be anisotropic and mostly spherical with sizes in the range of 5–100 nm. Fourier transform infrared (FTIR) analysis indicated that the flavonoids, alkaloids and phenolic groups present in leaf extract were involved in the reduction and capping of phytogenic AgNPs. These nanoparticles showed the cytotoxic effects against H1229 and MCF-7 cancer cell lines with an IC50 value of 10 μg/mL. AgNPs showed insignificant antioxidant properties compared to the crude extract, and it was effective against clinical isolated bacterial strains. Furthermore, the bioderived AgNPs displayed significant catalytic activity against methylene blue. These results confirmed the advantages and applications of these phytogenic AgNPs using the green method in various fields.
      Graphical abstract image

      PubDate: 2017-11-17T13:01:12Z
      DOI: 10.1016/j.apt.2017.11.003
       
  • Dry grinding in planetary ball mills: Evaluation of a stressing model
    • Authors: Christine Burmeister; Larissa Titscher; Sandra Breitung-Faes; Arno Kwade
      Abstract: Publication date: Available online 11 November 2017
      Source:Advanced Powder Technology
      Author(s): Christine Burmeister, Larissa Titscher, Sandra Breitung-Faes, Arno Kwade
      Planetary ball mills at laboratory scale are widely used for grinding and alloying processes. However, in contrast to other mill types, no applicable mechanistic model exists to describe the stressing conditions and their effect on particle breakage, so that processes are empirically evaluated so far. Within this study, the stressing conditions are determined by simulations based on the discrete element method including the contact model of Hertz and Mindlin. The contact model parameters are carefully calibrated by a series of experiments, so that it is finally possible to validate the simulation results by comparison of measured and calculated power values. The correlation of stressing conditions and breakage rates of alumina powder demonstrates the effect of stressing on breakage kinetics and breakage mechanism. It allows calculating the active mass in dependence on process parameters by an extension of Schönert’s active mass model. Altogether, the presented stressing model features analytical functions for the mill-related stressing conditions and highlights the importance of stressing intensity as process determining parameter, which defines the required number of material-related stressing events and the specific energy.
      Graphical abstract image

      PubDate: 2017-11-17T13:01:12Z
      DOI: 10.1016/j.apt.2017.11.001
       
  • Modeling thermal conductivity enhancement of metal and metallic oxide
           nanofluids using support vector regression
    • Authors: Ibrahim O. Alade; Tajudeen A. Oyehan; Idris K. Popoola; Sunday O. Olatunji; Bagudu Aliyu
      Abstract: Publication date: Available online 10 November 2017
      Source:Advanced Powder Technology
      Author(s): Ibrahim O. Alade, Tajudeen A. Oyehan, Idris K. Popoola, Sunday O. Olatunji, Bagudu Aliyu
      Enhancing thermal conductivity of nanofluids is an important objective in heat transfer applications. Experimental measurement of thermal conductivity is time consuming, laborious and expensive. One of the common ways to address these limitations involves developing theoretical models to study thermo-physical properties of nanofluid. However, most classical and empirical models fail in predicting experimental results with good precision. In this study, we developed support vector regression (SVR) models that are capable of predicting the thermal conductivity enhancement for metallic and metallic-oxide nanofluids. The accuracy and reliability of the developed models were assessed using statistical parameters such as correlation coefficient (R2), root mean square error (RMSE) and mean absolute error (MAE). The models were characterized with very high correlation coefficients of 99.3 and 96.3% for the metallic and metallic oxide nanofluids, respectively. While the RMSE obtained were 1.11 and 1.33 for the metallic and metallic oxide nanofluids, respectively. In addition, the results of the models were compared with Hamilton-Crosser (HC) model and other empirical models. The SVR models performed much better than all the models examined. Furthermore, the effects of temperature, volume fractions, nanoparticle size & type and basefluids types were correlated with experimental data in order to assess the performance of the developed models. The results indicate that SVR predictions were accurate and better than common theoretical models.
      Graphical abstract image

      PubDate: 2017-11-10T08:37:52Z
      DOI: 10.1016/j.apt.2017.10.023
       
  • Experimental study on moldability and segregation of Inconel 718
           feedstocks used in low-pressure powder injection molding
    • Authors: V. Demers; F. Fareh; S. Turenne; N. Demarquette; O. Scalzo
      Abstract: Publication date: Available online 8 November 2017
      Source:Advanced Powder Technology
      Author(s): V. Demers, F. Fareh, S. Turenne, N. Demarquette, O. Scalzo
      Moldability and segregation of feedstock are linked to the rheological behavior of the powder-binder mixture. In this study, the impact of binders on viscosity and segregation of feedstocks was investigated. The experiments were conducted on several feedstocks obtained by mixing Inconel 718 powder with paraffin wax-based binder systems. The viscosity of feedstocks was measured by a rotational rheometer while the segregation within green parts was evaluated using a thermogravimetric analyzer. It was demonstrated that the variation in solid loading within a molded part can be measured with a sensitivity of at least ±0.25 vol% of powder. The results indicated that the predominant powder-binder separation appears clearly at the top and the bottom of the molded part. It was also shown that the viscosity profiles of feedstocks and the intensity of segregation depends significantly on the binder constituents used in feedstock formulation. The mixture containing only paraffin wax produced the best trade-off between high moldability and low segregation for an injection process requiring an extended time range between injection and solidification of the part (e.g. up to 10 min). For a short processing time (e.g. <1 min spent in molten state), the feedstocks containing paraffin wax with stearic acid or small amount of ethylene vinyl acetate can be also considered as good candidates for LPIM process because their viscosity and segregation potential are relatively low.
      Graphical abstract image

      PubDate: 2017-11-10T08:37:52Z
      DOI: 10.1016/j.apt.2017.10.025
       
  • Formation phenomena of iron oxide-silica composite in microwave plasma and
           DC thermal plasma
    • Authors: Dong-Wook Kim; Satoshi Kodama; Hidetoshi Sekiguchi; Dong-Wha Park
      Abstract: Publication date: Available online 8 November 2017
      Source:Advanced Powder Technology
      Author(s): Dong-Wook Kim, Satoshi Kodama, Hidetoshi Sekiguchi, Dong-Wha Park
      Iron oxide-silica composite was synthesized using atmospheric microwave plasma and DC thermal plasma. There has recently been increasing interest in predicting the final product during vapor phase synthesis using plasma because of difficulty obtaining desirable product. In this study, vapor phase synthesis of iron oxide-silica composite from iron pentacarbonyl (Fe(CO)5) and tetraethyl orthosilicate (SiC8H20O4, TEOS) was conducted using various Fe/Si ratios and different types of plasma to identify the formation mechanism in the Fe-Si-O multi-component system. The morphologies and phase compositions of the synthesized particles were analyzed and compared. The results showed that the Fe/Si ratio and the type of plasma influenced the morphologies and the phase composition. A thermodynamic consideration was introduced to investigate the particle formation phenomena, which could explain the differences induced by varying the Fe/Si ratio and type of plasma. The particle formation mechanism was divided into a condensation step and a diffusion step. At the condensation step, the Fe/Si ratio determined the condensation temperature, which is related to the morphology. At the diffusion step, the quenching rate of the plasma determined the degree of diffusion, which was related to the phase composition and formation of the external layer.
      Graphical abstract image

      PubDate: 2017-11-10T08:37:52Z
      DOI: 10.1016/j.apt.2017.10.024
       
  • Influence of Ni(II), Cu(II) and Cr(III) on the formation, morphology and
           molecular adsorption properties of α-FeOOH rust particles prepared by
           aerial oxidation of neutral Fe(II) solutions
    • Authors: Hidekazu Tanaka; Akira Miyafuji; Tatsuo Ishikawa; Takenori Nakayama
      Abstract: Publication date: Available online 6 November 2017
      Source:Advanced Powder Technology
      Author(s): Hidekazu Tanaka, Akira Miyafuji, Tatsuo Ishikawa, Takenori Nakayama
      To elucidate the role of alloying metals such as Ni, Cu and Cr in weathering steels on the formation of α-FeOOH rust by atmospheric corrosion of the steels in industrial and urban districts, influence of alloying metal ions on the formation, morphology and adsorption properties of α-FeOOH particles synthesized by aerial oxidation of neutral FeSO4 solution was examined. The addition of Cu(II) and Cr(III) dramatically suppresses the crystal growth of α-FeOOH and turns the rod-shaped α-FeOOH particles into nano-sized irregular ones. Besides, increase of amount of added Cr(III) forms the iron oxyhydroxysulfate named as Schwertmannite (Fe8O8(SO4)(OH)6). Whereas, the Ni(II) addition shows no noticeable influence on the growth of α-FeOOH crystal and particles. These results imply that the inhibitory effect of crystal and particle growth of α-FeOOH is in order of Cr(III) > Cu(II) >> Ni(II). The adsorption of CO2 gas on the α-FeOOH particles is impeded by adding Cu(II) and Cr(III). Whereas, the formation of Schwertmannite by adding Cr(III) enhances the CO2 and SO2 adsorption. These results suggest that alloying Cu and Cr in weathering steels inhibit the crystal and particle growth of α-FeOOH to accelerate the formation of protective rust layer composed of fine α-FeOOH and/or Schwertmannite rust particles on the steels in urban and industrial atmosphere.
      Graphical abstract image

      PubDate: 2017-11-10T08:37:52Z
      DOI: 10.1016/j.apt.2017.09.015
       
  • Nanofluid and porous fins effect on natural convection and entropy
           generation of flow inside a cavity
    • Authors: Majid Siavashi; Reza Yousofvand; Saeed Rezanejad
      Abstract: Publication date: Available online 3 November 2017
      Source:Advanced Powder Technology
      Author(s): Majid Siavashi, Reza Yousofvand, Saeed Rezanejad
      In the present study, natural convection of Cu-water nanofluid in a cavity with an array of porous fins on its hot wall has been numerically analyzed using two-phase approach. Use of porous fins, instead of solid ones, improves conduction while could have negligible effect on convection as flow can pass through them. Therefore, the effects of the number of fins and their length on heat transfer enhancement and entropy generation are scrutinized. The study has been conducted for the certain pertinent parameters of Rayleigh number (Ra = 10 4 to 10 6 ), Darcy number (Da = 10 - 1 to 10 - 4 ), and the nanoparticle volume fraction ( φ = 0 to 0.04 ) and results are investigated in terms of heat transfer, entropy generation and performance coefficient (PEC). Numerical results indicate that adding porous fins with a high Darcy number improves heat transfer while fins with a low Darcy number can weaken the convection and decline Nusselt number. In strong flow fields an increase in either the length or the number of fins has insignificant effect on Nu. Also, low concentration of nanoparticles enhances the heat transfer more than high values of nanoparticles. On the other hand, entropy generation decreases by increasing the number of fins and PEC enhances by using porous fins in most of the studied cases. PEC of pure fluid is higher than the nanofluid at low Ra numbers, while opposite fact is observed for high Ra values.
      Graphical abstract image

      PubDate: 2017-11-10T08:37:52Z
      DOI: 10.1016/j.apt.2017.10.021
       
  • Experimental and numerical study of granular medium-rough wall interface
           friction
    • Authors: K. El Cheikh; C. Djelal; Y. Vanhove; P. Pizette; S. Remond
      Abstract: Publication date: Available online 31 October 2017
      Source:Advanced Powder Technology
      Author(s): K. El Cheikh, C. Djelal, Y. Vanhove, P. Pizette, S. Remond
      Wall roughness plays a crucial role in granular medium - rough wall interface friction. In this study, an experimental device has been designed to study the influence of boundary conditions, more specifically wall roughness, on the behavior of sheared granular medium. The study is based on use of an analog model, and consists of simulating roughness by means of notches and grains in the medium by monodisperse beads and on use of a numerical model based on the discrete element method. The test protocol entails displacing at fixed speed notched rods under confined granular medium. Movement of the beads layer near the rods as well as friction of the beads against the rods are both studied herein. Results indicate that the parameter controlling friction at the granular medium - rough wall interface is primarily the depth of beads embedment in surface asperities. The objective of the associated numerical modeling is to supplement the experimental results.
      Graphical abstract image

      PubDate: 2017-11-03T08:08:34Z
      DOI: 10.1016/j.apt.2017.10.020
       
  • Triboelectric separation of a starch-protein mixture – Impact of
           electric field strength and flow rate
    • Authors: Johann Landauer; Petra Foerst
      Abstract: Publication date: Available online 31 October 2017
      Source:Advanced Powder Technology
      Author(s): Johann Landauer, Petra Foerst
      Triboelectric separation is a method for separating dry particulate systems due to their different electrostatic chargeability. Previous applications are limited to the separation of coarse powders. The aim of the present study is to examine the influence of the flow conditions and the influence of the electric field strength on the separation efficiency of starch and protein particles. Very fine organic powders are separated in a simple bench scale electrostatic separator to extend this technique to powders below 50 µm. The influence of different gas flow rates in the turbulent flow regime on particle charging and subsequent separation is investigated. As an organic model substrate, a mixture of barley starch and whey protein was used. The tribocharger consists of a PTFE charging tube and a rectangular separation chamber where an electric field is applied between two electrodes. The particles are conveyed through the charging tube and charged by frictional contact with the tube wall. It is shown that different gas flow rates at a turbulent flow regime in the charging tube did not change the separation characteristics. In contrast, increasing electrical field strength increases separation efficiency of protein particles regardless of gas flow conditions. The proportion of starch at the anode is the same for all the investigated parameters.
      Graphical abstract image

      PubDate: 2017-11-03T08:08:34Z
      DOI: 10.1016/j.apt.2017.10.018
       
  • Magnetically recoverable highly efficient visible-light-active
           g-C3N4/Fe3O4/Ag2WO4/AgBr nanocomposites for photocatalytic degradations of
           environmental pollutants
    • Authors: Mitra Mousavi; Aziz Habibi-Yangjeh
      Abstract: Publication date: Available online 31 October 2017
      Source:Advanced Powder Technology
      Author(s): Mitra Mousavi, Aziz Habibi-Yangjeh
      Herein, magnetically recoverable g-C3N4/Fe3O4/Ag2WO4/AgBr (gCN/M/AgW/AgBr) nanocomposites, as greatly efficient visible-light-active photocatalysts, were fabricated by successive decoration of Fe3O4, Ag2WO4, and AgBr over g-C3N4 (gCN) and they were characterized by XRD, EDX, SEM, TEM, HRTEM, UV–vis DRS, FT-IR, PL, TG, and VSM analysis. Visible-light-induced photocatalytic performances were studied by degradations of RhB, MB, MO, and fuchsine pollutants. It was confirmed that the nanocomposites are effective in the reduction of e−/h+ recombination through the matched interactions between energy bands of gCN, Fe3O4, Ag2WO4, and AgBr semiconductors. The highest photocatalytic degradation efficiency was observed for the gCN/M/AgW/AgBr (30%) nanocomposite when it was refluxed for 30 min. Activity of this nanocomposite is almost 21, 41, 94, and 10-folds greater than those of the gCN toward the degradations of RhB, MB, MO, and fuchsine pollutants, respectively. Additionally, a mechanism for the superior photocatalytic performances was proposed using reactive species scavenging experiments and characterization results.
      Graphical abstract image

      PubDate: 2017-11-03T08:08:34Z
      DOI: 10.1016/j.apt.2017.10.016
       
  • Synthesis of -cordierite nanoparticles from bentonite using
           thermal shock assisted solid-state reaction method
    • Authors: Cheraghi Shoushtarizadeh; Malekfar Alizadeh
      Abstract: Publication date: Available online 31 October 2017
      Source:Advanced Powder Technology
      Author(s): A. Cheraghi, H. Shoushtarizadeh, R. Malekfar, O. Alizadeh
      For the first time, we believe, nanosized <alpha>-cordierite glass-ceramics are produced using bentonite, talc, alumina, and kaolin as the raw materials and applying thermal shock to the precursor powders and sintered at 1100, 1200, and 1300 °C. A combination of a furnace at about 800 °C and liquid nitrogen was used for the applied thermal shock with a total temperature difference of about 1000 °C. The effects of thermal shock process and sintering temperature on <alpha>-cordierite formation and microstructure have been investigated. The results show that <alpha>-cordierite was formed above 1160 °C and its weight ratio increased continuously as sintered temperature increased to 1300 °C. By increasing the temperature, <alpha>-cordierite nanoparticles grain sizes and the intensity of FTIR peaks started to increase. Applying thermal shock to precursor powders reduced the grain size of each consisting mineral and resulted in nanosized <alpha>-cordierite powder.
      Graphical abstract image

      PubDate: 2017-11-03T08:08:34Z
       
  • Synthesis of silver nanoparticles in an eco-friendly way using Phyllanthus
           amarus leaf extract: Antimicrobial and catalytic activity
    • Authors: B. Ajitha; Y. Ashok Kumar Reddy; Hwan-Jin Jeon; Chi Won Ahn
      Abstract: Publication date: Available online 31 October 2017
      Source:Advanced Powder Technology
      Author(s): B. Ajitha, Y. Ashok Kumar Reddy, Hwan-Jin Jeon, Chi Won Ahn
      In the present study, silver nanoparticles (AgNPs) with a flower-like structure were synthesized through an easy, rapid and eco-friendly pathway using Phyllanthus amarus leaf extract. The obtained AgNPs were characterized using ultraviolet–visible (UV–Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). In addition, the antimicrobial and catalytic activities of the bio-synthesized AgNPs were carried out. Our results indicated that the concentration of the Ag precursor and the volume of the leaf extract played key roles in the formation of the flower-shaped AgNPs. Morphology study confirms the shape of the obtained bio-AgNPs as flower like structure. This study also showed the presence of clear capping layers surrounding and apparently interacting with the nanoparticles. Moreover, our studies indicated this interaction to involve bio-organic capping agents in the leaf extract. UV–Vis absorption spectra confirmed the formation of AgNPs with an optimized size. The zeta (ζ) potential of the AgNPs attests the stability of the nanoparticles. FTIR spectra provided evidence for the presence of biomolecules responsible for the reduction as well as capping of the AgNPs. Finally, the bio-synthesized AgNPs were shown to be an excellent microbial activity against the selected pathogens and enhanced catalyst of the reduction of rhodamine B.
      Graphical abstract image

      PubDate: 2017-11-03T08:08:34Z
      DOI: 10.1016/j.apt.2017.10.015
       
  • Facile preparation of Ce-doped TiO2/diatomite granular composite with
           enhanced photocatalytic activity
    • Authors: Yan Chen; Qiong Wu; Chao Zhou; Qiutong Jin
      Abstract: Publication date: Available online 31 October 2017
      Source:Advanced Powder Technology
      Author(s): Yan Chen, Qiong Wu, Chao Zhou, Qiutong Jin
      Granule-shaped Ce-doped TiO2/diatomite (GCTD) hybrid was prepared via sol-gel method. The physicochemical properties of this hybrid were characterized by various analytical methods. As carrier, diatomite was conducive to the dispersion of TiO2 nanoparticles, hindering their agglomeration process. Compared to TiO2, GCTD showed visible-light-driven photoactivity, which was evaluated by the degradation of oxytetracycline (OTC) and disinfection of three bacteria (Escherichia coli, Staphylococcus aureus and Klebsiella pneumonia) under visible light. The porous diatomite enhanced the photoactivity of TiO2 via the adsorption towards target pollutants. The reusability experiment was conducted for 5 times, and the results showed that GCTD exhibited good photo-stability and reusability.
      Graphical abstract image

      PubDate: 2017-11-03T08:08:34Z
      DOI: 10.1016/j.apt.2017.10.017
       
 
 
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