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The phase behavior and solubilization of two microemulsion systems 1-alkyl-3-methylimidazolium bromide (C n mimBr,  n  = 12,14,16)/butyric acid/hexane/brine (5% NaCl) and C n mimBr/1-butanol/hexane/brine (5% NaCl) were studied and compared. The physico-chemical parameters, such as the solubility (∊  B  ) of the cosurfactant, the mass fraction of the cosurfactant in the interfacial layer ( A S  ), and the solubilization ability ( SP *) of the two microemulsion systems were calculated and discussed. As the carbon chain length of C n mimBr molecules increases,  SP * increases, and the difference of  SP * values between the two microemulsion systems is reduced. The effects of aqueous and oleic phases and temperatures on the phase behavior and solubilization of C 14 mimBr/butyric acid/alkane/aqueous phase microemulsion systems were also discussed.

Phase Behavior and Solubilization of Microemulsion Systems Containing Imidazolium Type Surfactant C n mimBr and Butyric Acid as Cosurfactant