title: Preparation of multilayered gold-silica-polystyrene core-shell particles by seeded polymerization.
abstract: A preparation method for multilayered gold-silica-polystyrene core-shell composite particles is proposed. The gold-silica core-shell particles of 192-nm-sized, synthesized by coating the 18-nm-sized gold particles with silica by a seeded growth technique, were used as cores for succeeding polystyrene coating. After surface modification of gold-silica composite particles by methacryloxypropyltrimethoxysilane (MPTMS), polymerizations of styrene (0.16-0.4 M) were conducted with 8 x 10(-3) M of potassium persulfate initiator in the presence of 1 x 10(-3) M of sodium p-styrenesulfonate anionic monomer. Multilayered core-shell gold-silica-polystyrene particles that contained a single core could be obtained. The coefficient of variation of size distribution (CV) of the composite particles was less than 7%, and polystyrene shell thickness was in a range of 193 to 281 nm.
authors.affiliation: Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Aoba, Aramaki-aza, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Shunchao
authors.initials: S
authors.lastname: Gu
authors.forename: Junya
authors.initials: J
authors.lastname: Onishi
authors.forename: Eiichi
authors.initials: E
authors.lastname: Mine
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Mikio
authors.initials: M
authors.lastname: Konno
mesh_terms: D006046:Gold / Q000737:chemistry*; D008863:Microspheres; D010316:Particle Size; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D011137:Polystyrenes; D006046:Gold; D012822:Silicon Dioxide