title: Formation and catalytic activity of spherical composites with surfaces coated with gold nanoparticles.
abstract: Micelle-supported gold composites with a polystyrene core and a poly(4-vinyl pyridine)/Au shell are synthesized using NaBH(4) to reduce a mixture of micelle and HAuCl(4) in acidic aqueous solution (pH approximately 2). The template micelle with a polystyrene core and a poly(4-vinyl pyridine) shell is formed by self-assembly of block copolymer polystyrene-block-poly(4-vinyl pyridine). The gold nanoparticles coated onto the surfaces of the composites possess an average diameter of about 15 nm. The composites are applied to catalyze the reduction of p-nitrophenol in the presence of NaBH(4), and the results indicate that the kinetic constant of the reaction increases when the composite concentration and the reaction temperature increase. In addition, research results also indicate that composites with high content of gold show higher catalytic activity and higher catalytic efficiency.
authors.affiliation: Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Dongyun
authors.initials: D
authors.lastname: Zhao
authors.forename: Yingli
authors.initials: Y
authors.lastname: An
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Cheng
authors.forename: Beilei
authors.initials: B
authors.lastname: Wang
authors.forename: Linqi
authors.initials: L
authors.lastname: Shi
mesh_terms: D002384:Catalysis; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D053768:Metal Nanoparticles / Q000737:chemistry*; D008823:Micelles; D009596:Nitrophenols / Q000737:chemistry; D010084:Oxidation-Reduction; D011137:Polystyrenes; D011145:Polyvinyls
chemical_list: D020099:Coated Materials, Biocompatible; D008823:Micelles; D009596:Nitrophenols; D011137:Polystyrenes; D011145:Polyvinyls; C019535:poly(4-vinylpyridine); D006046:Gold; C024836:4-nitrophenol