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Ionic liquid dynamics measured with implanted-ion β-NMR

ORAL

Abstract

Ionic liquids (ILs) not only found in a wide range of potential applications, spanning energy storage to space travel, but the constituent ions have fascinating dynamics and structure. In this study, we use implanted-ion 8Li β-NMR to probe these dynamics in the IL 1-ethyl-3-methylimidazolium acetate. Sensitivity to nanosecond 8Li+ solvation dynamics is inferred from the motional narrowing of the resonance and the local maxima in the 8Li relaxation rate. We show that the activation energy and Vogel-Fulcher-Tammann temperature associated with the relaxation process agree with the dynamic viscosity. Near the melting point, the lineshape is broad and intense, and the form of the relaxation is non-exponential, reflective of heterogeneous dynamics. This demonstration establishes the feasibility of studing the local structure and dynamics of IL thin films and interfaces using β-NMR1.

1. D. Fujimoto, et al., The dynamics of liquid 1-ethyl-3-methylimidazolium acetate measured with implanted-ion 8Li β-NMR, Chem. Mater. In press.

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Presenters

  • Derek Fujimoto

    University of British Columbia, Physics and Astronomy, University of British Columbia

Authors

  • Derek Fujimoto

    University of British Columbia, Physics and Astronomy, University of British Columbia

  • Ryan M. L. McFadden

    University of British Columbia, Chemistry, University of British Columbia

  • Martin H Dehn

    University of British Columbia, Physics and Astronomy, University of British Columbia

  • Yael Petel

    University of British Columbia

  • Aris Chatzichristos

    University of British Columbia

  • Lars Hemmingsen

    University of Copenhagen

  • Victoria L. Karner

    University of British Columbia, Chemistry, University of British Columbia

  • Robert F Kiefl

    University of British Columbia, Physics and Astronomy, University of British Columbia

  • Philip C. P. Levy

    TRIUMF, University of British Columbia

  • Iain McKenzie

    TRIUMF

  • Carl Michal

    University of British Columbia

  • Gerald Morris

    TRIUMF

  • Matt Pearson

    TRIUMF

  • Daniel Szunyogh

    University of Copenhagen

  • John Ticknor

    University of British Columbia, Chemistry, University of British Columbia

  • Monika K Stachura

    TRIUMF

  • W Andrew MacFarlane

    University of British Columbia, Chemistry, University of British Columbia