Physicochemical studies of 2-propanol in some micellar solutions

Conductance values of sodium dodecyl sulphate and dodecyl trimethyl ammoniu m bromide have been measured in aqueous and 2-propanol+water solutions. The measurements are carried out at 298.15, 308.15 and 318.15 K. From conducti vity data the val;es of critical micelle concentration and counterion assoc iation constant (a) are determined. The observed thermodynamic data reveals that micellisation process is favoured both energetically as veil as by en tropy gain. LH NMR data of solutions indicate that whereas 2-propanol is so lubilised in the interior of SDS micelles, the penetration of 2-propanol in to DTAB micelles is comparatively weak.