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Publisher: Elsevier   (Total: 3163 journals)

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Showing 1 - 200 of 3163 Journals sorted alphabetically
A Practical Logic of Cognitive Systems     Full-text available via subscription   (Followers: 9)
AASRI Procedia     Open Access   (Followers: 14)
Academic Pediatrics     Hybrid Journal   (Followers: 30, SJR: 1.655, CiteScore: 2)
Academic Radiology     Hybrid Journal   (Followers: 22, SJR: 1.015, CiteScore: 2)
Accident Analysis & Prevention     Partially Free   (Followers: 88, SJR: 1.462, CiteScore: 3)
Accounting Forum     Hybrid Journal   (Followers: 25, SJR: 0.932, CiteScore: 2)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 35, SJR: 1.771, CiteScore: 3)
Achievements in the Life Sciences     Open Access   (Followers: 5)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 7)
Acta Astronautica     Hybrid Journal   (Followers: 398, SJR: 0.758, CiteScore: 2)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Biomaterialia     Hybrid Journal   (Followers: 27, SJR: 1.967, CiteScore: 7)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 2)
Acta de Investigación Psicológica     Open Access   (Followers: 3)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.18, CiteScore: 1)
Acta Haematologica Polonica     Free   (Followers: 1, SJR: 0.128, CiteScore: 0)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.661, CiteScore: 2)
Acta Materialia     Hybrid Journal   (Followers: 242, SJR: 3.263, CiteScore: 6)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.504, CiteScore: 1)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.542, CiteScore: 1)
Acta Oecologica     Hybrid Journal   (Followers: 10, SJR: 0.834, CiteScore: 2)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription  
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 2, SJR: 0.307, CiteScore: 0)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 1, SJR: 1.793, CiteScore: 6)
Acta Poética     Open Access   (Followers: 4, SJR: 0.101, CiteScore: 0)
Acta Psychologica     Hybrid Journal   (Followers: 27, SJR: 1.331, CiteScore: 2)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.052, CiteScore: 2)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 3, SJR: 0.374, CiteScore: 1)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 2)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.344, CiteScore: 1)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 1)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 6, SJR: 0.19, CiteScore: 0)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 3)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 6)
Acute Pain     Full-text available via subscription   (Followers: 15, SJR: 2.671, CiteScore: 5)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.53, CiteScore: 4)
Addictive Behaviors     Hybrid Journal   (Followers: 16, SJR: 1.29, CiteScore: 3)
Addictive Behaviors Reports     Open Access   (Followers: 8, SJR: 0.755, CiteScore: 2)
Additive Manufacturing     Hybrid Journal   (Followers: 9, SJR: 2.611, CiteScore: 8)
Additives for Polymers     Full-text available via subscription   (Followers: 22)
Advanced Cement Based Materials     Full-text available via subscription   (Followers: 3, SJR: 0.732, CiteScore: 3)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 136, SJR: 4.09, CiteScore: 13)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.167, CiteScore: 4)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.694, CiteScore: 3)
Advances in Accounting     Hybrid Journal   (Followers: 8, SJR: 0.277, CiteScore: 1)
Advances in Agronomy     Full-text available via subscription   (Followers: 12, SJR: 2.384, CiteScore: 5)
Advances in Anesthesia     Full-text available via subscription   (Followers: 28, SJR: 0.126, CiteScore: 0)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 10, SJR: 0.992, CiteScore: 1)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 1.551, CiteScore: 4)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 2.089, CiteScore: 5)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 14, SJR: 0.572, CiteScore: 2)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.61, CiteScore: 7)
Advances in Botanical Research     Full-text available via subscription   (Followers: 2, SJR: 0.686, CiteScore: 2)
Advances in Cancer Research     Full-text available via subscription   (Followers: 29, SJR: 3.043, CiteScore: 6)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 7, SJR: 1.453, CiteScore: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 1.992, CiteScore: 5)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 3)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 27, SJR: 0.156, CiteScore: 1)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.713, CiteScore: 1)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 10, SJR: 1.316, CiteScore: 2)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 1.562, CiteScore: 3)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19, SJR: 1.977, CiteScore: 8)
Advances in Computers     Full-text available via subscription   (Followers: 14, SJR: 0.205, CiteScore: 1)
Advances in Dermatology     Full-text available via subscription   (Followers: 15)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 8)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 23)
Advances in Ecological Research     Full-text available via subscription   (Followers: 42, SJR: 2.524, CiteScore: 4)
Advances in Engineering Software     Hybrid Journal   (Followers: 27, SJR: 1.159, CiteScore: 4)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 43, SJR: 5.39, CiteScore: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 1)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 53, SJR: 0.591, CiteScore: 2)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 1.354, CiteScore: 4)
Advances in Genome Biology     Full-text available via subscription   (Followers: 8, SJR: 12.74, CiteScore: 13)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 1.193, CiteScore: 3)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21, SJR: 0.368, CiteScore: 1)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11, SJR: 0.749, CiteScore: 3)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.193, CiteScore: 0)
Advances in Immunology     Full-text available via subscription   (Followers: 37, SJR: 4.433, CiteScore: 6)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 1.163, CiteScore: 2)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 2, SJR: 1.938, CiteScore: 3)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6, SJR: 0.176, CiteScore: 0)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 3)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.682, CiteScore: 2)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 14, SJR: 0.88, CiteScore: 2)
Advances in Mathematics     Full-text available via subscription   (Followers: 11, SJR: 3.027, CiteScore: 2)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.694, CiteScore: 2)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.158, CiteScore: 3)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 21)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 8)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.182, CiteScore: 0)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 3)
Advances in Oncobiology     Full-text available via subscription   (Followers: 1)
Advances in Organ Biology     Full-text available via subscription   (Followers: 1)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 16, SJR: 1.875, CiteScore: 4)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 6, SJR: 0.174, CiteScore: 0)
Advances in Parasitology     Full-text available via subscription   (Followers: 5, SJR: 1.579, CiteScore: 4)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.461, CiteScore: 1)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 10)
Advances in Pharmacology     Full-text available via subscription   (Followers: 16, SJR: 1.536, CiteScore: 3)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.574, CiteScore: 1)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.109, CiteScore: 1)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
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: 19, SJR: 0.791, CiteScore: 2)
Advances in Psychology     Full-text available via subscription   (Followers: 59)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6, SJR: 0.371, CiteScore: 1)
Advances in Radiation Oncology     Open Access   (SJR: 0.263, CiteScore: 1)
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.101, CiteScore: 0)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 5)
Advances in Space Research     Full-text available via subscription   (Followers: 385, SJR: 0.569, CiteScore: 2)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Surgery     Full-text available via subscription   (Followers: 10, SJR: 0.555, CiteScore: 2)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 30, SJR: 2.208, CiteScore: 4)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 17)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 2.262, CiteScore: 5)
Advances in Water Resources     Hybrid Journal   (Followers: 46, SJR: 1.551, CiteScore: 3)
Aeolian Research     Hybrid Journal   (Followers: 6, SJR: 1.117, CiteScore: 3)
Aerospace Science and Technology     Hybrid Journal   (Followers: 338, SJR: 0.796, CiteScore: 3)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.42, CiteScore: 2)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.296, CiteScore: 0)
Ageing Research Reviews     Hybrid Journal   (Followers: 10, SJR: 3.671, CiteScore: 9)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 437, SJR: 1.238, CiteScore: 3)
Agri Gene     Hybrid Journal   (SJR: 0.13, CiteScore: 0)
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 1.818, CiteScore: 5)
Agricultural Systems     Hybrid Journal   (Followers: 31, SJR: 1.156, CiteScore: 4)
Agricultural Water Management     Hybrid Journal   (Followers: 43, SJR: 1.272, CiteScore: 3)
Agriculture and Agricultural Science Procedia     Open Access   (Followers: 1)
Agriculture and Natural Resources     Open Access   (Followers: 2)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 56, SJR: 1.747, CiteScore: 4)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.589, CiteScore: 3)
Air Medical J.     Hybrid Journal   (Followers: 6, SJR: 0.26, CiteScore: 0)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.19, CiteScore: 0)
Alcohol     Hybrid Journal   (Followers: 11, SJR: 1.153, CiteScore: 3)
Alcoholism and Drug Addiction     Open Access   (Followers: 9)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.604, CiteScore: 3)
Alexandria J. of Medicine     Open Access   (Followers: 1, SJR: 0.191, CiteScore: 1)
Algal Research     Partially Free   (Followers: 10, SJR: 1.142, CiteScore: 4)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.504, CiteScore: 1)
Allergology Intl.     Open Access   (Followers: 5, SJR: 1.148, CiteScore: 2)
Alpha Omegan     Full-text available via subscription   (SJR: 3.521, CiteScore: 6)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 9, SJR: 0.201, CiteScore: 1)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 50, SJR: 4.66, CiteScore: 10)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 4, SJR: 1.796, CiteScore: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 4, SJR: 1.108, CiteScore: 3)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 6)
American Heart J.     Hybrid Journal   (Followers: 50, SJR: 3.267, CiteScore: 4)
American J. of Cardiology     Hybrid Journal   (Followers: 51, SJR: 1.93, CiteScore: 3)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 44, SJR: 0.604, CiteScore: 1)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 10)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.524, CiteScore: 3)
American J. of Human Genetics     Hybrid Journal   (Followers: 32, SJR: 7.45, CiteScore: 8)
American J. of Infection Control     Hybrid Journal   (Followers: 26, SJR: 1.062, CiteScore: 2)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 34, SJR: 2.973, CiteScore: 4)
American J. of Medicine     Hybrid Journal   (Followers: 43)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3, SJR: 1.967, CiteScore: 2)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 200, SJR: 2.7, CiteScore: 4)
American J. of Ophthalmology     Hybrid Journal   (Followers: 61, SJR: 3.184, CiteScore: 4)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 5, SJR: 0.265, CiteScore: 0)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.289, CiteScore: 1)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, CiteScore: 1)
American J. of Pathology     Hybrid Journal   (Followers: 27, SJR: 2.139, CiteScore: 4)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 27, SJR: 2.164, CiteScore: 4)
American J. of Surgery     Hybrid Journal   (Followers: 37, SJR: 1.141, CiteScore: 2)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.767, CiteScore: 1)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 6)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.144, CiteScore: 3)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 63, SJR: 0.138, CiteScore: 0)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 15, SJR: 0.411, CiteScore: 1)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 3, SJR: 0.277, CiteScore: 0)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription  
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 5, SJR: 4.849, CiteScore: 10)
Analytica Chimica Acta     Hybrid Journal   (Followers: 39, SJR: 1.512, CiteScore: 5)
Analytical Biochemistry     Hybrid Journal   (Followers: 176, SJR: 0.633, CiteScore: 2)
Analytical Chemistry Research     Open Access   (Followers: 10, SJR: 0.411, CiteScore: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 2)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 23, SJR: 0.683, CiteScore: 2)
Angiología     Full-text available via subscription   (SJR: 0.121, CiteScore: 0)
Angiologia e Cirurgia Vascular     Open Access   (Followers: 1, SJR: 0.111, CiteScore: 0)

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Journal Cover
Advanced Powder Technology
Journal Prestige (SJR): 0.694
Citation Impact (citeScore): 3
Number of Followers: 16  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0921-8831 - ISSN (Online) 1568-5527
Published by Elsevier Homepage  [3163 journals]
  • A review of current techniques for the evaluation of powder mixing
    • Authors: Maryam Asachi; Ehsan Nourafkan; Ali Hassanpour
      Pages: 1525 - 1549
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Maryam Asachi, Ehsan Nourafkan, Ali Hassanpour
      Blending a mixture of powders to a homogeneous system is a crucial step in many manufacturing processes. To achieve a high quality of the end product, powder mixtures should be made with high content uniformity. For instance, producing uniform tablets depends on the homogeneous dispersion of active pharmaceutical ingredient (API), often in low level quantities, into excipients. To control the uniformity of a powder mixture, the first required step is to estimate the powder content information during blending. There are several powder homogeneity evaluation techniques which differ in accuracy, fundamental basis, cost and operating conditions. In this article, emerging techniques for the analysis of powder content and powder blend uniformity, are explained and compared. The advantages and drawbacks of all the techniques are reviewed to help the readers to select the appropriate equipment for the powder mixing evaluation. In addition, the paper highlights the recent innovative on-line measurement techniques used for the non-invasive evaluation of the mixing performance.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.031
       
  • Determination of Hansen parameters for particles: A standardized routine
           based on analytical centrifugation
    • Authors: Sebastian Süß; Titus Sobisch; Wolfgang Peukert; Dietmar Lerche; Doris Segets
      Pages: 1550 - 1561
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Sebastian Süß, Titus Sobisch, Wolfgang Peukert, Dietmar Lerche, Doris Segets
      The Hansen Solubility Parameters (HSP) are powerful descriptors to evaluate interactions of (polymer) molecules and their solubility in different liquids. Although approaches do exist to transfer the HSP-concept to the question of dispersibility of particles, HSP determination of slowly sedimenting (nano)particles (NPs) is time consuming and depends on the subjective evaluation of the experimenter. Herein, we introduce a new method for HSP determination for colloidal systems using analytical centrifugation (AC) which was applied to standardize and accelerate the experimental procedure. However, as not dissolution but dispersion is in focus, we propose to use the term Hansen Dispersibility Parameters (HDP) instead of HSP whenever dispersibility and stability of particles against agglomeration/flocculation are to be discussed. First, we implemented a standard dispersion routine for the well-known, industrially highly relevant pigment carbon black (CB). Then, a standardized method for the evaluation of measured AC profiles and appropriate ranking of NPs dispersibility in different media was developed. We demonstrate outstanding reproducibility of our results by comparing HDP derived for the same CB material from independent experiments performed at two different affiliations. Finally, we show the predictive power of HDP and the accuracy of our approach by evaluating the dispersibility of CB in additional liquids and mixtures of so-called “good” and “poor” liquid media crossing the border from stable to unstable medium conditions. Our study evidences the enormous potential of AC to determine the HDP of colloidal systems using a standardized and non-subjective method to access particle interactions and colloidal stability.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.018
       
  • Synthesis of hollow structural hydroxyapatite with different morphologies
           using calcium carbonate as hard template
    • Authors: Xu Xia; Jiwei Chen; Juan Shen; Di Huang; Peizhen Duan; Guohong Zou
      Pages: 1562 - 1570
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Xu Xia, Jiwei Chen, Juan Shen, Di Huang, Peizhen Duan, Guohong Zou
      Hydroxyapatite (HAp) with hollow structure was successfully synthesized by hydrothermal process of as-prepared calcium carbonate used as a hard template and calcium sources in a diammonium phosphate solution. Calcium carbonate was fabricated by precipitation, which possessed different morphologies such as balls, rods and blocks through regulating the amount of citric acid. The synthesized powders were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrograph (FT-IR), field-emission scanning electron microscope (FESEM) and high-resolution transmission electron microscopy (HRTEM) and nitrogen adsorption–desorption. Results indicated that different morphologies calcium carbonate could convert to hollow structural HAp with the higher BET surface area and the mesopores. Hydrothermal temperature and hydrothermal time play a slight role on transition percentage. As hydrothermal temperature and hydrothermal time increased, the conversion rate of calcium carbonate to hydroxyapatite increased. The possible formation mechanism of hydroxyapatite was preliminarily investigated. The resultants of HAp are interesting materials for drug delivery and sustained-release.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.021
       
  • A two-fluid model for calcium carbonate precipitation in highly
           supersaturated solutions
    • Authors: M.C. Reis; M.F.B. Sousa; F. Alobaid; C.A. Bertran; Y. Wang
      Pages: 1571 - 1581
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): M.C. Reis, M.F.B. Sousa, F. Alobaid, C.A. Bertran, Y. Wang
      Precipitation of calcium carbonate is a common phenomenon in nature, which has attracted attention from researchers due to its importance in biomineralization processes, climatic changes, and especially incrustations in pipelines. In this work, a two-fluid model is proposed for homogeneous crystallization of calcium carbonate in highly supersaturated solutions. By making an analogy between the dynamics of a granular gas and the dynamics of a solid dispersion, the proposed model not only accounts for the interaction forces between the solid particles and dispersion medium, but also for the mass transfer and changes in the particles size during the precipitation reaction. Moreover, by using a numerical scheme based on an iterative algorithm, 3D numerical simulations are performed for the homogeneous crystallization of calcium carbonate, and the results are compared with experimental particles size distributions and curves of pH versus time. The good agreement between theoretical and experimental results indicates that the two-fluid model can be successfully used to evaluate the growth kinetics of calcium carbonate nuclei.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.022
       
  • TiO2/void/porous Al2O3 shell embedded in polyvinylidene fluoride film for
           cleaning wastewater
    • Authors: Yuqing Zhang; Yanhua Hu; Yunge Zhang; Shaomin Liu
      Pages: 1582 - 1590
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Yuqing Zhang, Yanhua Hu, Yunge Zhang, Shaomin Liu
      In order to selectively adsorb hydrolyzed polyacryamide (HPAM) and remove oil from oily wastewater, TiO2/void/porous Al2O3 shell particles (TVAs) were designed and prepared though hydrolysis and calcination; subsequently, the TVAs were embedded into polyvinylidene fluoride (PVDF) to prepare composite films (TVAP films). As polymeric supports, TVAP films were employed to immobilize TiO2 powder. TVAs were characterized using SEM, TEM, FT-IR, BET while TVAP films were characterized by SEM. The results indicate that the particle size of TVAs is mainly distributed between 700 and 800 nm, core-shell structure has been successfully built. The removal rates of TVAP films prepared under the optimum synthesis conditions for oil and HPAM reach 69.70% and 60.20% respectively, performing attractive properties of mass transfer and adsorption. Therefore, TVAP films are desirable as suitable materials to clean oily wastewater.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.023
       
  • Understanding the morphological effects of WO3 photocatalysts for the
           degradation of organic pollutants
    • Authors: Sangeeta Adhikari; K. Sarath Chandra; Do-Heyoung Kim; Giridhar Madras; Debasish Sarkar
      Pages: 1591 - 1600
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Sangeeta Adhikari, K. Sarath Chandra, Do-Heyoung Kim, Giridhar Madras, Debasish Sarkar
      Dimension and morphology of photocatalysts has extensive interest in order to use the effective concurrence of photon. Despite TiO2 and ZnO, WO3 has also been considered as a promising candidate in terms of remediation and purification that owes to its visible light absorption and non-toxic environmental friendliness. In this study, we report the preparation of nanostructured WO3 with different morphologies for the photocatalytic degradation of organic pollutants without the presence of any sacrificial agents. The study envisages the effect of the aspect ratio of WO3 particles on the photochemical process and their inherent reactive species mechanism. Mechanistic reasoning revealed that, apart from the hole and hydroxyl radicals as the participating species in both structures, a significant contribution from superoxide radicals takes place in the presence of nanorods and promotes the photochemical reaction. High aspect ratio facilitates the absorption coefficient and resultant efficiency. Both the catalysts retain its reactivity after regeneration and confirms the consistent catalytic reusability. Reactivity enhancement of any photocatalyst is possible through tuning the inherent structure of the material.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.024
       
  • ROS mediated destruction of cell membrane, growth and biofilms of human
           bacterial pathogens by stable metallic AgNPs functionalized from bell
           pepper extract and quercetin
    • Authors: Bilal Ahmed; Anam Hashmi; Mohammad Saghir Khan; Javed Musarrat
      Pages: 1601 - 1616
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Bilal Ahmed, Anam Hashmi, Mohammad Saghir Khan, Javed Musarrat
      Yellow pepper extract and quercetin (QDH) were used for YPE-AgNPs and Q-AgNPs fabrication. The AgNPs were thoroughly characterized using standard physico-chemical techniques and were found monodispersed, pleomorphic and had variable shape and size with a lattice fringe of 0.23 nm. YPE-AgNPs and Q-AgNPs revealed a characteristic SPR band at 438 nm and 431 nm. The XRD crystal size of YPE-AgNPs and Q-AgNPs was 10.16 and 12.20 nm while TEM analysis showed a size range of 5–40 and 1–25 nm. Bio-fabricated AgNPs remained stable for at least four weeks as the SPR did not deviate with time. FTIR data revealed functionalization of AgNPs by organics of reaction mixture. AgNPs had robust antibacterial and antibiofilm activity against ESβL(+) Escherichia coli, Pseudomonas aeruginosa, and methicillin sensitive and resistant Staphylococcus aureus. Staining of isolates with fluorescent probes displayed the increased production of ROS and membrane permeability. AgNPs hampered EPS production, endorsed DNA leakage, and generated superoxide radicals. Time and concentration dependent experiments demonstrated a consistent decrease in bacterial growth. Structural changes viz. irregular margins, distortion, depressions/indentations and shrinkage of cells were obvious under SEM. AgNPs due to strong antibacterial activity could be exploited as a supplement with antibacterial drugs to control resilient human infections.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.025
       
  • CFD simulation of electrostatic effect on gas interchange, vortex and heat
           transfer in the gas-solid fluidized bed
    • Authors: Haotong Wang; Musango Lungu; Zhengliang Huang; Jingdai Wang; Yao Yang; Yongrong Yang
      Pages: 1617 - 1631
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Haotong Wang, Musango Lungu, Zhengliang Huang, Jingdai Wang, Yao Yang, Yongrong Yang
      Vortex and electrostatic charges in the gas-solid fluidized bed have a significant influence on its transport abilities and hydrodynamics. In this work, the electrostatic model coupled with energy model has been applied to reveal the electrostatic effect on hydrodynamics, vorticity and local heat transfer coefficients based on the kinetic theory of granular flow. The results indicate that particle vortices change the gas and solid phase interaction around the bubble and enhance the local heat transfer coefficients. Gas interchange decreases by 6.5% compared to Davidson model at the jet velocity of 10 m·s−1 and 13% of 5 m·s−1. After adding electrostatic charges, bubble diameter decreases with the increasing specific charges. Furthermore, vorticity at the initial stage of bubble formation is larger and the particle vortex diffuses to a large extent. The simulation results can be applied to modify and estimate the overall heat transfer coefficient of the fluidized bed reactor and provide the basis for studying the effect of electrostatic effect on heat transfer.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.026
       
  • Preparation and application of monodisperse spherical
           polymethylsilsesquioxane (PMSQ) beads by sol-gel method
    • Authors: Franklin Chau-Nan Hong; Cyun-Jhe Yan
      Pages: 1632 - 1639
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Franklin Chau-Nan Hong, Cyun-Jhe Yan
      We have prepared monodisperse polymethylsilsesquioxane (PMSQ) microspheres with the diameters of 0.5–4 μm in aqueous solution by a sol-gel method. The as-prepared PMSQ beads are modified with hexamethyldisiloxane (HMDSO) under highly acidic conditions to form hydrophobic trimethylsilylated spheres. A continuous lift-up method was developed to perform monolayer self-assembly ordered arrays of the hydrophobic PMSQ microspheres on the large area substrate (>14 cm in length). We further reported a novel patterning method to control the sizes and the pitches of the arrayed microscale patterns independently. The technology to fabricate the large area arrayed microstructures may find applications in the manufacture of flexible micro-devices.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.027
       
  • Efficiency of calcium vapor tunnels on non-contact deoxidation of
           irregular titanium powder
    • Authors: Chon-Il Hong; Jung-Min Oh; Jeshin Park; Jeong-Mo Yoon; Jae-Won Lim
      Pages: 1640 - 1643
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Chon-Il Hong, Jung-Min Oh, Jeshin Park, Jeong-Mo Yoon, Jae-Won Lim
      This study developed a new process for the economical deoxidation of titanium powder in order to solve the problems associated with the previous deoxidation process. In the experiment, titanium powder with an irregular particle shape was used as the raw material with an oxygen concentration of 2100 ppm. The amount of Ca was reduced by 50% as compared to that used in a previous work and placed in an improved apparatus at a weight ratio of 2:1 (Ti:Ca). This modified deoxidation process decreased the oxygen concentration of the titanium powder to 805 ppm at 1273 K, leading to a ∼61.7% reduction of oxygen compared to the raw titanium powder. Low-oxygen irregular titanium powder can be produced at a low cost and high efficiency by applying a non-contact deoxidation process using Ca vapor.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.029
       
  • Facile synthesis of nano-TiO2/stellerite composite with efficient
           photocatalytic degradation of phenol
    • Authors: Xiaolong Hu; Zhiming Sun; Junying Song; Guangxin Zhang; Shuilin Zheng
      Pages: 1644 - 1654
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Xiaolong Hu, Zhiming Sun, Junying Song, Guangxin Zhang, Shuilin Zheng
      In this paper, we report a kind of nano-TiO2/stellerite composite with enhanced photoactivity, which was synthesized by a typical homogeneous precipitation method followed by a calcination crystallization process using natural stellerite as support. The as-prepared composites were characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption, high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The results showed that TiO2 loading amounts and calcination temperatures had significant influence on the adsorption and photocatalytic degradation properties of phenol. Moreover, it was indicated that the TiO2 nanoparticles (NPs) with smaller grain size (around 12.0 nm) and narrower size distributions were uniformly deposited on the surface of stellerite as a layer of film. Compared with commercial P25, the received composite exhibited more superior photocatalytic degradation performance towards phenol. The enhanced photocatalytic degradation performance should result from the better dispersibility of TiO2 NPs and higher separation efficiency of photogenerated electron-hole pairs. This work may set foundation for the practical application of this new composite photocatalyst in the field of wastewater treatment.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.030
       
  • Analysis of particle rotation in fluidized bed by use of discrete particle
           model
    • Authors: Run-Jia Liu; Rui Xiao; Mao Ye; Zhongmin Liu
      Pages: 1655 - 1663
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Run-Jia Liu, Rui Xiao, Mao Ye, Zhongmin Liu
      The particle rotation was found important in the fluidized bed when the heterogeneous structures appeared. Some researches show that Magnus lift force might play an pivotal role in fluid-solid system, especially when the particles have fast rotation speed. As the Magnus lift force is acted at the single particle level, a pseudo two-dimensional discrete particle model (DPM) was used to investigate the influence of Magnus lift force in fluidized bed. The rotational Reynolds number (Re r) bases on the angular velocity and the diameter of the spheres is used to characterize the rotational movement of particles. We studied the influence of Magnus lift force for particles with rotational Reynolds number in the range of 1–100. Our results show that the influence of Magnus lift force is enhanced with a higher Re r. Magnus lift force affects the movement of particles in both radial and axial directions while Re r is high. However, in low Re r case it can be neglected in computational simulation model. This indicates the introduction of Magnus lift force may improve the discrete particle model only in high Re r case and Magnus effect should be considered in real gas-solid two phase system when the particle rotational speed is high.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.032
       
  • Adsorption of BSA onto hexagonal mesoporous silicate loaded by APTES and
           tannin: Isotherm, thermodynamic and kinetic studies
    • Authors: Fatemeh bazzaz; Ehsan Binaeian; Amir Heydarinasab; Arezou ghadi
      Pages: 1664 - 1675
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Fatemeh bazzaz, Ehsan Binaeian, Amir Heydarinasab, Arezou ghadi
      In the present study, hexagonal mesoporous silica (HMS) was synthesized and modified by tannic acid as a natural poly-phenol and amine (TA-A-HMS) and was applied for the adsorption of bovine serum albumin (BSA) from aqueous media. To investigate the structure of HMS and TA-A-HMS, SEM, TEM, XRD, BET and FTIR analysis were applied. The effects of pH, adsorbent dosage, contact time and temperature on the BSA adsorption were studied. After modification, BET surface area of HMS was reduced from 885 m2/g to 51 m2/g which confirms the presence of tannin and amine groups that inhibit the adsorption of nitrogen molecules. According to the results of equilibrium data, it is shown that Langmuir isotherm with maximum adsorption capacity of 1000 mg/g is the predominant model and adsorption is mono-layer. Kinetic and thermodynamic studies also reveal that adsorption kinetic followed by pseudo-second order model and the adsorption process is exothermic.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.001
       
  • Utilizing spray drying technique to improve oral bioavailability of
           apigenin
    • Authors: Mohammad A. Altamimi; Ehab M. Elzayat; Sultan M. Alshehri; Kazi Mohsin; Mohamed A. Ibrahim; Osaid T. Al Meanazel; Faiyaz Shakeel; Fars K. Alanazi; Ibrahim A. Alsarra
      Pages: 1676 - 1684
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Mohammad A. Altamimi, Ehab M. Elzayat, Sultan M. Alshehri, Kazi Mohsin, Mohamed A. Ibrahim, Osaid T. Al Meanazel, Faiyaz Shakeel, Fars K. Alanazi, Ibrahim A. Alsarra
      The aim of this study was to prepare, characterize, and evaluate apigenin in a solid dispersion system to improve the dissolution rate and bioavailability of such poorly soluble drug. Apigenin was dissolved in organic solvent with micelle forming polymer Pluronic F-127 (PL-F127). Solid dispersion of apigenin-PL F-127 was developed using spray drying technique. Physicochemical and in vitro characterization of the produced solid dispersion particles were conducted using scanning electron microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, powder X-ray diffractometry and dissolution study. In addition, in vivo study was performed for the spray dried versus pure and marketed apigenin. Cmax was found to be around 5 folds higher for spray dried product compared to non spray dried materials. The prepared drug:polymer formulation showed elongated particles and complete lack of crystallinity at 1:4 ratio. The change in the vibrational wave numbers strongly suggested the formation of hydrogen bonding between apigenin and PL F-127. Significant increase in the dissolution rate and bioavailability of the spray dried apigenin showed the potential of solid dispersion system to overcome problem related to BCS II drugs.
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      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.002
       
  • Green synthesis and characterization of hexagonal shaped MgO nanoparticles
           using insulin plant (Costus pictus D. Don) leave extract and its
           antimicrobial as well as anticancer activity
    • Authors: Joghee Suresh; Ganeshan Pradheesh; Vincent Alexramani; Mahalingam Sundrarajan; Sun Ig Hong
      Pages: 1685 - 1694
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Joghee Suresh, Ganeshan Pradheesh, Vincent Alexramani, Mahalingam Sundrarajan, Sun Ig Hong
      Green synthesis is an ecofriendly novel technology and attractive research area for the production of metal oxide nanoparticles in bio-medical and chemical applications. The green perspective includes solvents, reductants or stabilizing agents obtained from a natural resource as they are non-toxic and ecofriendly. In this study, a sustainable green synthetic strategy to synthesize magnesium oxide nanoparticles by employing Costus pictus D. Don plant leaf extract as a reducing agent. The successful formation of magnesium oxide nanoparticles was confirmed by comprehensive characterization techniques. The presence of biomolecules and metal oxides were confirmed by Fourier transform Infrared (FT-IR) spectral data analysis. The X-ray diffraction (XRD) revealed the formation of pure cubic MgO crystalline nanoparticles. The surface morphology of MgO particles observed by Scanning electron microscope (SEM) showed the hexagonal-shaped MgO crystallites. The average size of biosynthesized MgO nanoparticles was measured to be around 50 nm by Transmission Electron Microscopy (TEM). The mechanism for the formation of MgO nanoparticles was suggested in this study. The biosynthesized magnesium oxide particles showed good antimicrobial and exhibited maximum inhibition rate for MgO nanoparticles at 200 µg showing efficient anticancer activity.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.003
       
  • Microstructure and property characterization of Al-based composites
           reinforced with CuZrAl particles fabricated by mechanical alloying and
           spark plasma sintering
    • Authors: Lanxiang Zhang; Boyu Li; Hao Wu; Wen Wang; Sicheng Zhai; Juan Xu; Zuozhe Niu; Yan Wang
      Pages: 1695 - 1702
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Lanxiang Zhang, Boyu Li, Hao Wu, Wen Wang, Sicheng Zhai, Juan Xu, Zuozhe Niu, Yan Wang
      In the present work, CuZrAl metallic glass particles were synthesized by mechanical alloying method. High relative density Al-based composites (ABCs) reinforced with different volume fraction of CuZrAl particles have been fabricated by spark plasma sintering (SPS) technique. The microstructures, mechanical properties and corrosion resistance in seawater solution of the ABCs were investigated. The sintered products are all composed of fcc-Al, Al3Zr and CuAl2 phases. For CuZrAl addition, bright and network precipitates are clearly observed in the Al matrix. On account of the interdiffusion of Al and Cu atoms between matrix and reinforcement, the ABCs present the good interfacial bonding. Compared with SPS-ed pure Al bulk, ABCs possess the excellent mechanical properties. It is mainly ascribed to the second phase strengthening, continuously distributed precipitates, high relative density or bonding interface, and grain refinement strengthening. Thereinto, combined with a degree of plastic strain, the composite with 20 vol% CuZrAl reinforcement reveals the best micro-hardness (290 HV), and the highest yield strength and fracture strength of 408 and 459 MPa, respectively. Moreover, the ABCs bear the better pitting resistance with wide passive region in seawater solution.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.004
       
  • Cleaning of high pyritic sulfur fine coal via flotation
    • Authors: Ercan Sahinoglu
      Pages: 1703 - 1712
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Ercan Sahinoglu
      Large quantities of fine coal have been produced during mining and processing activities of coals. Use of these fine coals after cleaning is important in terms of recovering of economically valuable energy source and prevention of environmental pollution. In the present study, amenability of a high ash-sulfur coal sample to flotation process was investigated. Coal particle size and collector dosage were selected as variables. Increasing coal particle size affected sulfur and ash rejections adversely. On the other hand, more combustible matter was recovered at coarser particle sizes. Maximum combustible recovery, ash rejection, pyritic sulfur rejection and sulfate sulfur rejection were achieved to be 82.56%, 82.84%, 90.04% and 81.45%, respectively. Polished section examinations and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) analysis confirmed the rejection of significant level of ash and sulfur from the coal.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.005
       
  • Energy and cement quality optimization of a cement grinding circuit
    • Authors: Okay Altun
      Pages: 1713 - 1723
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Okay Altun
      This study aimed at optimizing both the energy efficiency and the quality of the end product by modifying the existing flowsheet of the cement grinding circuit. As a general application, mill filter stream is sent to the air classifier owing to its coarser size distribution than the desired product. However, the study proved that some further evaluations i.e., quality tests and chemical assays, could make it possible to treat this stream as a final product. Consequently, directing this stream to the final product silo could be considered. Within the study, sampling survey was undertaken initially that was followed by the modelling and simulation works. The calculations implied that the production rate increased by 4.45% that corresponded to energy saving of 4.26%. As the plant decided to change the flow sheet, another sampling campaign was arranged to validate the outputs of the simulation studies. In that case, the real data showed that the increase in production rate was 3.68% and 28-Days strength of the cement improved by 2.9%. As a result, the simulation outputs were found to be in agreement with the real data hence the efficiency of the cement production, both quality and energy, for a given circuit was improved.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.006
       
  • CFD simulations of droplet and particle agglomeration in an industrial
           counter-current spray dryer
    • Authors: M. Jaskulski; P. Wawrzyniak; I. Zbiciński
      Pages: 1724 - 1733
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): M. Jaskulski, P. Wawrzyniak, I. Zbiciński
      In this study, CFD simulations of particle and droplet agglomeration in an industrial counter-current spray dryer are presented. For this purpose, a modified form of the stochastic collision agglomeration model is proposed. This model takes into account droplet–droplet collision as well as wet and dry particle interaction. These events are coupled with heat, mass and momentum transfer. A comprehensive moisture evaporation model based on the concept of characteristic drying curve (CDC) was applied to predict the drying kinetics of the detergent slurry. Due to high instability in air flow inside the drying chamber, simulations were carried out under transient condition. A comparison between time-averaged simulation results and measurements, which were performed on an industrial spray drying installation, shows a good agreement. This finding proves the correctness of the developed agglomeration and drying models. The presented methodology of CFD simulations of agglomeration can be used to design or optimise spray-drying installations and to predict the final particle size distribution of the product.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.007
       
  • The joint mixing action of the static pre-mixer and the rotating drum
           mixer – Discrete element method approach
    • Authors: Lato Pezo; Milada Pezo; Aca Jovanović; Radmilo Čolović; Đuro Vukmirović; Vojislav Banjac; Olivera Đuragić
      Pages: 1734 - 1741
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Lato Pezo, Milada Pezo, Aca Jovanović, Radmilo Čolović, Đuro Vukmirović, Vojislav Banjac, Olivera Đuragić
      In this study, the mixing performance of coupled mixing action of the Komax static mixer (which is used as a pre-mixer) and rotating drum (applied as the final mixer) was explored in the maize meal mixing operation. The main objective of this paper was to predict the behaviour of the previously grinded maize particles, during the mixing process in static mixer and drum mixer, and to explore the possibilities to shorten the mixing time in the main mixer (in order to reduce the energy consumption). Three different experiments were performed: in the first experiment, possibilities of static mixer were explored, second experiment showed the mixing performance of rotating drum, and the combination of these two mixing devices was investigated in the third experiment. Homogeneity of the obtained mixtures was determined experimentally, by the “Microtracers” method. The Discrete Element Method was used for modelling of granular flow in the pre-mixing and final mixing applications, and to predict the inter-particle mixing quality within a static mixer and the rotating drum mixer. The results of the numerical simulation are compared with appropriate experimental results. The possible industrial application of this model could be the optimization of parameters of mixing systems taking into account the quality and the duration of the mixing process.
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      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.008
       
  • Microstructural characterization of Mg-SiC nanocomposite synthesized by
           high energy ball milling
    • Authors: S. Kamrani; D. Penther; A. Ghasemi; R. Riedel; C. Fleck
      Pages: 1742 - 1748
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): S. Kamrani, D. Penther, A. Ghasemi, R. Riedel, C. Fleck
      High-energy ball milling is successfully used to produce magnesium matrix nanocomposites reinforced with SiC nanoparticles. Changes in morphology and microstructural features of the milled powders were characterized in order to highlight advantages of the mechanical milling process and evaluate the role of the SiC nanoparticles. It was observed that with increasing volume fraction of SiC nanoparticles, a finer nanocomposite powder with more uniform particle size distribution is obtained. A homogeneous distribution of SiC nanoparticles, even up to 10% volume fraction, in magnesium matrix after 25 h milling was confirmed by elemental mapping and TEM results. The analysis of the XRD patterns accompanied by dark-field TEM images revealed that magnesium crystallites refine to fine nanocrystalline sizes after the mechanical milling. The results showed that the crystallite size of the magnesium matrix reduced with increasing SiC nanoparticle content in addition to the induced lattice strain.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.009
       
  • Numerical analysis of nanofluid flow inside a trapezoidal microchannel
           using different approaches
    • Authors: Talieh Sheikhalipour; Abbas Abbassi
      Pages: 1749 - 1757
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Talieh Sheikhalipour, Abbas Abbassi
      In this study, developing laminar forced convection of Al 2 O 3 /water nanofluid flow inside a trapezoidal microchannel has been investigated. The numerical simulation is conducted using two different methods which consider the effect of non-uniform nanoparticle distribution: Buongiorno’s Two-component nonhomogeneous model, and Eulerian-Lagrangian two-phase method. The results are compared to experimental data and also single-phase and dispersion methods. It is shown that the Eulerian-Lagrangian method predicts microchannel Nusselt number more accurately than Buongiorno’s model. Particle distribution is not uniform in the cross section of microchannel, and with increasing Reynolds number this nonuniformity is more. Moreover, the effect of different forces on heat transfer is discussed. It is found that the influence of Saffman’s lift force is negligible while Brownian and thermophoretic forces affect the heat transfer coefficient slightly. Furthermore, it is shown that the use of experimental correlation for nanoparticle Nusselt number makes the numerical results more accurate, so it is important to take into account the scale effects and use the suitable correlations.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.010
       
  • Agglomerate behavior in a recirculating fluidized bed with sheds: Effect
           of sheds
    • Authors: Francisco J. Sanchez Careaga; Cedric Briens; Franco Berruti; Jennifer McMillan; Murray Gray
      Pages: 1758 - 1770
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Francisco J. Sanchez Careaga, Cedric Briens, Franco Berruti, Jennifer McMillan, Murray Gray
      A Radioactive Particle Tracking (RPT) technique was used to study the effects of the internal baffles in the stripping section of the Fluid Coker™, called sheds, have on the behavior of wet agglomerates that are formed when residual oil is injected into the Coker. Vapor emitted by reacting wet agglomerates below the sheds rises and causes shed fouling. The release of vapor from agglomerates can be estimated by combining the RPT results with a coking reaction model. The study found that the sheds reduce the time agglomerates spend in the shed zone, which in turn reduces the amount of organic vapor that reaches the sheds, but at the same time increase the wetness of the agglomerates that exit to the recirculation line, which results in the loss of valuable liquid. The research also found that the best type of shed, from the point of view of agglomerate motion, is the mesh-shed. Finally, experimental data indicate that reducing the cross sectional area of the sheds from 50% to 30% increases the time that the agglomerates spend above the shed zone, and thus reduces the flow of vapor emitted below the sheds.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.04.011
       
  • Particulate structures produced by electrosprays of colloidal silica
           suspensions in both negative and positive zeta potentials
    • Authors: Ferry Faizal; Suryani Saallah; I. Wuled Lenggoro
      Pages: 1771 - 1777
      Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7
      Author(s): Ferry Faizal, Suryani Saallah, I. Wuled Lenggoro
      Interaction between surface charge (zeta potential) of colloidal silica nanoparticles and the charge-induced droplets suspended in the gas phase by electrospray is investigated for the first time based on the particle physical (morphology, size, and size distribution) and optical properties. Colloidal silica nanoparticles having negative and positive zeta potential were subjected to electrospray in both negative and positive mode, and deposited on a substrate (silicon wafer). Visual observation of the substrate with particle deposition shows various white shades, corresponding to the changes in optical properties, as supported by the ultraviolet-visible–near-infrared spectroscopy. Microscopic analysis revealed the strong correlation between the colloid surface charge and charging mode (positive or negative) of the sprayed droplets to the particle morphology and size. The findings of the present study demonstrate the capability of the electrospray method to tune the physical and optical properties of colloidal silica nanoparticles with different surface charges.
      Graphical abstract image

      PubDate: 2018-05-28T23:40:42Z
      DOI: 10.1016/j.apt.2018.03.015
       
  • Novel powder packing theory with bimodal particle size
           distribution-application in superalloy
    • Abstract: Publication date: Available online 20 June 2018
      Source:Advanced Powder Technology
      Author(s): Xianjue Ye, Yunping Li, Yanling Ai, Yan Nie
      Powder packing behavior plays an important role in determining sintering ability of powder and the resultant performance of materials. In this study, a novel powder packing theory with bimodal particle size distribution is proposed by considering the loosening effect, wall effect and wedging effect. This theory is applied in PM nickel base superalloy by using mixture of coarse particles and fine particles. Microstructures of alloy sintered by vacuum hot pressing (HP) are observed by optical microscope (OM) and electron backscatter diffraction (EBSD). The prediction result by this theory is in good agreement with the experimental results. The enhanced sintering ability of powder containing appropriate fractions of coarse particle and fine particle is ascribed to the filling of fine particles to the voids between coarse particles, which enhanced the packing density theory. Tensile behavior and the fracture morphology of alloys with various particle distributions are analyzed in details, suggesting the higher reliability of the present theory.
      Graphical abstract image

      PubDate: 2018-06-21T01:16:13Z
       
  • Inside Front Cover (Aims & Scope, Editors)
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8


      PubDate: 2018-06-18T01:04:24Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8


      PubDate: 2018-06-18T01:04:24Z
       
  • The relationship between iron and Ilmenite for photocatalyst degradation
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Ru Bin Lee, Kian Mun Lee, Chin Wei Lai, Guan-Ting Pan, Thomas C.K. Yang, Joon Ching Juan
      Photocatalytic degradation of organic compounds is a key target for the development of sustainable environmental pollution management system. The use of pre-treated Ilmenite with low concentration of Fe ions via single step of chloride process is essential to generate a highly effective photocatalyst. In the present study, comprehensive investigations on Fe concentrations in Ilmenite has been conducted. Based on the findings, pre-treated Ilmenite with low Fe content (0.76–7.15 at%) was successfully synthesized through a single step chloride process by using 15–35 v/v% of HCl. Interestingly, Ilmenite with 1.62 at% Fe after pre-treated with 25 v/v% HCl was able to photodegrade 100% of the Reactive Black 5 (RB5) under visible light within 30 min. The improvement of photocatalytic degradation efficiency of the pre-treated Ilmenite is mainly attributed to the better photo-induced charge carrier mobility and low recombination losses.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Investigation to rectangular flat pleated filter for collecting corn straw
           particles during pulse cleaning
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Mingxing Zhang, Haiyan Chen, Cuiping Yan, Qianqian Li, Jie Qiu
      This work investigated the amounts of dust residual of a rectangular flat pleated filter for collecting corn straw particles during pulse cleaning and attempted to explore the causes of incomplete cleaning. In this study, dust residual, filter’s pressure drops and static peak pressures were obtained across flat pleated filter during the pulse cleaning. The optimum parameters were obtained that the pulse electromagnetic valve size was one inch, the pulse pressure was 0.2–0.3 MPa, and the filtration velocity was 0.6 m/min for the nozzle type with 7 holes with a diameter of 7 mm (7 × Ф7 mm). Under this condition, the experimental results show that the dust residuals were 198.4 (64%), 52.7 (17%), 58.9 (19%) g for initial collected dust residual 310 g at top, middle and bottom areas of the filter panel, respectively. The dust residuals were major on the top area of the filter panel, especially on the gap locations between the two-adjacent pulse airflows. Meanwhile, the more pulse interval or dust concentration was increased the dust residuals of the filter panel and the pressure drops of the filter were increased. Moreover, the static peak pressure distribution can give guidance to the dust residual distribution.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Structure and mechanical properties of TiB2/TiC – Ni composites
           fabricated by pulse plasma sintering method
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): K. Cymerman, D. Oleszak, M. Rosinski, A. Michalski
      TiB2/TiC – Ni composites were synthesized starting from the powders of Ti, B4C and Ni, using Pulse Plasma Sintering (PPS) method. Typically used one-step (1100 °C–10 min.) and novel double-step sintering processes (900 °C–10 min. +1100 °C–5 min.) were applied and compared. XRD studies showed that the composite obtained by double-step sintering consisted of TiB2, TiC and Ni phases. For one-step processing additionally undesired Ni3B and graphite were detected. SEM observations revealed dark-grey grains of TiB2, light-grey grains of TiC (both around 25 µm in size) and Ni areas surrounded by TiC. The composites synthesized in one- and double-step processes revealed the hardness and relative density of 2335 HV5 (±110) and 97.8% and 2470 HV5 (±70) and 99.8%, respectively. Novel double-step sintering process allowed to avoid undesired phases (graphite, Ni3B) and only TiB2, TiC and Ni were present in the structure. Additionally it was possible to decrease the temperature of the process comparing to other fabrication methods.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • A fast and facile microwave irradiation method for the synthesis of
           ZnO@ZrO2 core-shell nanocomposites and the investigation of their optical
           properties
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Md. Obaidullah, Takeshi Furusawa, Iqbal Ahmed Siddiquey, Newaz Mohammed Bahadur, Masahide Sato, Noboru Suzuki
      ZnO@ZrO2 core-shell nanocomposites (NCs) were prepared by a novel and accessible path employing microwave (MW) irradiation to regulate photocatalytic property of ZnO. The synthesized ZnO@ZrO2 NCs were further examined to discern their optical and chemical properties by FT-IR, XPS, XRF, XRD, FE-SEM, EDX, TEM, UV–vis, and PL analysis. XPS data analysis confirmed the presence of zirconium and oxygen on the coated surface. An almost similar zeta potential curve was observed for the pure ZrO2 and ZrO2 coated ZnO NCs, predicting the presence of the ZrO2 layer on ZnO. Photoluminescence studies show the enhanced intensity of ZnO@ZrO2 nanostructure compared to uncoated ZnO. Photocatalytic activity of ZnO could be controlled by the amorphous ZrO2 layer, which was guaranteed by the photo mineralization of methylene blue under UV irradiation at room temperature.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • The effects of morphology on physicochemical properties, bioactivity and
           biocompatibility of micro-/nano-bioactive glasses
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Qing Hu, Weihui Jiang, Yuli Li, Xiaofeng Chen, Jianmin Liu, Ting Chen, Guohou Miao
      We prepared micro-/nano-bioactive glasses (MNBG) with controlled morphologies by using a sol-gel method combined with a template (CTAB) centered self-assembly technology, and investigated the effect of the MNBG morphology on physicochemical properties, apatite-forming ability and biocompatibility. Results showed that the specific surface area of rod-like MNBG (RBG) with highly ordered mesoporous structure was higher than that of spherical MNBG (SBG) with irregular worm-like mesoporous structure. Both the MNBG showed the high apatite-forming ability, and the apatite-forming ability of RBG with higher specific surface area was higher than that of SBG. Futhermore, both SBG and RBG had good biocompatibility, could promote proliferation and ALP differentiation of human dental pulp cells (HDPCs), and SBG with a smaller aspect ratio could significantly increase the proliferation and differentiation of the cells, as compared to RBG. This study may motivate the development and applications of MNBG with controllable morphology in dental repair.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Mechanochemical synthesis, structural, magnetic, optical and
           electrooptical properties of CuFeS2 nanoparticles
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Erika Dutková, Zdenka Bujňáková, Jaroslav Kováč, Ivan Škorvánek, María Jesus Sayagués, Anna Zorkovská, Jaroslav Kováč, Peter Baláž
      The rapid mechanochemical synthesis of nanocrystalline CuFeS2 particles prepared by high-energy milling for 60 min in a planetary mill from copper, iron and sulphur elements is reported. The CuFeS2 nanoparticles crystallize in tetragonal structure with mean crystallite size of about 38 ± 1 nm determined by XRD analysis. HRTEM study also revealed the presence of nanocrystals with the size of 5–30 nm with the tendency to form agglomerates. The Raman spectrum confirms the chalcopyrite structure. Low temperature magnetic data for CuFeS2 support the coexistence of antiferromagnetic and paramagnetic spin structure. Moreover, the hysteresis loops taken at temperatures from 5 K to 300 K revealed a presence of very small amount of ferromagnetic phase, which seems to be associated with the non-consumed elemental Fe in as-prepared nanoparticles. The optical band gap of CuFeS2 nanoparticles has been detected to be 1.05 eV, larger than band gap of the bulk material. The wider gap possibly resulted from the nano-size effect. Photoresponses of CuFeS2 nanoparticles were confirmed by I-V measurements under dark and light illumination. It was demonstrated that mechanochemical synthesis can be successfully employed in the one step preparation of nanocrystalline CuFeS2 with good structural, magnetic, optical and electrooptical properties.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Synthesis of Ag-AgBr/Al-MCM-41 nanocomposite and its application in
           photocatalytic oxidative desulfurization of dibenzothiophene
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Xuan Nui Pham, Ba Manh Nguyen, Hoa Tran Thi, Huan Van Doan
      A series of Ag-AgBr/Al-MCM-41 nanocomposites were synthesized by dispersion of Ag-AgBr on mesoporous silica Al-MCM-41 obtained from natural bentonite. The synthesized Ag-AgBr/Al-MCM-41 composites with Ag nanoparticles growing on the surface of Al-MCM-41 were used for photocatalytic oxidative desulfurization of dibenzothiophene. The physical properties of Ag-AgBr/Al-MCM-41 were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Ultraviolet–visible diffuse reflection spectroscopy (UV–Vis DRS), photoluminescence (PL) emission spectra, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity results showed that in the presence of 40% Ag-AgBr/Al-MCM-41 photocatalyst the oxidative desulfurization of dibenzothiophene reached the maximum efficiency at 99.22% and the photocatalytic activity still keeps high level after four cycles.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Influence of process control agent type on the mechanosynthesis of Fe3O4
           particles
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): H.F. Chicinaş, T.F. Marinca, B.V. Neamțu, G. Conțiu, O. Isnard, I. Chicinaş
      The influence of the nature of the process control agent (PCA) used in the mechanosynthesis of the magnetite nanoparticles has been studied. The two-step route used here for obtaining nanocrystalline/nanoparticles Fe3O4 consists of a heat treatment, to prepare well-crystallised magnetite, followed by the mechanosynthesis process. Dry milled magnetite samples have been obtained as a reference, using the same conditions (duration and energy), to determine the influence of the process control agents (PCA). Three different PCAs have been used: benzene, ethanol and oleic acid. The characterisation of the magnetite particles has been performed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), magnetic measurements M(H), differential scanning calorimetry (DSC) and thermogravimetric (TG) measurements and Scanning Electron Microscopy (SEM). XRD and SEM analysis revealed a different processing mechanism for the two milling modes, wet and dry. In the case of dry milling, even for short milling times, iron contamination and formation of a wüstite – FeO phase is noticed. The use of the PCA during the milling process limits the above-mentioned contamination. Ethanol and benzene uses as PCA lead to synthesis of fine uniform sized particles. SEM images reveal the presence on nanoparticles. In the case of oleic acid, DSC, TG and magnetic measurements revealed the presence of a thin layer of oleic acid adsorbed on the particles. FTIR analysis highlighted the presence of both free and bonded oleic acid. The magnetisation of the samples was found to be linked to the powder contamination (FeO or oleic acid), structural defects or finite size effects.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Numerical simulation of gas-solid flow in a novel spouted bed: Influence
           of row number of longitudinal vortex generators
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Feng Wu, Jiejie Zhang, Xiaoxun Ma, Wenjing Zhou
      The flow characteristics in a novel cylindrical spouted bed with spherical longitudinal vortex generators is numerically investigated by two-fluid model (TFM) with kinetic theory for granular flow, the longitudinal vortex technology is adopted in the spouted bed so as to strengthen the particles radial mixing between spout and annulus zones, the row number effect (1–3 rows) of longitudinal vortex generators (LVGs) on gas–solid flow behavior in three dimensional spouted beds was numerically simulated. The CFD results show that, longitudinal vortices can effectively increase particle volume fraction near annulus zone in the spouted bed, the maximum increase of particle volume fraction near annulus region is 183%, and the pressure drop in spouted beds increases with increasing of LVGs’ row number. There exists an optimal row number (equal 2) of LVGs, at witch the radial velocity of particle phase reaches maximum in the limited spouted bed space, the value of turbulent kinetic energy of gas phase in spouted bed can be significantly promoted by longitudinal vortex, espeically in the spout zone and near the annulus region. Also, the enhancement effect of multi-row LVGs on turbulent kinetic energy of gas phase decreases when the cross section height of spouted beds increases.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Detonation spraying behaviour of refractory metals: Case studies for Mo
           and Ta-based powders
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Vladimir Yu. Ulianitsky, Igor S. Batraev, Alexandr A. Shtertser, Dina V. Dudina, Natalia V. Bulina, Igor Smurov
      In thermal spraying of refractory metal powders, two major issues need to be solved: particles of materials having high melting temperatures should be heated to reach a semi-molten/molten state or temperatures close to the melting point, while oxidation of the metals should be prevented. It has long been believed that it is rather difficult, if not impossible, to produce high-quality refractory metal coatings by detonation spraying. In this work, we demonstrated the capability of the detonation spraying method to produce tantalum-based and molybdenum coatings of low porosity. Using a computer-controlled detonation spray (CCDS2000) facility, the detonation spraying behaviour of a molybdenum powder and a partially oxidized tantalum powder was studied. Spraying was conducted onto steel substrates using an acetylene-oxygen mixture with O2/C2H2 = 1.1. The spraying process was studied by means of analyzing the splat morphology and calculating the particle temperatures and velocities. According to the X-ray diffraction phase analysis, the metals did not experience oxidation during the deposition. Rather, partial reduction of the oxide phase contained in the Ta-based powder occurred during spraying.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Effect of CNTs on morphology and electromagnetic properties of non-firing
           CNTs/silica composite ceramics
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Bo Peng, Chika Takai, Hadi Razavi-Khosroshahi, M S EL Salmawy, Masayoshi Fuji
      Carbon composite ceramics have much attention for industry because of their excellent properties such as strong toughness, high electrical conductivity as well as low percolation threshold. Therefore, carbon nanotubes (CNTs) were used to incorporate with silica ceramics in order to improve their electromagnetic properties. The amount of CNTs in CNTs/silica composite ceramics was varied in order to investigate its effect on morphologies and electromagnetic properties of those. The composites were successfully fabricated by non-firing process. The results revealed that the obtained CNTs/silica composite ceramic have an electrical resistivity of 66.6 Ω·cm with a bending strength of 13.8 MPa. At the same time, the electromagnetic wave absorption ability achieved 70% over a wild frequency. This indicates that the CNTs in CNTs/silica composite ceramics may be potentially applied for an electromagnetic wave reflective material.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Effect of microwave heating on the microstructures and kinetics of
           carbothermal reduction of pyrolusite ore
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Qianxu Ye, Jin Chen, Guo Chen, Jinhui Peng, C. Srinivasakannan, Rongsheng Ruan
      This article focuses on the development of phase transformation and morphology of low-grade pyrolusite during carbothermal reduction using microwave heating. The XRD, SEM and EDS results show that selective carbothermal reduction of MnxOy and FexOy in pyrolusite is easy to realize with microwave heating, which can reduce MnO2 to MnO, and Fe2O3 to Fe3O4, rather than FeO. It was also observed that the phases of Mn2O3, Mn3O4 and MnO appear at 300 °C, 450 °C and 500 °C, respectively. The MnO phase, formed by the accumulation of MnO sphere particle with a diameter of 266.75–420.05 nm, is loose and porous. At a temperature of 750 °C, the Mn2SiO4 layer of about 316 nm in thickness, tightly wrapping SiO2 particle is generated at the interface between MnO and SiO2 embedded with MnO. Above 650 °C, Fe2O3 in pyrolusite can be transformed into a very dense Fe3O4 phase.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Optical and photocatalytic properties of the Fe-doped TiO2 nanoparticles
           loaded on the activated carbon
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Akbar Eshaghi, Halimeh Moradi
      In this work, Fe-doped (1 wt%) TiO2 loaded on the activated carbon nano-composite was prepared using a sol-gel method. A prepared nano-composite was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), BET surface area, Fourier transform infrared spectroscopy (FTIR), photoluminescence (PL) spectroscopy and UV–Vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the nano-composite was evaluated through degradation of synthetic textile wastewater, reactive red 198, under visible light irradiations. The XRD result indicated that the TiO2 nano-composite contained only anatase phase. The surface area of the TiO2 increased from 48 m2/g to 100 m2/g through the fabrication of the nano-composite. The FE-SEM results indicate that the TiO2 particles with an average particle size of 35–70 nm can be deposited homogeneously on the activated carbon surface. DRS showed that the Fe doping in the TiO2 -activated carbon nano-composite induced a significant red shift of the absorption edge and then the band gap energy decreased from 3.3 to 2.9 eV. Photocatalytic results indicated that the photocatalytic activity of the Fe doped TiO2 increased under visible light irradiation in the presence of the activated carbon.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • A study of selective flotation recovery of rare earth oxides from hematite
           and quartz using hydroxamic acid as a collector
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): George Blankson Abaka-Wood, Jonas Addai-Mensah, William Skinner
      Monazite is a major rare earth elements (REE)-bearing phosphate mineral predominantly found in association with hematite and quartz in some Australian rare earth deposits. The flotation of rare earth oxides (REO) in monazite from mixtures containing monazite, hematite, and quartz with hydroxamic acid as a collector has been investigated using an IMN microflotation cell and a 1.2 L Denver flotation cell. Maximum flotation recovery of both monazite and hematite was attained at pH 7, whereas that of quartz, at pH 3. The flotation kinetics data indicated the need for depressants to achieve selective REO recovery from hematite and quartz mixtures. Sodium silicate and starch were thus tested as depressants of both hematite and quartz. The separation efficiency of REO in the absence of depressants was low and averaged 6.42% at 99% REO recovery, but could be increased to 44.78% with corresponding 93% REO recovery when 4000 g/t starch was used. However, the efficiencies of REO separation obtained with sodium silicate were generally lower (<18%), due to higher gangue minerals content in the flotation concentrates. A blend of sodium silicate and starch showed a good performance for REO recovery, with enhanced selectivity against hematite and quartz through a rougher-cleaner flotation test. This study presents the feasibility of upgrading REO from iron-oxide rich tailings using hydroxamic acid, in the presence of sodium silicate and starch as depressants.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Non-firing ceramics: Activation of silica powder surface for achieving
           high-density solidified bodies
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Yuki Nakashima, Hadi Razavi-Khosroshahi, Chika Takai, Masayoshi Fuji
      Sintering of most ceramic materials requires high temperatures over 1000 °C due to their high melting point. Sintering is a high-cost process, which can take several hours or days. Also, sintering at high temperatures can affect the microstructure of ceramics by causing undesired grain coarsening or changing the chemical stoichiometry of final product when volatile elements are present. In this study, a so-called “non-firing sintering” of silica particles is proposed, without using thermal energy. This method involves the chemical activation of powder surface via ball milling, where the surface of particles is rubbed against balls, and friction between particle/ball breaks the bonds of functional groups like SiOSi on the surface of particles. Results show that water adsorption increases as milling time is increased, while particle size is unchanged after ball milling according to nitrogen adsorption isotherms. Scanning electron microscopy results confirm the trans granular fracture of pellets prepared by ball milling, and transmission electron microscopy micrographs show a necking-like bonding between silica particles.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Develop an effective oxygen removal method for copper powder
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Lei Zhao, Xuhu Zhang, Taiqing Deng, Jun Jiang
      At present, one of crucial limitations for the hot isostatically pressed (HIPed) Cu-3Ag-0.5Zr alloy, which is used on the combustion chamber liner of aerospace engine, is the high oxygen content, which easily results in the intergranular fracture under high temperature, pressure, liquid hydrogen and oxygen environment during operation. In this study, a novel effective oxygen control method is developed, for which vacuum degassing process is integrated with a flowing hydrogen reduction reaction at an elevated temperature before HIP. For this technique, a container is designed with two gas pipes for hydrogen inflow and outflow, so the hydrogen circulation can be established. Allowing hydrogen to react effectively with oxygen, the oxygen content of HIPed alloy is found to drop significantly from 140 ppm (raw powder) to 28 ppm, which is equivalent to the oxygen-free copper and copper alloys. As a result of the reduction, no prior particle boundaries could be observed in the low oxygen content material. Although the tensile strength of the materials with and without employing this technique does not vary significantly, the ductility of low oxygen content material has improved by about 70% at 500 °C. This significant improvement of ductility is critical to ensure the safety critical PM components.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • Formulation of olanzapine nanosuspension based orally disintegrating
           tablets (ODT); comparative evaluation of lyophilization and
           electrospraying process as solidification techniques
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Neelima Anup, Shreya Thakkar, Manju Misra
      Olanzapine (OLAN) as an antipsychotic agent has shown its potential in effective management of psychotic disorders however its use is limited because of its poor water solubility. The aim of present work was to improve solubility of OLAN by developing a stable nanocrystal based orally disintegrating tablets (ODTs), using hyperomellose as potential stabilizer. Comparative evaluation of electrospraying and lyophilization as solidification techniques was carried out to assess its effect on solid state properties of OLAN nanocrystals before transformation to ODTs. OLAN Nanosuspension was developed using antisolvent precipitation method and exhibited particle size, polydispersity index and zetapotential value of 223.1 ± 1.5 nm, 0.105 ± 0.4 and −17.9 ± 3.5 mV respectively. Solid powders obtained from both the solidification techniques were compared in terms of size after re-dispersion, particle morphology, surface area, pore volume and solid state of drug present. Subsequently ODTs were prepared from these powders with needful excipients and % amount dissolved was evaluated. Rate of dispersion was found to be higher for ODTs prepared using lyophilized powder (∼84% in 5 min) while other characterization parameters were comparatively similar. Overall, Lyophilization resulted in powders with better bulk level properties in comparison to electrospraying process.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • One-pot synthesis of oleic acid modified monodispersed mesoporous TiO2
           nanospheres with enhanced visible light photocatalytic performance
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Junkai Cao, Xue-Zhi Song, Xiaolan Kang, Zideng Dai, Zhenquan Tan
      Herein, we report a facile one-pot solvothermal method to prepare unique oleic acid (OA) modified monodispersed mesoporous TiO2 nanospheres with carboxylate ligands from the oleic acid in the bidentate chelating linkage mode. The mesoporous OA-TiO2 nanospheres have a very large specific surface of nearly 510 m2/g. The oleic acid cannot only act as a binding ligand to control the shape of mesoporous TiO2 nanospheres, but also be benefit to enhance the visible-light absorption. The mesoporous OA-TiO2 nanospheres exhibit an excellent photocatalytic performance in the degradation of Rhodamine B and phenol under the visible light irradiation and show almost no attenuation after four cycles.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • ZnCo2O4 nanorods as a novel class of high-performance adsorbent for
           removal of methyl blue
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Kejun Lin, Ming Qin, Xingguo Geng, Liuding Wang, Hongjing Wu
      Spinel ZnCo2O4 nanorods were synthesized by a simple template-free hydrothermal method in the presence of zinc chloride, cobalt chloride, glucose, and urea. The phase structure, morphology and chemical composition have been characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED). The results showed that the typically porous and poly-crystalline structure was successfully grown on the surface of ZnCo2O4 nanorods. The ZnCo2O4 nanorods were further applied to remove methyl blue (MB), which was used as a model of organic pollutants in aqueous solution. In particular, the maximum equilibrium adsorption capacity of MB in ZnCo2O4 nanorods reaches up to 2400 mg/g, which is higher than that of most adsorbents. The adsorption isotherms and kinetics followed standard Langmuir and pseudo-second-order models, respectively. MB adsorption decreased with increasing solution pH at pH > 7 implying that MB adsorption on ZnCo2O4 nanorods may via chemisorption between negatively charged MB molecular and positively charged adsorption sites on the surface of ZnCo2O4 nanorods. This study provides great promise of using ZnCo2O4 nanorods as adsorbent for removal of pollutant dyes.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • In situ study of aggregate sizes formed in chalcopyrite-quartz mixture
           using temperature-responsive polymers
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8
      Author(s): Wei Sung Ng, Luke A. Connal, Elizaveta Forbes, Krishna Mohanarangam, George V. Franks
      An interesting property of temperature-responsive polymers, such as poly(N-isopropylacrylamide) (PNIPAM), is the ability to behave as flocculants above a lower critical solution temperature (LCST). This study examines the aggregation of a chalcopyrite-quartz mixture using a sulfide-selective temperature-responsive polymer, P(NIPAM-co-ethyl xanthate methacrylate (EXMA)) in a continuously-sheared suspension, relative to polyacrylamide (PAM). The investigation was carried out in situ using imaging and Focused Beam Reflectance Measurement techniques to obtain real-time chord length distributions. While particle aggregates were observed in the presence of PNIPAM only upon heating above the LCST, P(NIPAM-co-EXMA) induced particle aggregation below the LCST, due to the attraction between the xanthate moiety and the sulfide surfaces. The largest aggregates were observed with P(NIPAM-co-EXMA) (1.5 MDa), followed by PNIPAM, PAM, and P(NIPAM-co-EXMA) (115 kDa). Particle aggregates formed with PAM did not exhibit further breakage under increasing shear to 1100 s−1, while large-scale fragmentation was observed with the PNIPAM-based flocculants. Unlike PNIPAM, addition of P(NIPAM-co-EXMA) to suspension above the LCST was able to yield particle aggregation, attributed to the formation of charge-stabilised micelles. The influence of the shear rate on the size of the aggregates formed with P(NIPAM-co-EXMA) is unaffected by the polymer addition and measurement temperature below or above the LCST.
      Graphical abstract image

      PubDate: 2018-06-18T01:04:24Z
       
  • APT Distinguished Paper Award 2017
    • Abstract: Publication date: August 2018
      Source:Advanced Powder Technology, Volume 29, Issue 8


      PubDate: 2018-06-18T01:04:24Z
       
  • Inside Front Cover (Aims &amp; Scope, Editors)
    • Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7


      PubDate: 2018-05-28T23:40:42Z
       
  • Full title (Editorial Board Members)
    • Abstract: Publication date: July 2018
      Source:Advanced Powder Technology, Volume 29, Issue 7


      PubDate: 2018-05-28T23:40:42Z
       
 
 
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