Self-assembly in aqueous solutions of imidazolium ionic liquids and their mixtures with an anionic surfactant

Left: critical micelle concentration of NaDS in aqueous solutions containing [C 4mim]PF 6, [C 6mim]BF 4 or [C 10mim]Br versus the ionic liquid solvent-free mole fraction; T = 298.15 K. Right: mixed micelle of NaDS–[C 10mim]Br. Experimental data on micellization in aqueous solutions of 1-alkyl-3-meth...

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Veröffentlicht in:Journal of colloid and interface science 2009-08, Vol.336 (2), p.793-802
Hauptverfasser: Smirnova, Natalia A., Vanin, Alexandr A., Safonova, Evgenia A., Pukinsky, Igor B., Anufrikov, Yuri A., Makarov, Alexey L.
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Sprache:eng
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Zusammenfassung:Left: critical micelle concentration of NaDS in aqueous solutions containing [C 4mim]PF 6, [C 6mim]BF 4 or [C 10mim]Br versus the ionic liquid solvent-free mole fraction; T = 298.15 K. Right: mixed micelle of NaDS–[C 10mim]Br. Experimental data on micellization in aqueous solutions of 1-alkyl-3-methylimidazolium salts [C n mim]X and their mixtures with sodium dodecyl sulfate (NaDS) are reviewed. New results (the critical micelle concentration and enthalpy of micellization) are presented for mixtures of [C 4mim]PF 6, [C 6mim]BF 4, [C 6mim]Br and [C 10mim]Br with NaDS. Our data cover a wide range (from 0 to 0.9) of solvent-free based mole fractions of ionic liquid (IL). Even very small addition of ILs substantially decreases the cmc of NaDS due to the combined effect of electrostatic and hydrophobic interactions, and formation of mixed micelles. It is shown that the quasichemical aggregation model by Nagarajan and Ruckenstein may be successfully applied to aqueous solutions of long-chain ILs and their mixtures with NaDS. The local structure of micelles is obtained from all-atom MD simulations for [C n mim]Br and [C n mim]X + NaDS in aqueous medium.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2009.04.004