Abstract
Measurements of counterion self-diffusion in mixed anionic/nonionic surfactant aqueous solution have been performed to study the dependence of micellar ion binding on micellar composition. The systems studied were mixtures of lithium dodecyl sulfate (LiDS) and ethylene glycol dodecyl ethers having different ethylene oxide chain lengths. A mixed micellar system comprising LiDS and a zwitterionic surfactant was also included in the study. Surfactant and micellar self-diffusion coefficients were obtained to estimate changes in micellar size accompanying the variation in the surfactant mixing ratio. The self-diffusion measurements were performed using the Fourier transform NMR pulsed gradient spin-echo technique. Counterion binding was found to be strongly dependent on mixed micellar composition in terms of micellar surface charge density, aggregate size/shape, and chemical nature of the nonionic surfactant headgroup.
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