Preparation of Hybrid Hydrogel Containing Ag Nanoparticles by a Green in Situ Reduction Method

摘要

In this Article, large and uniform Ag nanoparticle-containing hybrid hydrogels were prepared by in situ reductionnof Ag ions in cross-linked tapioca dialdehyde starch (DAS)−chitosan hydrogels. In the hybrid hydrogels, chitosan was chosen as anmacromolecular cross-linker because of its abundant source and good biocompatibility. The hybrid hydrogel showed good waterswellingnproperties, which could be controlled by varying the ratio of chitosan to tapioca DAS in the hydrogel. The reductivenaldehyde groups in the cross-linked hydrogels could be used to reduce Ag ions to Ag nanoparticles without any additionalnchemical reductants. Interestingly, by controlling the reduction conditions such as the tapioca DAS concentration, aqueousnAgNO3 concentration, reaction time, and aqueous ammonium concentration, Ag nanoparticles with different sizes andnmorphologies were obtained. Because of their biocompatibility, degradable constituents, mild reaction conditions, and controllednpreparation of Ag nanoparticles, these tapioca DAS−chitosan/Ag nanoparticle hybrid hydrogels show promise as functionalnhydrogels.