| Project/Area Number |
12450268
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Kyoto University |
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Principal Investigator |
NAKANISHI Kazuki KYOTO UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, ASSOCIATE PROFESSOR, 工学研究科, 助教授 (00188989)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Koji KYOTO UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, RESEARCH ASSOCIATE, 工学研究科, 助手 (50314240)
JINNAI Hiroshi KYOTO INSTITUTE OF TECHNOLOGY, DEPARTMENT OF POLYMER SCICENCE AND ENGINEERING, LECTURER, 繊維学部, 講師 (20303935)
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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 |
¥12,400,000 (Direct Cost: ¥12,400,000)
Fiscal Year 2001: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 2000: ¥7,500,000 (Direct Cost: ¥7,500,000)
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| Keywords | confined space / sol-gel method / phase separation / porous structure / chromatography / organic-inorganic hybrid / wetting / silica |
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| Research Abstract |
Macroporous gel samples in the systems of silica or siloxane-based organic-inorganic hybrid were synthesized in small confined spaces of slab, thin columnar and short columnar shapes. In the slab shaped confined spaces with the thickness up to 30 microns, the characteristic size of phase separation frozen in the gel structure became coarser with a decrease in the thickness of the confined space both in silica or hybrid systems. On hydrophobized container walls, the formation of skin layer was observed in the case of hybrid composition, which was accompanied by the depletion layer and columnar phase separated domains in the vicinity of the container walls. Detailed analysis of these structures by 3-D observation with laser scanning con focal microscopy revealed that the phase separation was affected by the presence of walls that cause surface-spinodal wave. As a result of superposition of the co-continuous domain structure and the layer-like surface-induced structure, the depletion layer and the columnar deformed domains were formed. On the other hand, on hydrophilized container walls, the gel domains were chemically bonded without forming the skin layer. Depletion layers and columnar deformed domains similar to the case of hydrophobized walls were observed. However, in this case, the depletion layers were formed as a result of compromise between repulsive interaction between gel domains and walls and chemical anchoring of the domains on the silanol-containing walls. Unique very fine phase separated structures were observed when the confined space was in the same dimension as the size of phase separated domains.
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