10.1007/s10595-008-2010-1

Abstract

Conductometry is employed to measure the critical micellization concentrations of homologous sodium monoalkyl sulfosuccinates with double-charged surface-active anions and alkyl radicals R containing 10-14 carbon atoms (ROO ë CH 2 CH ( SO 3 Na ) COONa). The degrees of counterion binding with micelles and the Gibbs energy ∆ G m of micellization are calculated. The incorporation of an additional ionogenic group into a surfactant molecule somewhat decreases ∆ G m . For the examined series of surfactants, the increment of ∆ G m due to one methylene group is -4.44 kJ/mol.