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Fabrication of Hollow Micro-particles with Nonspherical Shapes by Surface Sol-gel Reaction  

Cho, Young-Sang (National Center for Integrated Optofluidic Systems and Department of Chemical and Biomolecular Engineering, KAIST)
Jeon, Seog-Jin (Center for Soft Matter Research, New York University)
Yi, Gi-Ra (Nano-Bio System Research Team, Seoul Center, Korea Basic Science Institute)
Publication Information
Korean Chemical Engineering Research / v.45, no.6, 2007 , pp. 611-618 More about this Journal
Abstract
We demonstrate the sol-gel coating technique of colloidal clusters for producing hollow micro-particles with complex morphologies. Cross-linked amidine polystyrene (PS) microspheres were synthesized by emulsifier-free emulsion copolymerization of styrene and divinylbenzene. The amidine PS particles were self-organized inside toluene-in-water emulsion droplets to produce large quantities of colloidally stable clusters. These clusters were coated with thin silica shell by sol-gel reaction of tetraethylorthosilicate (TEOS) and ammonia, and the organic polystyrene cores were removed by calcination at high temperature to generate nonspherical hollow micro-particles with complex morphologies. This process can be used to prepare hollow particles with shapes such as doublets, tetrahedra, icosahedra, and others.
Keywords
Colloidal Clusters; Sol-gel Coating; Hollow Particles; Density Gradient Centrifugation;
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