CONDUCTOMETRIC, SURFACE-TENSION AND THERMODYNAMIC STUDIES OF AQUEOUS SODIUM DODECYLBENZENE SULFONATE IN PYRIDINE AND ISOMERIC PICOLINES

Conductivity and surface tension data have been measured for the aqueo us solutions of sodium dodecylbenzene sulphonate in pyridine, alpha-, beta- and gamma-picolines at 298.15, 308.15 and 318.15 K. The observed data have been utilized to evaluate the counter-ion association const ant (alpha) and limiting equivalent conductance (Lambda(0)). Surface a nd thermodynamic properties of micellization, adsorption at liquid-air interface and transfer of surfactant from aqueous to mixed solvent ha ve been reported. The process of micellization as well as adsorption a t liquid-air interface are favoured by enthalpy as well as entropy eff ects. The observed data have also been analysed in terms of intermolec ular interactions operating among the various components in the soluti on.