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We theoretically and experimentally investigate colloid-oil-water-interfaceinteractions of charged, sterically stabilized, poly(methyl-methacrylate)colloidal particles dispersed in a low-polar oil (dielectric constant$\epsilon=5-10$) that is in contact with an adjacent water phase. In this modelsystem, the colloidal particles cannot penetrate the oil-water interface due torepulsive van der Waals forces with the interface whereas the multiple saltsthat are dissolved in the oil are free to partition into the water phase. Thesign and magnitude of the Donnan potential and/or the particle charge isaffected by these salt concentrations such that the effective interactionpotential can be highly tuned. Both the equilibrium effective colloid-interfaceinteractions and the ion dynamics are explored within a Poisson-Nernst-Plancktheory, and compared to experimental observations.

Colloid-oil-water-interface interactions in the presence of multiple salts: charge regulation and dynamics