Microwave-Assisted Self-Organization of Colloidal Particles Inside Water-in-Oil Emulsions |
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Authors: | Young-Sang Cho Gi-Ra Yi |
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Affiliation: | 1. National Creative Research Initiative Center for Integrated Optofluidic Systems and Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , Daejeon , Korea yscho78@illinois.edu;3. Nano-Bio System Research Team, Seoul Center, Korea Basic Science Institute , Daejeon , Korea |
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Abstract: | Commercial amidine polystyrene microspheres were self-organized to obtain colloidal microclusters from water-in-oil emulsion droplets as confining geometries. For demulsification process, microwave was irradiated to remove water droplets selectively resulting in the shrinkage of water droplets which induces inward capillary pressure for the particle self-assembly. The amidine polystyrene clusters were coated with silica nanospheres or titania nanoparticles by co-organizing the mixed particle suspensions inside water droplets by microwave heating. Titania-coated polystyrene clusters were calcined to produce hollow macroporous titania powders. Finally, sulfate-coated polystyrene microspheres were self-assembled with silica nanoparticles to generate polystyrene/silica composite clusters by microwave irradiation method. |
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Keywords: | Colloidal clusters macroporous titania powder microwave irradiation self-assembly |
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