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Volume 129, 2005
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Simulation of interfaces between room temperature ionic liquids and other liquids

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Abstract

The structure and properties of the interfaces between the room temperature ionic liquid dimethylimidazolium chloride ([dmim]Cl) and different Lennard–Jones fluids and between ionic liquid and water have been studied by molecular dynamics simulations, and compared to the ionic liquid–vapour interface. Two contrasting types of interface were investigated, thermodynamically stable interfaces between ionic liquid and vapour and between ionic liquid and Lennard–Jones fluids, and diffusing interfaces between miscible phases of different compositions involving water. The density profiles of different species through the interface are presented. The cations and water molecules near the former type of interface are aligned relative to the surface, but no orientational preference was found near or in the broad diffusing interface. The ionic liquid has a negative electrostatic potential relative to vapour or Lennard–Jones fluid, but is more positive than pure water. This contrast is explained in terms of the relative importance of orientation and concentration differences in the two types of interface.

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Publication details

The article was received on 14 Apr 2004, accepted on 20 May 2004 and first published on 21 Sep 2004


Article type: Paper
DOI: 10.1039/B405514D
Citation: Faraday Discuss., 2005,129, 57-67
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    Simulation of interfaces between room temperature ionic liquids and other liquids

    R. M. Lynden-Bell, J. Kohanoff and M. G. Del Popolo, Faraday Discuss., 2005, 129, 57
    DOI: 10.1039/B405514D

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