Abstract
The cloud point phenomenon has been investigated for the solutions of polyoxyethylene (POE)-type nonionic surfactants (C 12E 5, C 12E 6, C 12E 7, C 10E 6, and C 14E 6) in 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF 4), a typical room temperature ionic liquid (RTIL). The cloud point, T c , increases with the elongation of the POE chain, while decreases with the increase in the hydrocarbon chain length. This demonstrates that the solvophilicity/solvophobicity of the surfactants in RTIL comes from POE chain/hydrocarbon chain. When compared with an aqueous system, the chain length dependence of T c is larger for the RTIL system regarding both POE and hydrocarbon chains; in particular, hydrocarbon chain length affects T c much more strongly in the RTIL system than in equivalent aqueous systems. In a similar fashion to the much-studied aqueous systems, the micellar growth is also observed in this RTIL solvent as the temperature approaches T c . The cloud point curves have been analyzed using a Flory–Huggins-type model based on phase separation in polymer solutions.
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