| Project/Area Number |
12650748
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | Niigata University |
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Principal Investigator |
KIMURA Isao Graduate School of Science and Technology, Niigata University, Associate Professor, 大学院・自然科学研究科, 助教授 (00169921)
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| Co-Investigator(Kenkyū-buntansha) |
TANIGUCHI Masayuki Graduate School of Science and Technology, Niigata University, Associate Professor, 工学部, 教授 (00163634)
TANAKA Masato Faculty of Engineering, Niigata University, Professor, 工学部, 教授 (40018495)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | sol-gel process / silver chloride / silica / tetraethoxysilane / suspension / microcapsule / colon bacillus / antimicrobial material / ゾルーゲル法 / 銀スルファト錯体 / 構造制御 / 逆相懸濁系 |
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| Research Abstract |
When silver thiosulfato complex was used as antimicrobial material, dispersing-type microcapsule was not obtained because of the segregation of the complex onto the capsule surface. The complex content inside the microcapsule was somewhat improved by using dispersion stabilizer. However, the complex was released very fast, when the microcapsules were suspended in water. It was found that they were not suitable for the use as antimicrobial materials to be served for a long term.
Thus, fine AgCl particles were used instead of silver thiosulfato complex. Polyvinylalcohol (PVA) of a nonionic surfactant was the most effective as a dispersion stabilizer, resulting in microcapsule in which AgCl was uniformly dispersed. The Use of anionic or cationic surfactant did not form stable dispersion. The AgCl content of the microcapsule and the amount of AgCl released to water increased with the increase in the dispersion stabilizer concentration. The release rate decreased with the dispersion stabilizer concentration to about 6% for 48 h.
These microcapsules were changed to gray in color during the ordinary handling. This is due to decomposition of AgCl by UV irradiation. By hybridizing the microcapsules with titania from TTIP, they were kept white in color. This is suggested that titania is effective for shielding from UV irradiation and hiding the inside of the microcapsule. The addition of TTIP of 20 - 50 mol/m^3 to the continuous phase resulted in good composites.
The antimicrobial effect of the microcapsule was confirmed by cultivating a colon bacillus (Escherichia coli) in suspension of the microcapsules.
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