Issue 28, 2009
From the journal:

Physical Chemistry Chemical Physics

Frequency-dependent fluidity and conductivity of an ionic liquid

Ana Šantić,ab   Wojciech Wrobel,c   Monika Mutke,ad   Radha D. Banhattia  and  Klaus Funke*a  

* Corresponding authors

a Institute of Physical Chemistry and Sonderforschungsbereich 458, University of Münster, Corrensstraße 30, D-48149 Münster, Germany
E-mail: K.Funke@uni-muenster.de
Fax: +49 251 8329138
Tel: +49 251 8323418

b NMR Center, Ruđer Bošković Institute, Bijenička c. 54, Zagreb, Croatia

c Faculty of Physics, Warsaw University of Technology, Koszykowa 75, Warszawa, Poland

d NRW International Graduate School of Chemistry, University of Münster, Germany

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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Article information

DOI
https://doi.org/10.1039/B904186A
Article type
Communication
Submitted
02 Mar 2009
Accepted
05 May 2009
First published
28 May 2009

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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