Characterisation of ionic surfactant aggregates by means of activity measurements of a trace probe electrolyte

摘要

On the basis of the Pois-son-Boltzmann cell model a new trace probe electrolyte method was applied to determine the surfactant aggregation number in Poly(ethylene oxide)- Sodium dodecyl sulphate systems. It is demonstrated that activity measurements on a probe electrolyte added to a polymer/surfactant solution in a trace amount can be used for the determination of the mean aggregation number of the surfactant aggregates. An important new finding of the experimental part of this work is that the aggregation number depends only on the equilibrium surfactant concentration and is independent of the polymer concentration.