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Issue 28, 2009
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Frequency-dependent fluidity and conductivity of an ionic liquid

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Abstract

The frequency- and temperature-dependent shear fluidity, f(ν,T), of the ionic liquid [BMIm]BF4 is presented and compared with its ionic conductivity, σ(ν,T). [BMIm]BF4 is short for 1-butyl-3-methyl-imidazolium tetrafluoroborate. Its DC fluidity, fDC(T), and DC conductivity, σDC(T), are non-Arrhenius and superimpose in an Arrhenius-type representation if the respective inverse temperature axes are made to differ by a small amount, Δ = (1/T− 1/T) > 0. The observed superposition suggests that f(ν,T) should display a frequency dependence similar to σ(ν,T). We have therefore measured f(ν,T) of [BMIm]BF4 over five decades of frequency at different temperatures. The spectra thus obtained corroborate our expectations. We model our experimental results in terms of the MIGRATION concept and arrive at the conclusion that f(ν,T) and σ(ν,T) are Fourier transforms of quite similar time correlation functions.

Graphical abstract: Frequency-dependent fluidity and conductivity of an ionic liquid

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Publication details

The article was received on 02 Mar 2009, accepted on 05 May 2009 and first published on 28 May 2009


Article type: Communication
DOI: 10.1039/B904186A
Citation: Phys. Chem. Chem. Phys., 2009,11, 5930-5934

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    Frequency-dependent fluidity and conductivity of an ionic liquid

    A. Šantić, W. Wrobel, M. Mutke, R. D. Banhatti and K. Funke, Phys. Chem. Chem. Phys., 2009, 11, 5930
    DOI: 10.1039/B904186A

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