title: Particle self-assembly in ionic liquid-in-water Pickering emulsions.
abstract: We report the self-assembly of a single species or a binary mixture of microparticles in ionic liquid-in-water Pickering emulsions, with emphases on the interfacial self-assembled particle structure and the partitioning preference of free particles in the dispersed and continuous phases. The particles form monolayers at ionic liquid-water interfaces and are close-packed on fully covered emulsion droplets or aggregated on partially covered droplets. In contrast to those at oil-water interfaces, no long-range-ordered colloidal lattices are observed. Interestingly, other than equilibrating at the ionic liquid-water interfaces, the microparticles also exhibit a partitioning preference in the dispersed and continuous phases: the sulfate-treated polystyrene (S-PS) and aldehyde-sulfate-treated polystyrene (AS-PS) microparticles are extracted to the ionic liquid phase with a high extraction efficiency, whereas the amine-treated polystyrene (A-PS) microparticles remain in the water phase.
authors.affiliation: School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287, United States.
authors.forename: Huan
authors.initials: H
authors.lastname: Ma
authors.forename: Lenore L
authors.initials: LL
authors.lastname: Dai
mesh_terms: D004655:Emulsions / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D010316:Particle Size; D014867:Water / Q000737:chemistry*
chemical_list: D004655:Emulsions; D052578:Ionic Liquids; D014867:Water