Tuning colloid-interface interactions by salt partitioning

24 Aug 2016  ·  Everts Jeffrey, Samin Sela, van Roij René ·

We show that the interaction of an oil-dispersed colloidal particle with an oil-water interface is highly tunable from attractive to repulsive, either by varying the sign of the colloidal charge via charge regulation, or by varying the difference in hydrophilicity between the dissolved cations and anions. In addition, we investigate the yet unexplored interplay between the self-regulated colloidal surface charge distribution with the planar double layer across the oil-water interface and the spherical one around the colloid... Our findings explain recent experiments and have direct relevance for tunable Pickering emulsions. read more

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Soft Condensed Matter Statistical Mechanics Chemical Physics