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Anomalous Mixing State in Room-Temperature Ionic Liquid-Water Mixtures: N, N-diethyl-N-methyl-N-(2-methoxyethyl) Ammonium Tetrafluoroborate

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Abstract

The mixing states of room-temperature ionic liquid (RTIL) H2O mixtures (x = 0.0 mol pct to 99.5 mol pct H2O) were investigated using wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and optical absorption in an ultraviolet and visible (UV-vis) region. The RTIL is N, N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate, [DEME][BF4]. In a “prepeak” region of the WAXS, the scattered intensities increased at 85 mol pct to 95 mol pct. A medium-range order (MRO) in the liquid structure as observed in network-forming materials developed markedly. In the SAXS experiments, we can detect nanoscale fluctuations relating to polar and nonpolar regions. At 65 mol pct to 85 mol pct, the SAXS intensity increased unexpectedly. Furthermore, entirely different optical absorption spectra in the UV-vis region were observed as a macroscopic property from 90 mol pct to 95 mol pct. We suppose that these anomalies relate to the MRO of the liquid structure. All anomalies probably are induced by an intrinsic property in [DEME][BF4]-H2O mixtures.

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Acknowledgments

We appreciate Ms. M. Yasaka and Mr. A. Kishi of Rigaku Co. for experimental support and helpful discussion.

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Authors and Affiliations

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

    Masami Aono (Doctor), Yusuke Imai (Graduate Student), Yosuke Ogata (Undergraduate Student), Hiroshi Abe (Doctor) & Hitoshi Matsumoto (Professor)

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

    Takefumi Goto (Graduate Student), Yukihiro Yoshimura (Doctor) & Takahiro Takekiyo (Doctor)

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

    Takashi Arai (Professor)

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  1. Masami Aono
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  2. Yusuke Imai
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  3. Yosuke Ogata
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  4. Hiroshi Abe
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  5. Takefumi Goto
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  6. Yukihiro Yoshimura
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  7. Takahiro Takekiyo
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  8. Hitoshi Matsumoto
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  9. Takashi Arai
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Corresponding author

Correspondence to Hiroshi Abe.

Additional information

Manuscript submitted February 26, 2010.

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Aono, M., Imai, Y., Ogata, Y. et al. Anomalous Mixing State in Room-Temperature Ionic Liquid-Water Mixtures: N, N-diethyl-N-methyl-N-(2-methoxyethyl) Ammonium Tetrafluoroborate. Metall Mater Trans A 42, 37–40 (2011). https://doi.org/10.1007/s11661-010-0311-6

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  • DOI: https://doi.org/10.1007/s11661-010-0311-6

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