Membrane osmometry of aqueous micellar systems

Summary The number average micellar molecular weights,M_n, were determined with the application of membrane osmometry, for various nonionic and a cationic surfactant, in aqueous solutions. These results show that these micelles are monodisperse, as also reported by other investigators. The dependence ofM_n on temperature was also studied. It was found that both the nonionic and the cationic micelles showed an abrupt change in logM versus temperature plots. In the case of nonionics, the abrupt change was observed at approximately 30 °C lower than the cloud-point.Presented at the 25th Colloid-Meeting in Munich, October 13–15, 1971.