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Influence of electric potential on the apparent viscosity of an ionic liquid: facts and artifacts
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0002-7413-2220
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-8935-8070
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2016 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, no 38, 26609-26615 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 18, no 38, 26609-26615 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-196074DOI: 10.1039/c6cp02846bISI: 000385175000029PubMedID: 27711405ScopusID: 2-s2.0-84989914198OAI: oai:DiVA.org:kth-196074DiVA: diva2:1047121
Funder
Knut and Alice Wallenberg Foundation, KAW2012.0078Swedish Research Council, 2014-4694
Note

QC 20161116

Available from: 2016-11-16 Created: 2016-11-11 Last updated: 2016-12-15Bibliographically approved

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