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 49, Issue 8
Displaying 1-4 of 4 articles from this issue
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Original Paper
  • Evaluation of Composite Cathode Materials for Solid Oxide Fuel Cells Made by Using High Rotation Shearing Mixer
    Natsuro Hobara, Akifusa Hagiwara, Akira Kondo, Hiroya Abe, Makio Naito
    2012 Volume 49 Issue 8 Pages 594-598
    Published: August 10, 2012
    Released on J-STAGE: August 11, 2012
    DOIhttps://doi.org/10.4164/sptj.49.594
    JOURNAL FREE ACCESS
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    The effect of processing conditions of high rotation shearing mixer on the properties of composite cathode materials of SOFC was investigated. Morphology, BET specific surface area and particle size were evaluated for the processed composite powders. The electrochemical properties and microstructure of the cathode electrode made by the composite powders were also evaluated. As a result, smaller bulk resistance and interfacial resistance were obtained than those of cathodes made by simple mixing. Both resistances were smaller as BET specific surface area of the processed powder became smaller. It was discussed that smaller BET surface area led to better organized network structure in the cathode. However, the shearing mixer used in this paper was less effective for obtaining smaller BET surface area of composite powders compared to that made by vertical axis shearing mixer already reported by the authors.
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  • Solid / Liquid Interfacial Structures, Surface Forces, and Rheology of Colloidal Dispersions Comprised of Silica Particles Suspended in Liquid Epoxy Resins
    Kazuya Fujisaki, Yuki Matsuoka, Ken Oota, Tomonori Fukasawa, Hiroyuki ...
    2012 Volume 49 Issue 8 Pages 599-607
    Published: August 10, 2012
    Released on J-STAGE: August 11, 2012
    DOIhttps://doi.org/10.4164/sptj.49.599
    JOURNAL FREE ACCESS
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    In the present study, we have investigated the liquid resin composite consisted of an epoxy resin, an epoxy resin curing agent, a filler of silica particles, and a particle surface modifier of silane coupling agent at different temperatures, using atomic force microscopy and rheometry. Particular focus is on the mechanism how interaction forces between the silica surfaces and rheological properties of the liquid resin composite are affected by the silane coupling agent and the temperature. The relationship between the interparticle force and the particulate suspension rheology was discussed at a molecular level.
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  • Design of Porous Microparticles by Spray Freeze-drying (SFD) Technique and Effect of Particle Density on Dry Powder Inhalation Behaviors
    Toshiyuki Niwa, Daisuke Mizutani, Kazum Danjo
    2012 Volume 49 Issue 8 Pages 608-613
    Published: August 10, 2012
    Released on J-STAGE: August 11, 2012
    DOIhttps://doi.org/10.4164/sptj.49.608
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    The highly porous and lightweight microparticles were prepared by a novel spray freeze-drying technique (SFD) for applying dry powder inhalation (DPI). The aqueous latex dispersion of methacrylic acid - ethyl acrylate copolymer was used as a matrix former to obtain the porous but rigid spherical structure. Several types of SFD particles with preset particle density ranging in 0.04 to 0.15 g / cm3 could be successfully prepared by changing the solid concentration in the spray suspension. The methodology to measure the particle density accurately was newly established by using pseudo-SFD particles with mm-order in size. The SFD particles with around 10μm in geometric mean diameter exhibited the excellent in vitro aerosol performance due to their low density. The particles with around 0.11 g / cm3 of density had the highest fine particle fraction, which was defined as percentage less than 4.7μm in aerodynamic cut-off diameter. It was also suggested that the improvement of aerosol performance was attributed to cohesive behavior between particles in airflow.
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Review
  • Submicrometer Spherical Particle Fabrication by Pulsed Laser Melting in Liquid －Boron Carbide Submicrometer Spherical Particle Case－
    Yoshie Ishikawa, Naoto Koshizaki
    2012 Volume 49 Issue 8 Pages 614-621
    Published: August 10, 2012
    Released on J-STAGE: June 18, 2015
    DOIhttps://doi.org/10.4164/sptj.49.614
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    We have developed a new fabrication technique for submicrometer spherical particles by pulsed laser melting in liquid. In this technique, nanosecond pulsed laser irradiation at relatively low fluence to nanoparticles dispersed in liquid induces particle melting to form droplets, resulting in spherical particle formation by quenching. Here we demonstrate an example of boron carbide spherical particle fabrication by this method, investigate the effect of processing parameters, and discuss the formation mechanism through the simple particle heating/melting model, which is completely different from the mechanism in the conventional pulsed laser ablation in liquid. This process can also be applied for submicrometer spherical particles of various materials, such as metals, oxides, and semiconductors.
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