A new model for the kinetics of drainage of thin liquid films with ionic surfactants

This work presents new study on dynamic effects in thin liquid films (TLF) with ionic surfactants. The conventional theory of TLF drainage has been developed with no account for the dynamic effects originating from the electrical double layer (EDL) due to the complexity of the problem. Experiments on drainage of TLF with non-ionic surfactants show that the dynamics of such films occur in line with the classical theory. On the contrary, films with ionic surfactants show significantly slower dynamics than the prediction of the classical theory. The present paper shows basically why these films drain slower that what is expected. A new kinetic equation is suggested showing better agreement between experiment and theory.