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中文摘要：
首先采用次磷酸钠液相还原方法制备了纳米银溶胶;再以正硅酸乙酯为硅源,十六烷基三甲基溴化铵为模板剂,采用溶胶-凝胶法,在制备的纳米银溶胶中的银颗粒表面原位生长二氧化硅球壳;然后利用溶剂萃取法去除有机模板剂,再经超临界干燥后制备出介孔二氧化硅包覆银纳米颗粒（Ag@mSiO2）。对所得样品进行了TEM、SEM、XRD、FT-IR、N2吸附/脱附等表征,结果表明此纳米复合粒子的介孔结构有序性良好、比表面积大、呈连接的球状形貌。进一步以二倍稀释法测试了Ag@mSiO2纳米颗粒对大肠杆菌和金色葡萄球菌的最小抑菌质量浓度（均为156μg/mL）和最小杀菌质量浓度（312.5和625μg/mL）,结果表明Ag@mSiO2纳米颗粒有良好的抗菌效果。
英文摘要：
A silver sol has been synthesized by a chemical reduction method using polyvinylpyrrolidone as the protecting agent and sodium hypophosphite as the reducing agent. By adding hexadecyltrimethylammonium bromide （CTAB） as template and tetraethyl orthosilicate （TEOS） as silica source into the above silver sol,silica shells were grown in situ on the silver nanoparticles to form core-shell structured Ag@mSiO2 nanocomposites. The CTAB template was then removed by solvent extraction and the Ag@mSiO2 nanocomposites were dried by supercritical fluid drying. TEM,SEM,XRD,FT-IR and N2 adsorption-desorption isotherm measurements indicated that the resulting Ag@mSiO2 nanoparticles were interconnected spheres with an ordered mesoporous structure and a very high BET surface area. The antibacterial performances of Ag@mSiO2 nanoparticles against Escherichia coli （E. coli） and Staphylococcus aureus （S. aureus） were tested using the popular twofold serial dilution method to obtain the minimal inhibitory concentration （MIC） and minimal bactericidal concentration （MBC）,respectively. The results demonstrated that the Ag@mSiO2 nanoparticles possess good antibacterial properties.
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