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 2
Displaying 1-8 of 8 articles from this issue
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  • Preparation and Function of Composite Material Arrayed Mesoporous Silica Microsphere on Titania Film
    Yoshikazu Miyake, Hironori Takemoto, Soshi Esaki, Takayoshi Yasui, Tos ...
    2008 Volume 45 Issue 2 Pages 90-97
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.90
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    The mesoporous silica microspheres were prepared in EtOH-H2O solution by using dodecyl amine functioned as molecular template and catalyst. The mesoporous silica microspheres were arrayed on the titania film, which was prepared by a spin-coating method of W/O microemulsions containing titania-tetraisopropoxide as a titania source. When the ethanol was used as the dispersion medium, the single array of mesoporous silica microspheres was obtained on the titania film by a dip-coating method, but in the case of water, the multiple array was obtained on the titania film. The irradiation effect of black-light on the array states during the dip-coating processes was hardly observed, but the super-hydrophilic effect was observed for the spread of silica particles dispersed in water on the titania film. Next, the mesoporous silica microsphere adsorbed rhodamine B was also arrayed on the titania film by dip-coating. The adsorbed rhodamine B was photocatalytically degradated by the irradiation of black light. The degradation rate of rhodamine B for the multiple arrays was faster than that for single array.
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  • Fabrication of Monolayer Particle Arrays by Continuous Coating Process
    Daisuke Nonaka, Fumio Yamamoto, Ryosuke Kimura, Katsumi Tsuchiya, Mako ...
    2008 Volume 45 Issue 2 Pages 98-103
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.98
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    Two or three-dimensional arrays of particles are expected as the structure having novel functions such as light-emitting diodes, solar batteries, and photonic crystals. But the fabrication method of particle array having a large area with high regularity is under development. The objective of this study is to develop the continuous coating process for large area fabrication of the monolayer particle array by convective self assembly (CSA). The formation rate of particle array increased with the flow rate of the feed colloidal suspension, and its regularity became higher than that using the batch type method of CSA. The defects in the particle array prepared by CSA were able to be categorized through point and line defects. The number of point defect in particle array decreased when using the continuous coating process, or the colloid suspension mixed with small particles, or the mechanical vibration in colloid suspension during coating process. On the other hand, the number of line defect in particle array was not changed by these operation conditions.
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  • An Investigation of Evaluation Function for the Method to Determine the Optimum Refractive Index Parameter in Laser Diffraction and Scattering Method
    Takeshi Kinoshita
    2008 Volume 45 Issue 2 Pages 104-109
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.104
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    This paper proposes a method for the determination of optimum refractive index parameter in laser diffraction method.
    The cosine of cross-angle θ between “detected light distribution vector” and “estimated light distribution vector” is used as an evaluation function to determine the optimum refractive index parameter as reported previously. Thus-deteremined refractive index parameter is found to be adopted as the optimum refractive index when the value of the cosine of cross-angle θ is close to unity.
    In this paper, a weight matrix is used when the cosine of cross-angle θ is calculated. It is introduced because it can clearly discriminate the optimum refractive index parameter from others. The effectiveness of the weight matrix, as well as a modified Gaussian function, is confirmed through the experiments with several sample powders.
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  • Effects of Manufacturing Process on the Surface States of α-Al2O3 Powder and its Hydration Behavior
    Takashi Shirai
    2008 Volume 45 Issue 2 Pages 110-115
    Published: February 10, 2008
    Released on J-STAGE: January 24, 2011
    DOIhttps://doi.org/10.4164/sptj.45.110
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    In the case of high purity α-Al2O3 powder, the surface may contain an aluminum hydroxide phase, which may bring differences in surface property of α-Al2O3 powders. The aluminum hydroxide phase present on the surface sometimes leads to porous structure in sintered bodies. Therefore, the investigation for hydration ability of powder surfaces is very important for ceramic manufacture. In this paper, the effects of manufacturing process of commercial high purity α-Al2O3 powders on their surface characteristics are discussed.
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  • Doctoral Thesis Introduction
    2008 Volume 45 Issue 2 Pages 116-117
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.116
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  • Overseas Report
    2008 Volume 45 Issue 2 Pages 118-121
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.118
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  • Autumn Annual Meeting and Symposium 2007 in Osaka
    Hidehiro Kamiya, Yoshio Otani
    2008 Volume 45 Issue 2 Pages 122-123
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.122
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  • Report of Tohoku Branch
    Mitsuru Nikaido
    2008 Volume 45 Issue 2 Pages 124
    Published: February 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.124
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