Poly(N-isopropylmethacrylamide) microgels for fabrication and stabilization of gold nanoparticles and their use in catalysis Zahoor H. Farooqi, Alisha Irshad School of Chemistry, University of the Punjab, Pakistan Crosslinked polymeric particles have gained a significant attention in current research due to their potential applications in nanotechnology. 1-3 They are being used as micro-reactors for synthesis and stabilization of catalytically active inorganic nanoparticles. In present work, poly(N-isopropylmethacrylamide) microgels were synthesized using a simple free radical precipitation polymerization in aqueous medium. Gold nanoparticles were prepared within dispersion of the polymer microgels by the in-situ reduction of Au (III) ions using sodium borohydride as reducing agent. Both pure and hybrid microgels were characterized using UV-Visible spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscopy. The resulting polymer hybrid material was used as catalyst for reduction of 4-nitroaniline. Kinetics of the reaction catalyzed by the hybrid polymer microgels was monitored using spectrophotometric method. The values of observed rate constant (k obs ) for catalytic reduction of 4-Nitroaniline were evaluated under different reaction conditions to explore the process of catalysis. References 1. Shahid, Z. H. Farooqi, R. Begum, M. Arif, W. Wu and A. Irfan, Crit. Rev. Anal. Chem. , 2020, 50 , 513-537. 2. Begum, Z. H. Farooqi, A. H. Aboo, E. Ahmed, A. Sharif and J. Xiao, J. Hazard. Mater., 2019, 377 , 399-408. 3. Wu, H. Cheng, A. Chang, W. Xu, F. Lu and W. Wu, Chem. Commun. , 2015, 51 , 16068-16071.
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