Analysis of dynamic surface tension data for SDS–DTAB mixed solutions

Abstract

From dynamic surface tension data the micelle kinetics dissolution constants for SDS–DTAB mixed solutions of the two components and the highly surface active complex are determined. The experiments at different mixing ratios 1∶10, 1∶1 and 10∶1 allow conclusions about the competitive adsorption of the complex and the respective free component. It turns out that the micelle kinetics constant of dissolution for SDS is about one order of magnitude larger than the respective constant for DTAB, while the respective constant for the complex is again one order of magnitude smaller than that of DTAB. These constants are inversely proportional to the micelle relaxation times. Thus the complex micelles are most stable, while DTAB and SDS micelles are 10 and 100 times less stable, respectively.