Micellisation of CTAB in some Aqueous Binary Mixtures


  • Visva-Bharati University, Department of Chemistry, 731235, India


Free energies (ΔG0m), Entropies (ΔS0m) and Enthalpies (ΔH0m) of micellisation of Cetyl-Trimethyl Ammonium Bromide (CTAB) in glycerol+water mixtures containing 10,30,40, and 50 weight percent of glycerol and in urea+water mix ures containing 10, 30 and 40 weight percent of urea have been reported from CMC measurements at 25,35 and 45°C using the conductance method. Analysis of ΔG0m vs composition of cosolvent plots indicate that micellisation is favoured in both the solvent systems almost to the same extent except for the fact that micellisation is decreased at high concentration of glycerol and increased at high concentration of urea. Entropy (ΔS0m) - composition profiles and Enthalpy (ΔH0m)-composition profiles are more or less similar for both the systems, except at high cosolvent composition.

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