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Volume 49, Issue 12
Special Issue of 2012 Spring Annual Meeting
Displaying 1-5 of 5 articles from this issue
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Original Paper
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Sayaka Omori, Motoyuki Iijima, Keisuke Hirano, Hidehiro Kamiya2012 Volume 49 Issue 12 Pages 876-882
Published: December 10, 2012
Released on J-STAGE: December 27, 2012
JOURNAL FREE ACCESSThe effects of SiO2 nanoparticle concentration on the mechanical properties of SiO2/silicone nanocomposite sheets prepared from reactive silicone oligomers with methyl- and methoxy- side groups were investigated. It was shown that a transparent and rollable silicone sheet can be prepared at all tested condition where SiO2 concentration was 4.2-8.1 vol%. While a silicone sheet with a tensile strength of 10.3 MPa and Weibul modulus of 6.01 was prepared when the concentration of SiO2 was 6.6%, the tensile strength and Weibul modulus have reduced to 8.23 MPa and 1.63, respectively, when the SiO2 nanoparticle concentration has reduced to 4.2%. It was also shown that the contact angle of the sheet reduced as the SiO2 concentration in the silicone sheet increases. The changes of these macroscopic properties of the SiO2/silicone sheet which were induced by the difference of SiO2 loading content were discussed with the changes of surface structures of SiO2 nanoparticles.View full abstractDownload PDF (965K) -
Aya Oyama, Jumpei Miyazaki, Hayato Tokumoto, Yasuhiro Konishi, Toshiyu ...2012 Volume 49 Issue 12 Pages 883-888
Published: December 10, 2012
Released on J-STAGE: December 27, 2012
JOURNAL FREE ACCESSThe purpose of our research is to design a composite biofilm with nitrifying bacteria and denitrifying bacteria that imitate a biofilm in the nature. As a first step, a biofilm formation of denitrifying bacteria on a support material was examined from the viewpoint of fine particle technology. As a result, it was found that the area fraction of denitrifying bacteria adhered on the support material was related to the change in energy of interaction between denitrifying bacteria and support material, ΔG, which was calculated from their surface tensions. Furthermore, the pattern of biofilm formation was found to be depended on ΔG. These results indicate that ΔG can be treated as an indicator of biofilm formation.View full abstractDownload PDF (771K) -
Takayuki Kamiya, Hisami Kondo, Hiroyuki Hiroma, Shuuhei Nakajima, Mits ...2012 Volume 49 Issue 12 Pages 889-895
Published: December 10, 2012
Released on J-STAGE: December 27, 2012
JOURNAL FREE ACCESSIn-line lubrication (external lubrication) has been reported as a new approach to prevent problems in the compression process, such as sticking, picking, lamination, and capping, in pharmaceutical industries. The main advantages of using in-line lubrication are that it completely prevents sticking problems, and avoids the negative effects of tablet properties (decreasing tensile strength, delaying of dissolution). In this study, we investigated the functions of a newly developed in-line lubrication system (Extalub, Hata Iron Works, Kyoto, Japan). This system is unique in the mechanism by which it generates the lubricant/air mixture, and in the intermittent spraying that synchronizes with the rotary table. Our results showed that important parameters in controlling the concentration of magnesium stearate with this system are the spraying rate of lubricant, rotation speed of the rotary press, and air volume of the dust collector. Furthermore, a long compression run showed that the spraying rate of lubricant and concentration of magnesium stearate in the tablets remain stable throughout the process.View full abstractDownload PDF (1304K) -
Chika Takai, Masayoshi Fuji, Kyoichi Fujimoto2012 Volume 49 Issue 12 Pages 896-900
Published: December 10, 2012
Released on J-STAGE: December 27, 2012
JOURNAL FREE ACCESSTo maintain the temperature of heated or cooled air inside a room, we need to put thermal insulation on the transparent glass windows where heat most frequently comes and goes. Fibrous materials and gas-foamed plastics provide some insulation due to the low thermal conductivity of air but are not transparent. Here we show that a transparent nano-spaced polymer film consisting of hollow silica nanoparticles (HSNPs) dispersed in a polyurethane (PU) matrix provides good thermal insulation. The largest advantage of the thermal insulation film using HSNPs is the combination of transparency, flexibility and low thermal conductivity, which is caused by a quasi-vacuum state in the nano-space. The state is formed when the size of the space is close to the length of the mean free path of the air molecules in the space. Heat tends to be transferred along the silica shells of HSNPs instead of through other materials in the film. Dispersed HSNP flocculation in the film is the key to both transparency and good thermal insulation.View full abstractDownload PDF (569K) -
Mayuko Okabe, Hiroshi Okadome, Koh-ichi Yoza, Junko Matsuki, Tomoya Ok ...2012 Volume 49 Issue 12 Pages 901-906
Published: December 10, 2012
Released on J-STAGE: December 27, 2012
JOURNAL FREE ACCESSThis study aimed to specify the production method of rice flour with a relatively larger particle size that promotes favorable bread swell. Therefore, we examined the effect of the particle size distribution on the bread-making quality, and clarified the optimal distribution of the particle size of rice flour that complements bread using each pulverization method and the powder property. Rice flour made using the Cyclone sample mill and Pin mill both made the largest volume of bread at about 210μm particle size. We reconstituted the rice flours using sieved fractions so that they had the same mean particle size but a different distribution range from the original rice flour. Changes of the distribution range led to changes in rice flour characteristics, such as powder properties and damaged starch content, however, bread volume was not affected by these changes.View full abstractDownload PDF (627K)
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