Analysis of the fast relaxation times for micelle kinetics taking into account new EMF data

Abstract

The analysis of the concentration dependence of the fast relaxation time associated with monomer/micelle exchange in several ionic surfactants has been carried out using different modifications of the original Annianson and Wall relaxation equation and taking into account new emf data from surfactant-selective electrode measurements. In most of the published work describing the analysis of the fast relaxation time it has been normal practice to assume that in the micellar region the monomer surfactant concentration is constant and equal to the c.m.c. On the other hand, the electrode measurements have clearly shown that the surfactant monomer concentration decreases significantly in the micellar region. The micellar parameters that can be derived from the analysis of the fast relaxation times are very different when these two conditions are realised.