
31Adsorption of Surface-Active Species to Gas–Liquid Interfaces
be qualitatively assessed. Milk proteins apparently do not denature
signicantly upon adsorption to gas–liquid interfaces. We can only
speculate that the lipidsin milk may fulll some protective role against
conformational changes.
2.6 Adsorption of Ionic Species
The complexity that arises in ionic surfactant adsorption, as opposed to non-
ionic surfactants, is the effect of electrostatic interactions on both the equi-
librium state and the rate of transport to the interface, due to the existence
of the electric double layer (EDL) near the interface. Figure2.7 illustrates the