| 초록 |
Shape and chemical composition of polymeric Janus particles have a significant impact on their amphiphilies. We developed a simple method to create polystyrene/poly(2-vinylpyridine) (PS/P2VP) Janus particles by oil-in-water emulsion technique, and applied to stabilize Pickering emulsions of toluene and water, where the surfactant properties were completely reversible in response to solution pH. A distinct morphological transition of the Janus particles from snowman-type to spherical shape were achieved by tuning the composition, surfactant, solvent, and the amount of cross-linkable group. To elucidate the amphiphilic property of Janus particles composed of hydrophobic PS and pH-sensitive hydrophilic P2VP, types of Pickering emulsions were monitored in response to changes in solution pH ranging from pH 2 to pH 10. Moreover, recovery of Janus particle surfactants with easy separation and purification was demonstrated by incorporating magnetic nanoparticles into Janus particles. |
