Effect of crosslinker feed content on catalaytic activity of silver nanoparticles fabricated in multiresponsive microgels

다국어 초록 (Multilingual Abstract)

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

참고문헌 (Reference)

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