| Project/Area Number |
04453036
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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 |
分析・地球化学
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| Research Institution | Shinshu University |
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Principal Investigator |
IZUTSU Kosuke Shinshu Univ.Faculty of Science, Professor, 理学部, 教授 (70025336)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Toshio Shinshu Univ.Faculty of Science, Associate Professor, 理学部, 助教授 (00020678)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1993: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1992: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Ion solvation / Electrochemical sensor / pH-ISFET / Liquid junction potential between different solvents / Proton solvation / Potentiometry / Functional polymer membrane ion sensor / Nonaqueous solvents / 機能高分子膜イオンセンサー / センサー / リチウムイオン / 水素イオン / ISFET / 液間電位差 |
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| Research Abstract |
Following studies were carried out to develop electrochemical sensors for ion solvation and to apply them in practical researches :
1) Use of pH-ISFETs in nonaqueous solutions as sensors for pH and proton solvation : pH-sensitive ISFETs were first used in nonaqueous solutions by making the commercial ones durable in nonaqueous solvents. They responded in Nernstian ways to the pH in various solvents and to the proton solvation. The responses were much faster than those of the glass elctrodes which are usually used for pH measurements in nonaqueous solutions.the ISFETs were used to determine the acid dissociation constants in gamma-butyrolactone and the transfer activity coefficients of proton between various solvents.
2) Use of a cation-sensitive glass electrode : A univalent cation-sensitive glass electrode was used to study the solvation of lithium ions in various mixed aprotic solvents which are important in lithium battery technologies.
3) Functional polymer membrane ion sensor : A membrane of polyacrylamide coupled to cobalt phthalocyanine complex and coated on a platinum disk was found to be applicable as a sensor for fluoride and cyanide ions in various aprotic solvents.
4) Liquid junction potential between different solvents : In order to use the electrochemical sensors in the study of ion solvation, the problem of the liquid junction potential between different solvents was studied in detail and a new method (three components method) was developed for its estimation.
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