| Project/Area Number |
12450311
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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 |
化学工学一般
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| Research Institution | Osaka University |
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Principal Investigator |
KOMASAWA Isao Osaka University, Graduate School of Engineering Science, Professor, 基礎工学研究科, 教授 (40029476)
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| Co-Investigator(Kenkyū-buntansha) |
SHIRAISHI Yasuhiro Osaka University, Research Center for Solar Energy Chemistry, Assistant Professor, 太陽エネルギー化学研究センター, 助手 (70343259)
HIRAI Takayuki Osaka University, Research Center for Solar Energy Chemistry, Professor, 太陽エネルギー化学研究センター, 教授 (80208800)
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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 |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Nanoparticles / Reverse Micelles / Quantum size effect / Photocatalysts / Composite Materials / Photochemical reaction / Hydrogen production / Mesoporous silica |
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| Research Abstract |
There has been much interest recently in the preparation and processing of nanoparticles, owing to their size-dependent photophysical and photochemical properties, such as quantum-size effect. In this research project, the preparation of novel functional materials such as photocatalysts, based on the processing technology of semiconductor nanoparticles has been investigated.
1. Direct Recovery and Immobilization of CdS and RuS_2 Nanoparticles from Reverse Micelles onto Thiol-Modified Polvstylene and Alumina Particles. CdS nanoprticles prepared in reverse micellar solution were recovered and immobilized onto miol-modified polystylene and thiol-modified alumina particles, via simple addition of the supports and mild stirring. The resulting composites could be utilized as photocatalysts, and the photocatalytic properties were controlled precisely by controlling the nanoparticle size. RuS_2 nanoparticles were also prepared in reverse micellar solution and immobilized onto thiol-modified polystyrene particles.
2. Size-Selective Incorporation of CdS Nanoparticles into Mesoporous Silica. CdS nanoparticles prepared in reverse micellar systems were incorporated into thiol-modified MCM-41 (FM41) mesoporous material, of differing pore sizes, designated as large (L-FM41), middle (M-FM41), and small (S-FM41). A particle-sieving effect of the FM41 was observed, in that the incorporation of the CdS nanoparticles was decreased by increased size of particle, and by a decreasing pore size of the FM41. The resulting CdS-FM41 composite showed photocatalytic activity for hydrogen generation from water.
3. Composite Photocatalysts based on Nanocomposites of Semiconductors. The CdS nanoparticles were immobilized on Ti0_2 particles or thiol-modified Zn-doped Si0_2 particles. The photoexcited electrons generated in one semiconductor were well separated into the other semiconductor, and high performance photocatalytic hydrogen generation was observed.
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