| 초록 |
Coating of colloidal particles is used as a means to modify their surface chemical, reactive, catalytic, optical, or magnetic properties. Such core-shell particles can often be prepared by controlled precipitation of inorganic precursors onto the core particles, in some cases assisted by a coupling agent with the combination of silica and gold or silver. The preparation of cationic polystyrene cores was accomplished by surfactant-free emulsion polymerization using the cationic initiator azodiisobutyramidine dihydrochloride (AIBA). After the cationic polystyrene cores were made, the coating reaction was done in ethanol at room temperature by hydrolyzing titanium tetraisopropoxide (TTIP) in the presence of cationic polystyrene spheres. Titania coating on polystyrene particles were characterized by zeta-potential meter, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. |
