| Project/Area Number |
02453079
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業物理化学・複合材料
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| Research Institution | Okayama University |
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Principal Investigator |
TARI Isao Fac. Engineering, Professor, 工学部, 教授 (00026014)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEDA Shin-ichi Fac. Engineering, Assistant, 工学部, 助手 (80188193)
HAYASHI Hidetaka Fac. Engineering, Lecturer, 工学部, 講師 (90164954)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | controlled surface reaction / material / potentiometric titration / electroplating / codeposition / manganese dioxide / coprecipitation / glass |
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| Research Abstract |
1. Electrochemical properties (porosity, crystal structure) of electrolytic manganese dioxide (EMD) was found to be evaluated from the potentiometric titration carves obtained for solutions of MNO_3 (M^+ : Li^+, Na^+ and K^+) and Zn (NO_3)_2 with or without EMD powder, and the process of stepwise reduction of the oxide by aqueous hydrazine solution containing MNO_3. A new method for preparation of EMD having excellent characteristics as a positive material for alkaline battery has been developed.
2. Factors affecting the codeposition of sparingly soluble particles during electroplating was investigated using acidic copper sulfate and zinc sulfate baths containing alpha-Al_2O_3, TiO_2 and BaSO_4 powders. Such a mechanism on the codeposition that existence of chemically bound CU^<2+> and Zn^<2+> at the particle surface is essential for the particles to be deposited in the metals plated has been proposed.
3. Stress corrosion of soda-lime-silica glass was found to depend on both the concentration and the nature of the electrolytes and solution pH. Strong interaction between the glass and divalent cations (especially Zn^<2+>) brought about by chemical reactions resulted in inhibition of stress corrosion of the glass.
4. Mullite and ferrite as a complex oxide was surface-chemically investigated in order to apply the results to well difined and controlled preparation of a complex oxide consisting of two kinds of metal oxides.
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