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Kinetics of Water-Mediated Fluctuations in Room Temperature Ionic Liquid: N, N-Diethyl-N-methyl-N-(2-methoxyethyl) Ammonium Tetrafluoroborate

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Abstract

The kinetics of small-angle X-ray scattering (SAXS) was assessed in the room temperature ionic liquid (RTIL)–x mol% H2O system, where the RTIL is N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate, [DEME][BF4]. During equilibration of a non-equilibrium state, the largest time evolution of SAXS was observed at approximately 90 mol% H2O. Above 85 mol% (x c), the SAXS intensity increased gradually for 24 h. For the larger q region, the prepeak and principal peak in X-ray diffraction patterns have no time dependence in the water-rich region (70–91 mol%). The long time relaxation process observed in SAXS was related to the outstanding pH oscillations at 90–95 mol% over several days in the [DEME][BF4]–water system. The x c for nonequilibrium anomalies is related to the equilibrated crossover concentration from 65–85 mol% (from SAXS) to 85–95 mol% (for the prepeak in X-ray diffraction) in the [DEME][BF4]–H2O system. Inside [DEME][BF4], the dynamic and static properties of hydrogen bonding of water changed drastically at x c.

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Acknowledgments

Authors appreciate Prof. H. Matsumoto of the National Defense Academy and A. Shimizu of Soka University for helpful discussion.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Defense Academy, Hashirimizu 1-10-20, Yokosuka, 239-8686, Japan

    H. Abe, M. Aono, H. Kishimura & S. Ozawa

  2. Department of Applied Chemistry, National Defense Academy, Hashirimizu 1-10-20, Yokosuka, 239-8686, Japan

    T. Takekiyo & Y. Yoshimura

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  1. H. Abe
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  2. M. Aono
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  3. H. Kishimura
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  4. T. Takekiyo
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  5. Y. Yoshimura
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  6. S. Ozawa
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Correspondence to H. Abe.

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Abe, H., Aono, M., Kishimura, H. et al. Kinetics of Water-Mediated Fluctuations in Room Temperature Ionic Liquid: N, N-Diethyl-N-methyl-N-(2-methoxyethyl) Ammonium Tetrafluoroborate. J Solution Chem 43, 1791–1798 (2014). https://doi.org/10.1007/s10953-014-0241-9

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  • DOI: https://doi.org/10.1007/s10953-014-0241-9

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