  The present work is trying to explain a discrepancy between experimental
observations of the drainage of foam films from aqueous solutions of sodium
dodecyl sulfate (SDS) and the theoretical DLVO-accomplished Reynolds model. It
is shown that, due to overlap of the film adsorption layers, an adsorption
component of the disjoining pressure is important for this system. The
pre-exponential factor of the adsorption component was obtained by fitting the
experimental drainage curves. It corresponds to a slight repulsion, which
reduces not only the thinning velocity as observed experimentally but corrects
also the film equilibrium thickness.
