Near-wall molecular ordering of dilute ionic liquids

Monchai Jitvisate, James Richard Thorley Seddon

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
66 Downloads (Pure)

Abstract

The interfacial behavior of ionic liquids promises tunable lubrication as well as playing an integral role in ion diffusion for electron transfer. Diluting the ionic liquids optimizes bulk parameters, such as electric conductivity, and one would expect dilution to disrupt the near-wall molecular ordering. We study this ordering in the ionic liquids [Emim]+[NTf2]−, [Emim]+[DCA]−, and [C4mpyr]+[NTf2]−, diluted in the solvent dimethyl sulfoxide. We found a structural crossover from well-ordered ionic liquids to a well-ordered solvent with increasing dilution, but this occurs nonlinearly, with solvent molecules initially space-filling and solvating and later disrupting the ionic layers. This is of key importance for ionic liquids as optimized tunable nanolubricants.
Original languageEnglish
Pages (from-to)18593-18597
JournalJournal of physical chemistry C
Volume121
Issue number34
DOIs
Publication statusPublished - 8 Aug 2017

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