Abstract:

A new electrochemical method is showed for study of physical chemisty character of surfactant systems, and particularly determination of second CMC. The diffusion coefficients of SDS and CATB micelles with different shapes are determined by cyclic voltammetry without any probe, and the first CMC and second CMC are obtained from the intersections of diffusion coefficients vs concentration curve (first CMC and second CMC are 8.0 ×10-3mol•L-1 and 5.6 ×10-2mol•L-1 for SDS, 8.9×10-4 and 2.1 ×10-2 mol•L-1 for CTAB)

Key words: Micelle, First CMC, Second CMC, Cyclic Voltammetry, Diffusion Coefficient