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Issue 37, 2010
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Micellar transitions in the aqueous solutions of a surfactant-like ionic liquid: 1-butyl-3-methylimidazolium octylsulfate

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Abstract

We have observed dual transitions in various physical properties while investigating the surfactant-like behavior of the ionic liquid (IL) 1-butyl-3-methylimidazolium octylsulfate [C4mim][C8SO4] in aqueous media. Interestingly, in conductivity measurements, it was found that the second transition, which is comparatively weak in pure water, can be modulated and tuned to the desired concentration without affecting the first transition by the addition of a suitable electrolyte. Using an array of techniques, such as conductivity, ultrasonics, TEM, cryo-TEM, DLS, 1H NMR and 2D 1H–1H NOESY, it has been revealed that the first transition corresponds to the anionic aggregation with imidazolium cations adsorbed as counterions, and the second transition corresponds to the restructuring of the initially formed aggregates in a way that the alkyl chain of the imidazolium cation is incorporated towards the micellar core, leading to a unique mixed micelle-type structure in a single IL system.

Graphical abstract: Micellar transitions in the aqueous solutions of a surfactant-like ionic liquid: 1-butyl-3-methylimidazolium octylsulfate

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Publication details

The article was received on 03 Mar 2010, accepted on 03 Jun 2010 and first published on 09 Aug 2010


Article type: Paper
DOI: 10.1039/C003855P
Citation: Phys. Chem. Chem. Phys., 2010,12, 11728-11735
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    Micellar transitions in the aqueous solutions of a surfactant-like ionic liquid: 1-butyl-3-methylimidazolium octylsulfate

    T. Singh, M. Drechsler, A. H. E. Müeller, I. Mukhopadhyay and A. Kumar, Phys. Chem. Chem. Phys., 2010, 12, 11728
    DOI: 10.1039/C003855P

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