ANOMALIES OF THE DYNAMIC SURFACE-TENSION IN CONCENTRATED MICELLAR SOLUTIONS OF IONIC SURFACTANTS

A numerical solution of the problem of the kinetics of the decrease in surface tension, taking the dependence of the concentration of nonomeric surface-active ions and counter-ions on the surfactant concentration into account, was performed on the example of micellar solutions of sodium dodecyl sulfate. It was shown that at a surfactant concentration exceeding the critical micelle concentration by one to two orders of magnitude, the rate of decrease in the surface tension may be reduced in comparison with substantially less concentrated micellar solutions.