Silver nanocomposites based on water-soluble (co)polymers of 2-dialkylaminoethyl methacrylates: Kinetics of formation and pH effect

Abstract

It was revealed that the neutral hydrophilic comonomer nature affects the reduction of silver ions by copolymers of 2-dimethylaminoethyl methacrylate and the formation of Ag0 nanocomposites based on them. The kinetic of silver reduction was investigated, and rate constants of pseudo first-order reactions were determined. It was shown that the rate constants increase in series 4-acryloyl morpholine <N-methyl-N-vinylacetamide < 2-deoxy-2-methacrylamido-d-glucose. The optimal molar ratio [polymer unit] : [Ag+] and polymer concentration were established. It was established that spherical silver nanoparticles have the mean radius of 7–9 nm. A decrease in the pH of aqueous dispersions of nanocomposites leads to narrowing of the surface plasmon resonance band and to shifting to shorter wavelengths. In this case, the hydrodynamic radius increases. It is assumed that the observed effect is caused both by a change in the distance between nanoparticles and by their mutual arrangement in the associate.