中文摘要：

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。

英文摘要：

Nanocrystalline cellulose/silver nanoparticles was preparedby chemical reduction method with nano- crystalline cellulose（NCC） as dispersing agent, sodium borohydride as reductant of silver nitrate. For NCC/sil- ver nanoparticles prepared with 5wt% of rn （Ag）/rn （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 sil- ver 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.