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Abstract
The composition and structural parameters of W/O microemulsions containing gemini surfactant 1,4-bis(3-dodecylimidazolium-1-yl)butane bromide [C12(Bim)2-2Br] and W/O microemulsions containing ionic liquid type surfactant 1-dodecyl-3-methylimidazolium bromide (C12mimBr) were studied and compared at different molar ratios of water to surfactant (ωo). The mole fractions of the alcohol in the interfacial layer in C12(Bim)2-2Br-based systems are always larger than that in C12mimBr-based systems. However, the mole fractions of the alcohol in the oil phase
are nearly the same for both the systems. The C12(Bim)2-2Br-based systems have greater absolute values of the Gibbs energy (−ΔG
o
o→i
) than that of C12mimBr-based systems. In the C12(Bim)2-2Br-based systems, a large number of cosurfactants at the interfacial layer is conducive for the formation of a smaller droplet. The effects of alcohols, alkanes, and salinity on the composition and structural parameters of the two systems were also investigated and discussed.
