One‐step preparation of hybrid materials of polyacrylamide networks and gold nanoparticles

Abstract

Hybrid materials of polyacrylamide networks and gold nanoparticles were prepared by directly heating an aqueous solution containing HAuCl(4), acrylamide, N,N'-methylenebis-acrylamide, and sodium sulfite (Na(2)SO(3)). Acrylamide, N,N'-methylenebis-acrylamide, and Na(2)SO(3) were used as monomers, crosslinking agent, and initiator, respectively. In the process of polyacrylamide network synthesis, HAuCl(4) was reduced by acrylamide and Na(2)SO(3) into gold nanoparticles and adsorbed on the produced polyacrylamide networks. Transmission electron microscopy proved that the size of gold nanoparticles was in the range of 3-10 nm. Atomic force microscopy showed that the gold nanoparticles homogeneously dispersed into the polyacrylamide networks matrix. The hybrid materials as absorbents may be useful in healthcare, communication technology, building industry, chromatography, water purification, and agriculture.

RAFT-Polymers with Single and Multiple Trithiocarbonate Groups as Uniform Gold-Nanoparticle Coatings

“…Regarding both effects, polymers are the ideal candidates for capping agents, which is a main reason for the large number of studies , conducted on the synthesis and properties of these core–shell nanohybrids, sometimes referred to as “hairy nanoparticles”. Different strategies exist for the synthesis of polymer-encapsulated gold nanoparticles: They can be directly produced in situ by reduction of Au 3+ ions during the polymerization or in the presence of already produced polymers, the polymer can be grown from the nanoparticles’ surface , ( grafting-from ) or the nanoparticles can be coated with preprepared polymers by ligand-exchange ( grafting-to ).…”

Size‐controlled gold nanoparticles inside polyacrylamide microgels

“…Therefore, as the AuNP size increased, the mesh of the crosslinked network began to become saturated; this prevented more water molecules from interacting with amine groups and decreased the particle sizes of the microgels. It is well known that amine groups act as a reductant in HAuCl 4 solutions . However, with amide groups, it is more difficult to reduce the gold from HAuCl 4 because it is not protonated; hence, the gold reduction in this process could be performed by the protonating nitrogen atom when the amide was destabilized by the presence of aqueous HAuCl 4 .…”

Thermoresponsive Gold Nanoparticles with Positive UCST‐Type Thermoresponsivity

“…Amine groups are also well‐known ligands for AuNPs . Since PNAGA has amine groups in each repeat unit, a question arises regarding the use of trithiocarbonate end‐functionalization for grafting purposes onto AuNPs.…”