A model for monomer and micellar concentrations in surfactant solutions: Application to conductivity, NMR, diffusion, and surface tension data

► An empirical analytical model for surfactant concentrations near the cmc is presented. ► Conductivity, surface tension, NMR shift, and self-diffusion data are well reproduced. ► A method for the robust analytic determination of the cmc of micellar solutions. ► Functions for standard nonlinear (global) regression of surfactant data are given. ► No need for premicellar species in order to reproduce the transition around the cmc.