Use of Highly Hydrophobic Ionic Liquids for Ion-selective Electrodes of the Liquid Membrane Type
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概要
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The phase-boundary potential at the interface between an aqueous KCl solution (W) and a hydrophobic room-temperature ionic liquid (RTIL), trioctylmethylammonium bis(nonafluorobutylsulfonyl)imide ([TOMA+][C4C4N-]), containing dicyclohexano-18-crown-6 (DCH18C6), shows the nernstian response to K+ in W within a polarized potential window of 500 mV between [TOMA+][C4C4N-] and W, demonstrating that hydrophobic RTILs can be used as a nonvolatile ionic medium for liquid-membrane ion-selective electrodes. The complex formation constant of K+ with DCH18C6 in [TOMA+][C4C4N-] is estimated to be on the order of 109 from the upper detection limit using a partition equilibrium model in the presence of a neutral ionophore. The response time of the phase-boundary potential is ∼20 min. Gelled [TOMA+][C4C4N-] also shows the nernstian response to K+, although the upper limit is lower probably due to a change in the solvent properties from the non-gelled [TOMA+][C4C4N-]. The response time of the gelled [TOMA+][C4C4N-] is ∼5 min, shorter than that of the non-gelled [TOMA+][C4C4N-].
- 2008-10-10
著者
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MURAKAMI Hiroshi
Department of Mechanical Engineering, Faculty of Engineering, Kyushu Sangyo University
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NISHI Naoya
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University
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YASUI Yukinori
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University
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KAKIUCHI Takashi
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University
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Nishi Naoya
Department Of Energy And Hydrocarbon Chemistry Graduate School Of Engineering Kyoto University
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Yasui Yukinori
Department Of Energy And Hydrocarbon Chemistry Graduate School Of Engineering Kyoto University
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Kakiuchi Takashi
Department Of Chemical Science Graduate School Of Natural Science And Technology Kanazawa University
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Murakami Hiroshi
Department Of Biochemistry And Cell Biology Graduate School Of Medicine Nagoya City University
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Murakami Hiroshi
Department Of Energy And Hydrocarbon Chemistry Graduate School Of Engineering Kyoto University
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Murakami Hiroshi
Department of Applied Chemistry, Nagoya Institute of Technology
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Kakiuchi Takashi
Department of Agricultural Chemistry and Research Center for Cell and Tissue Culture, Faculty of Agriculture, Kyoto University
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