Synthesis and Characterization of Hollow Titania Nanospheres using a Cationic Colloidal Particle as a template

초록

Titania-coated polymeric nanoparticles were synthesized based on the cationic colloidal particles which were prepared by surfactant-free emulsion copolymerization of styrene and butylacrylate in the presence of a cationic monomer, metacryloxyethyltrimethylammonium chloride(MOTAC) using azobis(isobutylamidine hydrochloride)(AIBA) as an initiator. These cationic particles were stabilized by poly(pyrrolidone)(PVP). Then, these particles were dispersed in ethanol and mixed with titanium(IV) butoxide. Negatively charged titania precursors were rapidly reacted onto the cationic surfaces of colloidal particles. The core-shell particles were turned into the hollow titania spheres by calcination of the dried particles in a furnace. The coated particles were characterized with electrophoresis, transmission electron microscopy, scanning electron microscopy, light scattering, XRD and FT-IR.