Micellization of sodium oleate in water-d2 as probed by proton longitudinal magnetic relaxation and self-diffusion measurements

Proton longitudinal relaxation rates of sodium oleate in aqueous solutions, as a function of surfactant concentration, indicate beyond the cmc (7×10 −4 M)a modification of micell size and/or shape. This is confirmed by measurements of the surfactant self-diffusion coefficient. Water self-diffusion coefficients tend to show that oblate aggregates are progressively formed up to 5×10 −3 M, the concentration above which they remain of constant shape