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When the theoretical values of the interfacial tension -resulting from thehomogeneous distribution of ionic surfactant molecules amongst the interface ofemulsion drops- are plotted against the total surfactant concentration, theyproduce a curve comparable to the Gibbs adsorption isotherm. However, theactual isotherm takes into account the solubility of the surfactant in theaqueous bulk phase. Hence, assuming that the total surfactant population isonly distributed among the available oil/water interfaces, one can calculatewhat surface concentration is necessary to reproduce the experimental values ofthe interfacial tension. A similar procedure can be followed using the zetapotential of the drops as a standard for a given set of salt and surfactantconcentrations. We applied these procedures to the case of hexadecane/waternanoemulsions at different salt concentrations. This information was used tocompute typical interaction potentials between non-deformable nanoemulsiondrops. The results indicate that there are significant differences between thesurfactant population expected from macroscopic adsorption isotherms, and theactual surfactant popula- tion adsorbed to the surface of nanoemulsion drops.

A Novel Algorithm for the Estimation of the Surfactant Surface Excess at Emulsion Interfaces