Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 280, Issue 1-2, Pages 1-6Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2007.10.014
Keywords
catalysis; colloids; copolymerization; gold nanoparticles; thermoresponsive
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The copolymer of poly(N-isopropylacrylamide)-co-poly(4-vinylpyridine) was synthesized by free radical copolymerization of 4-vinylpyridine and N-isopropylacrylamide. The copolymer synthesized with the feed monomer ratio of 4-vinylpyridine/N-isopropylacrylamide equal to 1/3 was associated to form thermoresponsive colloid in neutral water at room temperature, the average size and the cloud-point temperature of which were 40 nm and 32 degrees C, respectively. The thermoresponsive colloid was used as scaffold to load 2-nm An nanoparticles to form the responsive catalyst of colloid-stabilizing gold nanoparticles. The catalysis in the model reduction of 4-nitrophenol with NaBH4 suggested that the catalytic reduction could be modulated due to the thermoresponsive phase-transition of the colloid-stabilizing gold nanoparticles. That was, the catalytic reduction firstly accelerated with the increase in temperature below the cloud-point temperature and then decelerated with the increase in temperature above the cloud-point temperature of the thermoresponsive colloid-stabilizing An nanoparticles. (C) 2007 Elsevier B.V. All rights reserved.
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