纳米纤维素/银纳米粒子的制备和表征

摘要

以纳米纤维素(NCC)为分散剂,硼氢化钠为还原剂还原硝酸银,化学还原法制备纳米纤维素/银纳米粒子.m(Ag)/m (NCC)=5％制备的纳米纤维素/银纳米粒子,X射线衍射分析结果表明,纳米纤维素/银纳米粒子中NCC和银纳米粒子相互混合并未改变各自的晶型,纳米纤维素/银纳米粒子中银纳米粒子的晶粒尺寸为11.87nm,与透射电子显微镜(TEM)所测银纳米粒子直径(10nm)相近；热重分析结果表明,纳米纤维素/银纳米粒子的热稳定性较纳米纤维素稍有下降.透射电子显微镜(TEM)分析、紫外光谱分析、固含量分析、机理分析和抑菌活性分析结果表明,m(Ag)/m (NCC)=3％时制备的纳米纤维素/银纳米粒子对大肠杆菌和金黄色葡萄球菌均有抑制作用,且银纳米粒子在纳米纤维素/银纳米粒子中分散较均匀.%Nanocrystalline cellulose/silver nanoparticles was prepared by chemical reduction method with nanocrystalline cellulose(NCC) as dispersing agent, sodium borohydride as reductant of silver nitrate. For NCC/silver nanoparticles prepared with 5wt% of m (Ag)/m (NCC), X-ray diffraction analysis showed that crystalline type of NCC and silver nanoparticles for NCC/silver nanoparticles did not change respectively. Grain size of silver nanoparticles of NCC/silver nanoparticles was 11. 87nm,which was similar to silver nanoparticles diameter (10nm) measured by transmission electron microscopy (TEM). Thermogravimetric analysis (TGA) results showed that thermal stability of NCC/silver nanoparticles decreased slightly compared with NCC. Transmission electron microscopy (TEM) analysis, UV-Vis absorption spectra analysis, solid content analysis, mechanism a-nalysis, and antibacterial activity analysis results showed that escherichia coli and staphylococcus aureus was separately inhibited by NCC/silver nanoparticles prepared with 3% of m (Ag)/m (NCC) and silver nanoparticles of NCC/silver nanoparticles were uniformly dispersed in NCC/silver nanoparticles.