| Project/Area Number |
08650968
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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 |
工業物理化学
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| Research Institution | Tokyo University of Mercantile Marine (1997)
The University of Tokyo (1996) |
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Principal Investigator |
BABA Ryo Tokyo Univ.of Mercantile Marine, Marine System Engineering ; Associate Professor, 商船学部, 助教授 (70198951)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Surface / Optical constants / Photoinduced surface reaction / Optical micromapping / Photocatalysis / Microelectrode / Self-sustained oscillation / Spatiotemporal pattern / マッピング法 / 光ヘテロダイン法 / 表面拡散 |
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| Research Abstract |
The present research project was aimed, by both theoretical and experimental approaches, at the development of a high resolution optical heterodyne micromapping of the surface optical constants at the photocatalyst thin films. Those major issues studied and the results obtained are as follows :
1) Basic study for the development of the optical heterodyne micromapping system.
In order to establish a micromapping of the surface optical constants based on the optical heterodyne method, a scanning system of a probe laser beam using an AO modulator and the electronics detecting the optical beat signal were setupped and their fundamental characteristics were studied. The results were compared with those obtained by the holographic method described below.
2) In situ observation of the surface processes at thin-film TiO2 photocatalyst
Holographic grating method was undertaken in order to study the photoinduced surface processes as modeled at a TiO2 thin-film photocatalyst under the interfering uv-
… More
illumination. It was suggested that the microscopic distribution of reactants and/or reaction intermediates upon photocatalysis can be probed in terms of the corresponding spacial modulation of the surface refractive index. Based on the experimental results those characteristic parameters for the surface processes such as kinetics and the surface mass transfer coefficient were suggested to be estimated.
3) Spatiotemporal propagation of non-linear electrochemical Reaction over iron electrode
Non-linear electrochemical oscillation of iron electrode was studied in terms of the test surface reaction accompanying the change in surface optical constants. The time dependent potential propagation into an electrolyte solution and spatiotemporal pattern formation on iron electrode were measured. Concerning the reaction scheme, when the resistance was inserted in series between the potentiostat and the iron electrode, the spatiotemporal pattern of the oxide reduction varied as well as the pulse shape of the current oscillation. Less
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