Free-Energy Approaches for Pickering Emulsions: Particle Exchange between Colloid-Stabilized Droplets
In this presentation we introduce the concept of the "Pieranski potential", which is the free-energy for interfacial absorption of colloidal particles to a liquid-liquid (or liquid-gas) interface. We show how this reduces the problem of computing the equilibrium interfacial absorption configuration of a particle to a geometric problem in the case that interfacial curvature can be ignored. Specifically, we theoretically consider using simple physical arguments the possible cause for exchange of particles between two Pickering droplets, which was recently experimentally observed to occur [D. French et al., Scientific Reports 6, 31401 (2016)]. Finally, we discuss the open problems with regards to this so-called "secret life of Pickering emulsions" and how to best proceed in tackling them.
This is a roughly weekly series of didactical blackboard talks focussing on some theoretical aspect of Condensed Matter, Biological, and Statistical Physics..