Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 52, Issue 2
Displaying 1-5 of 5 articles from this issue
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Original Paper
  • Mechanochemically-assisted Synthesis of LaVO4 and LaVO3
    Osami Abe, Kasumi Sakane, Sensyu Mitachi, Tomoe Yamada, Tadashi Ba ...
    2015 Volume 52 Issue 2 Pages 64-71
    Published: February 10, 2015
    Released on J-STAGE: February 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.64
    JOURNAL FREE ACCESS
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    Mechanochemical synthesis and solvothermal crystallization of LaVO4 and LaVO3 have been studied. Amorphous LaVO4 powders were mechanochemically synthesized by the mixing-grinding operation of La2O3 and V2O5 in Acetone containing water as the grinding liquid. The amorphous ground products were crystallized to monoclinic-LaVO4 by the solvothermal post treatment at 120℃ for 12 h. The BET surface area of the LaVO4 powder after the calcination at 600℃ was 9.6～26.3 m2 g-1. The reflux treatment was also applicable to the crystallization. For the synthesis of LaVO3, the mechanochemical reduction of V2O5 in organic vapors was applicable. The ground product prepared by mixing-grinding of La2O3 and V2O5 in acetone vapor was crystallized to the single phase tetragonal-LaVO3 after the calcination at 800℃ in Ar, although the mechanochemical/solvothermal products contained a certain amount of LaVO4 after the calcination at the same condition.
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  • Development of an Iron Oxide Particle Catcher in Water Using Resin Material
    Shigeru Iijima, Seiji Noda, Kazuhiro Miya, Seiji Furukawa
    2015 Volume 52 Issue 2 Pages 72-79
    Published: February 10, 2015
    Released on J-STAGE: February 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.72
    JOURNAL FREE ACCESS
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    Iron oxide deposition on resin material was investigated in order to develop an iron oxide particle catcher for the plate heat exchanger of water cooling system, preventing thin water channels from being clogged. It was revealed that acrylonitrile-butadiene-styrene （ABS） resin captured a large amount of iron oxide by experimental results using artificial hematite suspension. Moreover, dependency of surface roughness of ABS on iron oxide deposition was quantitatively evaluated. As a result, it was found that mass of the hematite deposit in an arithmetic average roughness of 7.7μm or more was 15 times as much as that in a roughness of 0.44μm. Further analysis of ABS surface clarified that good deposition of rough ABS surface is probably brought by big holes with a width from 50 to 80μm and a depth from 30 to 50μm, since hematite particles easily flow in and deposited on inner walls with these holes.
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Review: Frontier Research Series
  • Creation of Functional Particles Using Crystallization at Liquid-liquid Interface
    Kazunori Kadota
    2015 Volume 52 Issue 2 Pages 80-85
    Published: February 10, 2015
    Released on J-STAGE: February 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.80
    JOURNAL RESTRICTED ACCESS
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    Liquid-liquid interfacial crystallization has been developed as a new crystallization method. This method makes it possible to produce the asymmetric crystals, porous particles and composite particles.
    In this paper, the principle of liquid-liquid interfacial crystallization was introduced using measuring the electric conductance and molecular dynamics simulation at interface. The crystal growth or particle morphology was controlled by difference of the mutual solubility between water and organic solvent. The asymmetric NaCl crystals were created at the liquid-liquid interface using the mutual solubility. The glycine/silica particles were produced since glycine crystals were precipitated on the silica surface by atomizing process based on the liquid-liquid interfacial crystallization. Moreover, the porous alanine particles were produced with an inkjet nozzle. Adjusting the droplet size in the crystallization with an inkjet nozzle was found to be feasible for controlling particle size of alanine.
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Fundamentals of Powder Technology, 2nd Edition
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