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 45, Issue 5
Displaying 1-10 of 10 articles from this issue
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  • The Way to Control Particles Motion by Electric Fields
    Yoshiyuki Shirakawa
    2008 Volume 45 Issue 5 Pages 289
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.289
    JOURNAL FREE ACCESS
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  • Feasibility Study on Particle Flowability Evaluation in Simplified MOX Pellet Fabrication Process Using Vibrating Tube Method
    Katsunori Ishii, Masahiro Suzuki, Takuma Yamamoto, Yoshiyuki Kihara, M ...
    2008 Volume 45 Issue 5 Pages 290-296
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.290
    JOURNAL FREE ACCESS
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    Particle flowability test using a vibrating tube with a tapered end was carried out to evaluate the applicability of this method to the analysis of MOX particles for nuclear fuel pellet fabrication. In this experiment, zirconia particles were used as model particles, which are smaller than several hundred micrometers in diameter. The sample particles were prepared by mixing the particles with different sizes, whose shape and surface state were changed by a mechanical treatment. The experimental results showed that the removal of smaller particles is more effective than the mechanical surface treatment in improving the flowability. Furthermore, it was found that the vibrating tube method can identify the difference in the particle flowability more easily and clearly than the method based on Carr's flowability index.
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  • Effect of Pulsed Air Jet on the Air Jet Removal of Adhered Single Particles
    Mineya Okazaki, Mikio Yoshida, Jun Oshitani, Kuniaki Gotoh
    2008 Volume 45 Issue 5 Pages 297-304
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.297
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    Removal of single particles adhered on a flat plate by a pulsed air jet has been investigated experimentally. In this study, we aimed at elucidating the factors that affect the improvement of the removal by pulsed air jet.
    Experimental results showed that the improvement of removal by pulsed air appears only when the nozzle pressure is higher than the critical pressure at which the air jet velocity through the nozzle reaches the sonic velocity. When the nozzle pressure is set at above the critical pressure, the improvement has the maximum at a certain pulse frequency (i. e., there exists an optimum frequency). Measurement of the air pressure on the flat plate surface revealed that the air pressure never falls to zero at a frequency higher than the optimum frequency. On the other hand, it was found in the frequency range lower than the optimum frequency that the improvement of the removal increases with a decrease in the interval time of the pulse. Thus, the optimum frequency is the frequency that has the shortest interval time for reaching each pulsed air jet to the surface as an independent air jet.
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  • Phase Transition and Morphology of NaCl Aerosol Particles
    Toshiyuki Nomura, Motohiro Kurosaki, Aiko Sakashita, Taiki Nishimoto, ...
    2008 Volume 45 Issue 5 Pages 305-311
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.305
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    The effects of relative humidity on the water content and the morphology of NaCl aerosol were investigated by infrared spectroscopy. NaCl droplets with the median diameter 0.35μm were prepared by atomizing 26.69g/l of aqueous NaCl solution at ambient condition. Two types of experiment under controlled relative humidity were carried out. One is humidification of dried aerosols containing dry NaCl particles, and the other is dehumidification of wet aerosols containing saline droplets. At a humidity above the deliquescence point during humidification of dry aerosols as well as above the crystallization point during the dehumidification of wet aerosols, NaCl aerosols containing aqueous droplets followed the hygroscopic growth curve. At a humidity below these phase transition points, NaCl aerosols were composed of the polycrystalline particles together with saline water. These results suggest that the morphology of salt aerosols may vary with the history of their surrounding conditions.
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  • Two-Dimensional Colloidal Crystals
    Sachiko Matsushita
    2008 Volume 45 Issue 5 Pages 312-318
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.312
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    The self-assembly preparation methods and application of two-dimensional colloidal crystals, in which fine spherical particles (15nm-20μm) are two-dimensionally periodically ordered on solid substrates, are reviewed. Among the preparation methods, evaporation-driven self-assembly, electrophoretic deposition, ink-jet printing, lift-up soft lithography are reveiwed. As examples of the applications, antireflection films, micro-lens arrays, a model of photonic crystals, and masks for lithography are introduced.
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  • Heat and Heterogeneous Chemical Reactions Through the Pyrolysis of Woody Biomass
    Ken-ichiro Tanoue
    2008 Volume 45 Issue 5 Pages 319-324
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.319
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    Pyrolysis process of woody biomass was modeled by adopting two-step ractions, that is, the parallel reactions producing gases, tar and char from the biomass, and the subsequent reactions generating gases and char from the tar. The pyrolysis experiments of woody biomass for the particles with a mean diameter between 1.1mm and 11mm showed that the change of average temperature in the biomass layer with time can be divided into four regions. Generated gas flow rate exhibited two peaks when the heat flow rate was in endothermic regions. Therefore, the heterogeneous chemical reactions through the pyrolysis should be modeled by four-step processes; i. e., i) evaporation of water, ii) decomposition of cellulose, iii) decomposition of generated tar and iv) decomposition of generated char. Among them, the decomposition of cellulose, which generates tar and char, are strongly affected by the water contents of biomass.
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  • Doctoral Thesis Introduction
    2008 Volume 45 Issue 5 Pages 335-336
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.335
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  • Report of the 43rd Meeting of the German Colloid Society
    Syuji Fujii
    2008 Volume 45 Issue 5 Pages 337-338
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.337
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  • Report of “24th Symposium on Particulate Preparations and Designs”
    Tadatsugu Tanino
    2008 Volume 45 Issue 5 Pages 339
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.339
    JOURNAL FREE ACCESS
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  • Activity Report of Hokkaido Branch, 2005-2006
    Yoshihisa Kuga
    2008 Volume 45 Issue 5 Pages 340
    Published: May 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.340
    JOURNAL FREE ACCESS
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