Multilayer Magnetic Composite Particles with Functional Polymer Brushes as Stabilizers for Gold Nanocolloids and Their Recyclable Catalysis

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• 作者：Bin Liu ; Dongwei Zhang ; Jianchao Wang ; Cheng Chen ; Xinlin Yang ; Chenxi Li
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：March 28, 2013
• 年：2013
• 卷：117
• 期：12
• 页码：6363-6372
• 全文大小：399K
• 年卷期：v.117,no.12(March 28, 2013)
• ISSN：1932-7455

文摘

The functional poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) brush was grafted onto the alkyl-bromide-modified magnetite/silica/poly(N,N鈥?methylenebisacrylamide-co-2-hydroxyethylmethacrylate) (Fe₃O₄@SiO₂@PHEMA) trilayer microspheres via the surface-induced atom transfer radical polymerization. Fe₃O₄@SiO₂@PHEMA trilayer microspheres with surface alkyl bromide groups were prepared by the combination of sol鈥揼el process for the synthesis of Fe₃O₄@SiO₂ core鈥搒hell inorganic component and distillation鈥損recipitation polymerization for the formation of PHEMA shell together with the subsequent esterification of the surface hydroxyl group and 2-bromoisobutyryl bromide. Furthermore, the gold nanoparticles were facilely loaded into the functional PDMAEMA brushes through the in situ reduction due to their strong coordinate interaction. These PDMAEMA brush-stabilized gold nanocolloids were used as a catalyst with the reduction of 4-nitophenol to 4-aminophenol as a model reaction, which revealed a highly catalytic efficiency and good reusable property.