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Volume 40, Issue 3
Displaying 1-11 of 11 articles from this issue
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Makio Naito2003 Volume 40 Issue 3 Pages 149
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
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Yuichi Yonemochi, Mitsumasa Kimata, Koichi Yoshimoto, Masahiro Hasegaw ...2003 Volume 40 Issue 3 Pages 150-156
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the preparation of monodisperse hematite particles with the diameter larger than 3μm using a single batch gel-sol method in the liquid phase. Heat generated by the exothermic reaction of hematite particle formation is removed by the cooling of the reactor. Lowering the reactor temperature reduces the number of nuclei which in turn increase the particle size. When the temperature of the reactor is at 25°C, the maximum particle size of monodisperse pseudocubic hematite particles prepared by the present method is about 5.6μm in mean diameter. However, at 15°C when the reactor overquenches, polydisperse particles are formed because the nucleation of hematite particles takes place during the growth process of hematite particles. In the case of peanut-type particles synthesized by the addition of sulfate ions during the reaction, it is possible to increase particle diameter by using a similar cooling technique. The maximum particle size was about 3.4μm in mean diameter at 20°C. The cooling of reactor during the nucleation process also varies the aspect ratio of peanut-type particles.View full abstractDownload PDF (4719K) -
Hirofumi Takeuchi, Shinsuke Nagira, Hiromitsu Yamamoto, Yoshiaki Kawas ...2003 Volume 40 Issue 3 Pages 157-162
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSolid dispersion particles were prepared with indomethacin and fine porous carriers having different pore sizes (Sylysia350, Sylysia740) by use of spray-drying technique. The particles were in the size range of 3-6μm, which is equal to that of the original carrier particles. The indomethacin in solid dispersions was in amorphous state regardless of the type of silica. Specific surface area measurement and DSC analysis of the solid dispersion particles suggested that the difference in pore size of these carrier particles leads to the different drug dispersion of the resultant solid dispersion particles. The drug dissolution properties of solid dispersions were improved compared with crystalline indometacin of γ-form. Solubility of drug formulated into solid dispersions was higher than that of crystalline indomethacin, indicating that the amorphous indomethacin kept its higher energy state in the porous carriers.View full abstractDownload PDF (2126K) -
Hiroya Abe, Kenji Okamoto, Tadashi Hotta, Makio Naito, Keizo Uematsu2003 Volume 40 Issue 3 Pages 163-168
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSPacking structure of particles was analyzed in detail for alumina green body made by tape casting method. Alumina particles of elongated shape were aligned with their long axis parallel to the tape casting direction. The overall particle packing structure was consistent with what was expected from the slurry flow under a blade. The orientation is developed by the shear stress between a carrier tape and the blade. The sintering of green body caused significant shrinkage in the thickness direction, which was mainly due to the particle packing structure.View full abstractDownload PDF (6757K) -
Masayoshi Fuji, Yoshihiro Shiroki, Minoru Takahashi, Hisao Suzuki, Sei ...2003 Volume 40 Issue 3 Pages 169-176
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSPorous ceramics with a high heat and corrosion resistance and high gas permeability have been fabricated for high temperature dust collection. Cordierite, which has a high thermal shock resistance due to a low expansion coefficient, was used as a filter matrix. The porous filter was produced by in situ solidification of slurry containing bubbles. Zircon was coated on the porous cordierite by using the solgel process to improve the corrosion resistance at high temperatures. The coating was carried out by dipcoating technique. Various structures of coating layer were obtained by controlling coating conditions, such as the coating rate, the solution viscosity, and the coating times. The formation of particle layer on the outer surface of filter was of the best structure for high temperature dust collection filter because it enhanced temperature corrosion resistance without reducing gas permeability.View full abstractDownload PDF (8199K) -
Takashi Ida, Hideo Toraya2003 Volume 40 Issue 3 Pages 177-184
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
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Hirofumi Takeuchi2003 Volume 40 Issue 3 Pages 185-191
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
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Aerosol Deposition for Forming of Nanocrystal Layer and Powder TechnologyJun Akedo, Masakatsu Kiyohara2003 Volume 40 Issue 3 Pages 192-200
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
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[in Japanese]2003 Volume 40 Issue 3 Pages 201-205
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
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2003 Volume 40 Issue 3 Pages 206
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (134K) -
2003 Volume 40 Issue 3 Pages 207-208
Published: March 10, 2003
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (314K)
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