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 46, Issue 7
Displaying 1-4 of 4 articles from this issue
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  • Microstructure and Surface Behavior of Oxide and Composite Nanoparticles Prepared by Flash Creation Method
    Kenji Takebayashi, Akira Watanabe, Motoharu Fujii, Shuji Sasabe, Takeh ...
    2009 Volume 46 Issue 7 Pages 520-525
    Published: July 10, 2009
    Released on J-STAGE: January 25, 2010
    DOIhttps://doi.org/10.4164/sptj.46.520
    JOURNAL FREE ACCESS
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    Dispersion behavior of nanoparticles in organic solvent depends on surface molecular structure, even if the material and size of particles are same. In order to discuss the effect of surface conditions of nanoparticles on dispersion behavior in organic solvent and surface modification behavior, single phase SiO2 and TiO2 nanoparticles and SiO2-TiO2 composite particles were prepared by using flash creation method (FC method) with different thermal source, DC plasma or burner. By the observation of TiO2-SiO2 composite particles by TEM-EDS system, the microstructure of composite particles was estimated that SiO2 layer coated on core TiO2 nanoparticles. Surface OH group structure, dispersion behavior in N-methyl-2-pyrrolidone (NMP) of each TiO2 nanoparticles was depended on the thermal source of FC method. When thermal source used was burner, the high OH group density and well dispersion behavior was observed. However, after surface modification by silane coupling agent, the aggregate size of TiO2 nanoparticles prepared by DC plasma in NMP was decreased.
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  • Study on Decomposition Mechanism of Rhodamine B with Photocatalytic Composite Particles
    Takanori Aono, Yukiko Ikeda, Yasuhiro Yoshimura, Yoshishige Endoh
    2009 Volume 46 Issue 7 Pages 526-531
    Published: July 10, 2009
    Released on J-STAGE: January 25, 2010
    DOIhttps://doi.org/10.4164/sptj.46.526
    JOURNAL FREE ACCESS
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    Photocatalysts cleaning dishwater have been studied to high performance. A fluid bed for cleaning dishwater is efficient to contact between photocatalytic particles and dishwater. However, submicron photocatalytic particles are difficult to collect and recover in the fluid bed. This paper presents photocatalytic composite particles in the fluid bed for cleaning dishwater. The developed photocatalytic composite particles consist of floating resin particles covered with photocatalytic particles (TiO2). The efficiency of the photocatalytic composite particles is occurred with an examination of concentration changes in organic dye (Rhodamine B) solution. As a result, after 90min the concentration of Rhodamine B is decreased to 10%. The reaction of Rhodamine B molecules was 2 steps reactions. 1st step was absorption on a surface of metal on photocatalytic particles, and 2nd step was displacement reaction by photocatalysis. Consequently, Rhodamine B molecules were reacted to Florescein molecules by the photocatalytic composite particles.
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Review
  • Role of Pore Defect and its Control in Sintered Ceramics
    Masataro Okumiya, Hiroya Abe, Makio Naito
    2009 Volume 46 Issue 7 Pages 532-540
    Published: July 10, 2009
    Released on J-STAGE: February 08, 2019
    DOIhttps://doi.org/10.4164/sptj.46.532
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    This paper reviews the importance of pore defect in sintered ceramics which affects the mechanical property. The relationship between fracture strength and microstructure is discussed to demonstrate that the pore defect serves as the fracture origins which reduces the fracture strength of ceramics.
    Manufacturing process of alumina ceramics through powder granule compaction is introduced in order to explain how the slurry property influences the granule properties, leading to the pore defect structure in final sintered bodies which determines the strength distribution of ceramics.

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Review : Frontier Research Series
  • Heat Transfer Enhancement Using Carbon Fibers in Packed Bed Reactor
    Koich Nakaso
    2009 Volume 46 Issue 7 Pages 541-545
    Published: July 10, 2009
    Released on J-STAGE: February 08, 2019
    DOIhttps://doi.org/10.4164/sptj.46.541
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    Packed bed reactors are commonly employed for a general catalyst reactor, chemical heat pumps etc. However, the low effective thermal conductivities of packed bed reactors often lead to low performances. In this paper, heat transfer enhancement in packed bed reactor is investigated numerically and experimentally. As a promoter of thermal conduction, a brush made of carbon fiber with high thermal conductivity is introduced in the packed bed. As a result, the carbon fiber brush effectively transferred reaction heat and promote the reaction. Therefore, it is one of the strong candidates of thermal promoter in the packed bed reactors.

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