论文部分内容阅读
采用原位法和液相化学还原法制备了Ag/低分子量壳聚糖(LMWC)和Ag/LMWC-聚吡咯(PPy)复合胶乳,分析了各种工艺条件对复合胶乳中纳米Ag粒子粒径及粒度分布的影响规律,并确定了复合胶乳较适宜的合成条件。采用UV-Vis、TEM、FTIR及XRD对复合胶乳的组成和纳米Ag的形态进行了表征。结果显示:Ag/LMWC和Ag/LMWC-PPy复合胶乳中的纳米Ag晶体为面心立方结构,平均粒径约为10~20nm。抗菌测试结果表明:LMWC(黏均分子量珨Mη=4.3×105)的抗菌效果优于未降解的原始壳聚糖(CS),由于纳米Ag的引入,Ag/LMWC和Ag/LMWC-PPy复合胶乳对大肠杆菌和金黄色葡萄球菌与单一的LMWC相比均具有较高的抑菌活性。
The Ag / LMWC and Ag / LMWC-PPy composite latexes were prepared by in situ and liquid phase chemical reduction methods. The effects of various process conditions on the particle size of Ag nanoparticles, And particle size distribution of the impact of law, and determine the more suitable composite latex synthesis conditions. The composition of composite latex and the morphology of nano-Ag were characterized by UV-Vis, TEM, FTIR and XRD. The results show that the nano-Ag crystals in Ag / LMWC and Ag / LMWC-PPy composite latexes have a face-centered cubic structure with an average particle size of about 10-20 nm. The results of antibacterial test showed that the antibacterial activity of LMWC (Mη = 4.3 × 105) was better than that of non-degraded raw chitosan (CS). The Ag / LMWC and Ag / LMWC- Escherichia coli and Staphylococcus aureus with a single LMWC compared with high antibacterial activity.