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A Conductometric Study of the Ionic Liquid Surfactant(C
14mimBr) in Binary Mixtures
HE Yi, SUN Lei, ZHAO Dandan, HAN Chunyu,et al
Micellar properties of ionic liquid surfactant, 1tetradecyl3methylimidazolium bromide (C14mimBr) were investigated by means of electrical conductometry with emphasis on the influence of cosolventwater content and temperature. The critical micelle concentration (CMC) and the degree of counterion association (g) were calculated from the electrical data. The thermodynamic parameters applied an equilibrium model for micelle formation were obtained. It turned out that the standard Gibbs energies of micellization (ΔGm) was always negative indicating the spontaneity of micelle formation, but it is roughly independent of temperature. In EGpoor mixtures, the micelle formation is affected by entropyenthalpy compensation, whereas it is driven by enthalpy in EGrich mixtures.
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