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Issue 38, 2016
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Influence of electric potential on the apparent viscosity of an ionic liquid: facts and artifacts

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Abstract

According to recent findings, the steady shear viscosity of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][Tf2N]) decreases significantly under the influence of electric potential. This implies a causal connection between nanoscale ordering at the electrified interface and a macroscopic change of transport properties. To study this phenomenon in more detail, we reproduced the above-mentioned measurements; however, we find no evidence that the viscosity of [Emim][Tf2N] is a function of electric potential. Additionally, our results show that steady shear measurements can lead to artifacts that, at first glance, may appear to be potential-induced changes in viscosity. We demonstrate that the artifacts result from a sliding electrical contact at the working electrode of the electrochemical cell and we suggest to consider our findings for future viscosity measurements of ionic liquids.

Graphical abstract: Influence of electric potential on the apparent viscosity of an ionic liquid: facts and artifacts

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Supplementary files

Article information


Submitted
28 Apr 2016
Accepted
06 Sep 2016
First published
06 Sep 2016

Phys. Chem. Chem. Phys., 2016,18, 26609-26615
Article type
Paper

Influence of electric potential on the apparent viscosity of an ionic liquid: facts and artifacts

M. A. Ploss, M. W. Rutland and S. Glavatskih, Phys. Chem. Chem. Phys., 2016, 18, 26609
DOI: 10.1039/C6CP02846B

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