| Project/Area Number |
14350356
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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 | Waseda University |
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Principal Investigator |
KURODA Kazuyuki Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (90130872)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOJIMA Atsushi Waseda University, JSPS Fellow, 特別研究員
SUGAHARA Yoshiyuki Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (50196698)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 2003: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 2002: ¥9,100,000 (Direct Cost: ¥9,100,000)
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| Keywords | Inorganic-Organic Hybrid / Organoalkoxysilane / Sol-Gel Method / Porous Silica / Self-Assembly |
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| Research Abstract |
Structural control of silica-based hybrids derived from organoalkoxysilanes is a subject of great importance. We developed a new approach to create mesostructured silica-based hybrids by using newly designed siloxane oligomers (C_nH_<2n+1>Si(OSi(OMe)_3)_3, n=8-18) as single precursors. Either well-ordered lamellar phase or slightly distorted 2D hexagonal phase was obtained depending on the alkyl chain lengths in the precursor. The hybrids with a hexagonal structure can be converted to meso-or micro-porous silica upon calcination to remove organic groups, which is the first example of the synthesis of hexagonally ordered porous silica without the use of surfactants as template.
We also reported the synthesis of novel layered silica-organic nanostructured materials, consisting of bimolecular layers of long-chain alcohols and thin silica layers, from alkoxytrichlorosilanes (n-C_nH_<2n+1>OSiCl_3, n=12-20). The formation relies on the self-assembly of alkoxysilanetriols (n-C_nH_<2n+1>OSi(OH)_3) generated by the preferential hydrolysis of Si-Cl groups in the precursors. Polycondensation of alkoxysilanetriols was found to proceed in the solid state to form silica networks, being accompanied by the cleavage of the alkoxy groups.
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