| Project/Area Number |
07555551
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
反応・分離工学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
MASUOKA Hirokatsu Hiroshima University, Faculty of Engineering, Professor, 工学部, 教授 (50034385)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOYAMA Masaru Matsushita Electric Works, Ltd, Central Research Laboratory, Chief Engineer, 中央研究所, 主幹技師
SATO Yoshiyuki Hiroshima University, Faculty of Engineering, Assistant Professor, 工学部, 助手 (50243598)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Supercritical Drying / Drying / Silica Aerogel / Porous Material |
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| Research Abstract |
Drying of silica alcogels using supercritical carbon dioxide was carried out at various conditions to investigate the optimal drying conditions for samples with different sizes. From the experiments it was found that a non-equilibrium interface that appeared in fluid phase in some gels, while the tem perature had a minor influence on the time. An increase in the sample thickness affected all stages of the drying process seriously, resulting in longer drying times. Hydrophobic modification of silanol groups on the gels was also performed in the middle of the supercritical drying process using three methylmethoxysilanes. The effects of the hydrophobic modification were evaluated by measuring water adsorption. The aerogel samples modified with methyltrimethoxysilane in the supercritical fluid phase showed higher hydrophobictiy than those modified in the liquid phase prior to the supercritical drying process.
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