采用液相还原法,以聚乙烯吡咯烷酮(PVP)为保护剂,水合肼直接还原硝酸银溶液得到稳定分散的纳米银溶胶,并通过冷冻(-20℃)、解冻(20℃)法合成了物理交联的Ag/PVP/PVA水凝胶.利用透射电子显微镜(TEM)、紫外可见光谱(UV-vis)、X射线衍射(XRD)以及红外分析(FT-IR)对制备的复合材料进行了表征,以大肠杆茵为细茵模型测试了样品的抗茵性能并分析了抗茵原理.结果表明,所得银溶胶中纳米银平均粒径约为50nm,由于纳米银的引入,该新型水凝胶具有抗茵性能,是一种具有开发前景的复合材料.
Nanometer silver colloid were synthesized from AgNO_3 by chemical reduction in the liquid phase with hydrazine hydrate as the reducing agent, polyvinyl pyrrolidone(PVP) as the protective agents, and physically cross-linked nanometer silver/polyvinylpyrrolidone/polyvinyl alcohol (Ag/PVP/PVA) hydrogels were synthesized by freezing at - 20℃ and thawing at 20 ℃. The product was characterized by transmission electron microscopy (TEM), UV-vis spectrophotometer(UV-vis), X-ray diffraction(XRD) and fourier transform infrared spectroscopy (FT-IR), the antimicrobial mechanism and property were investigated by escherichia coli as a model in this work. And the results show that nanosilver particles are about 50 nm in size, the hydrogels held antibacterial properties for the presence of silver nanocomposites, is a prospective biology material.
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