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Abstract
We probe the effect of polymer-surfactant complexation at oil-water emulsion interface on the stability of emulsions using inter-droplet forces, hydrodynamic diameter and zeta potential measurements. The polymer used in our experiment was a statistical copolymer of polyvinyl alcohol and vinyl acetate copolymer (PVA-Vac) and the emulsion was an oil-in-water system with an average droplet diameter of 200 nm. At low surfactant concentrations, the force measurement results show that the interaction of surfactant monomers with the adsorbed polymers at droplet interface drastically changes polymer conformation and the onset of repulsion between the droplets, a condition favourable for enhanced emulsion stability. Interestingly, at low surfactant concentrations, the hydro
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