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Received September 21, 2013
Accepted April 17, 2014
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Effect of crosslinker feed content on catalaytic activity of silver nanoparticles fabricated in multiresponsive microgels

Institute of Chemistry, University of the Punjab, New Campus Lahore 54590, Pakistan 1Centre for Undergraduate Studies, University of the Punjab, New Campus Lahore 54590, Pakistan 2Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan
zhfarooqi@gmail.com
Korean Journal of Chemical Engineering, September 2014, 31(9), 1674-1680(7), 10.1007/s11814-014-0117-0
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Abstract

We investigated the effect of crosslinking density of poly(N-isopropyl acrylamide-co-acrylic acid) microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels. Multiresponsive poly(N-isopropyl acrylamide-co-acrylic acid) microgels with 2, 4, 6 and 8 mole percentage of N,N-methylene-bis-acrylamide were synthesized by emulsion polymerization. These microgels were characterized by dynamic light scattering and were used as microreactors to synthesize silver nanoparticles. Hybrid system was characterized by ultraviolet-visible spectroscopy. The_x000D_ catalytic activity of hybrid microgels with different crosslinker content was compared by studying the reduction of pnitrophenol as a model reaction. Kinetics of reaction was monitored by spectrophotometry. The value of the apparent rate constant decreases from 0.568 to 0.313 min^(-1), when content of crosslinker are increased from 2 to 8 mole percentage respectively. This decreases in value of apparent rate constant is due to increase in diffusional barrier offered by_x000D_ high crosslinking of polymer network at high mole percentages of N,N-methylene-bis-acrylamide.

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