Abstract
The interfacial and bulk properties of the aqueous solutions of imidazolium-based ionic liquids with different halide anions ([C12mim]Cl, [C12mim]Br, [C12mim]I) were investigated by surface tension and electrical conductivity measurements. The lowest surface tension (γcmc) and maximum surface excess concentration (Γmax) values from the surface tension measurements showed that [C12mim]I had the highest surface activity. The thermodynamic pontentials of micellization (ΔG0m, ΔH0m, ΔS0m) indicated that the micellization of [C12mim]Cl and [C12mim]Br was entropy-driven, while that of [C12mim]I was enthalpy-driven at 15 °C but entropy-driven above 20 °C. This distinct behavior for [C12mim]I was thought to be due to the higher binding affinity of I– to the micellar interface.
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