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

نویسندگان

  • Moritz A Ploss
  • Mark W Rutland
  • Sergei Glavatskih
چکیده

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.

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عنوان ژورنال:
  • Physical chemistry chemical physics : PCCP

دوره 18 38  شماره 

صفحات  -

تاریخ انتشار 2016