writer：Bin Liu, Shuxuan Sun, Zhenbo Gao, Guomin Bian, Yonglin Qi, Xinlin Yang* and Chenxi Li
keywords：Silica-g-PDMAEMA hybrid microspheres; Functional polymer brush; Stabilized-metallic nanocolloids.
source：期刊
specific source：Colloid Surf A 456 (1), 195-202 (2014). DOI: 10.1016/j.colsurfa.2014.05.037
Issue time：2014年

The silica-g-poly[2-(N,N-dimethyl amino)ethyl methacrylate] (SiO₂-g-PDMAEMA) hybrid microspheres with polymer brushes were synthesized by the surface-grafted atom transfer radical polymerization (ATRP) from the surface alkyl bromide functionalized silica nanospheres. The inorganic nanosphere as surface-initiating polymerization site was prepared by the amide reaction of 2-bromoisobutyryl bromide with the surface amino group of silica via modification with (3-aminopropyl) trimethoxysilane (APS). The grafted PDMEMA brushes stabilized metallic nanocolloids (silver, and palladium) were prepared by the in-situ reduction of the inorganic salt precursors (AgNO₃, and PdCl₂) through the coordination effect of the amino groups to the metallic atom (Au, Ag). The catalytic properties of PDMAEMA brush-stabilized silver and palladium metallic nanocolloids were investigated via the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AnP) by sodium borohydride (NaBH₄) as a model reaction. The resultant hybrid microspheres were characterized by transmission electron microscopy (TEM), thermal gravimetric analyzer (TGA).