Abstract
The effect of the addition of the hydrophilic ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate [C4mim][BF4] on the micellization of cetyltrimethylammonium bromide (CTAB) in aqueous solution was studied using electrical conductivity, density, speed of sound and spectroscopic techniques. From the CMC values and their temperature dependence, various thermodynamic parameters such as standard free energy (ΔGm0), enthalpy (ΔHm0) and entropy (ΔSm0) of the micellization were determined in the temperature range of 288.15K to 318.15K. Fourier transform infrared spectroscopy (FTIR) and UV–vis spectroscopy were employed to get information regarding the interaction between the surfactant and ionic liquid aggregates. The calculated thermodynamic parameters |ΔHm0| is smaller than |TΔSm0| which suggests that the micellization is entropy driven.
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