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Catalytic properties of gold nanoparticles immobilized on the surfaces of nanocarriers
Authors:Xi Chen  Dongyun Zhao  Yingli An  Linqi Shi  Wenchao Hou and Li Chen
Institution:(1) School of Material Science and Chemical Engineering, Tianjin Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University, Tianjin, 300160, People’s Republic of China;(2) Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, China
Abstract:Gold nanoparticles are immobilized in the hydrophilic coronas of spherical micelle carriers for high catalytic activity. The micelle is formed by self-assembly of block copolymer, polystyrene-b-poly (acrylic acid), in basic aqueous solution (pH 10) and has a polystyrene core and a poly (acrylic acid) corona. The gold nanoparticles are anchored into the poly (acrylic acid) corona by in situ reduction of the mixture of HAuCl4 and micelle with NaBH4. The sizes of the gold nanoparticles can be adjusted by changing the content of the HAuCl4. In the process of catalyzing p-nitrophenol to p-aminophenol, the reaction shows one-order kinetics, furthermore, the reaction rate increases with the concentration of composites as well as reaction temperature. Comparing the composites with polystyrene as core and poly (4-vinylpyridine)/Au as corona, the catalytic activity of the present composites is higher, which is ascribed to their hydrophilic corona structure.
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