在3-氨丙基三乙氧基硅烷(APTES)功能化修饰后的Fe3O4纳米粒子溶液体系中,加入乙酸银使游离态银离子充分吸附在磁粒的表面,与氨基化基团形成配位化合物,再利用甲酸钠将配位银离子还原为银,制成磁性Fe3O4/Ag复合纳米粒子.采用紫外吸收可见光谱(UV-Vis)、电子能谱仪(EDS)、透射电子显微镜(TEM)和超导量子干涉仪(SQUID)等方法对复合粒子的形态、结构、组成以及磁学性质进行表征.同时,采用大肠杆菌和金黄色葡萄球菌对磁性Fe3O4/Ag复合纳米粒子的抗菌性能进行研究.结果表明:合成的复合粒子平均粒径为30 nm,室温下磁化强度为2.0 (ABELm2)/kg;磁性Fe3O4/Ag复合纳米粒子对大肠杆菌和金黄色葡萄球菌具有显著地抑制效果,指定实验条件下在24 h后两种细菌的存活量在0.11×103 (CFU)以下,进一步提高磁性Fe3O4/Ag复合纳米粒子用量,大肠杆菌存活量几乎100％减灭.本研究方法为制备具有外场响应功能(如磁场响应)的新型纳米生物抗菌材料提供了很好的范例.
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