Dynamics of vesicles from symmetrical double-chain alkylbenzenesulphonates

Abstract

Symmetrical double-chain sodium 1′-(7)-tridecylbenzenesulphonate (7STBS) was prepared by conventional methods from reagent-grade starting materials. Using surface tension measurements two critical micelle concentrations, cmc1 and cmc2, were determined in the binary 7STBS H2O system at different temperatures. In the more concentrated system, 5-10% of surfactant, multilamellar vesicles were observed. Dynamic light scattering of freshly prepared as well as of the aged systems showed an increase in particle diameter on aging. In addition, it was also shown that in aged systems the formation of multilamellar vesicles occurs in the systems with lower surfactant content than in the freshly prepared ones. © Springer-Verlag 1999 References.