http://www.sciencedirect.com/science/article/pii/S0032386112004909
Oil-soluble monomers and water-soluble monomers copolymerized in between the voids among the silica particles at the interface, forming amphiphilic Janus polymer shell in which the silica particles are embedded. After removal of the silica particles and the oil core, the corresponding Janus polymeric cages are achieved with uniform and regularly arrayed holes across the shell. The Janus cages are permeable to both organic molecules and particles.
A Pickering emulsion is an emulsion that is stabilized by solid particles (for example colloidal silica or adsorbed polyelectrolytes) which adsorb onto the interface between the two phases. (From Wikipedia)
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