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氧化硅包裹四氧化三铁微球的制备及表征

Preparation and Characterization of Silica-coated Fe₃O₄ Nanoparticles

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【Author】 JIANG Lin, GAO Feng, HE Rong, CUI Da-xiang(Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, National Key Lab. of Micro/Nano Fabrication Technology, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, China)

【机构】上海交通大学微纳科学技术研究院,薄膜与微细技术教育部重点实验室,微米/纳米加工技术国家级重点实验室；

【摘要】在室温下,采用H2O2氧化Fe(OH)2悬浮液的方法制备得到了粒径23nm左右的磁性纳米粒子,经X射线衍射检测制备得到的是Fe3O4磁性纳米粒子,粒子的饱和磁化强度为59.05emu/g。先用硅烷偶联剂KH560修饰Fe3O4,提高粒子在乙醇溶液中的单分散性,在此基础上采用溶胶凝胶法通过TEOS水解制备得到分散性佳、尺寸均匀、粒径为25nm左右核壳结构的氧化硅包覆Fe3O4纳米粒子的磁微球。更多还原

【Abstract】 Fe₃O₄ nanoparticles were synthesized from an aqueous Fe（OH）₂ suspension by oxidizing with H₂O₂ at 25℃. The nanoparticles are characterized through X-Ray Diffraction, the Vibrating Sample Magnetometer （VSM） and transmission electron microscope （TEM）. The results show the average diameter of 23nm and the saturation magnetization of 59.06emu/g. The Fe₃O₄ nanoparticles first modified by KH560 to enhance the monodispersity in C₂H₅OH, and then treated with TEOS to prepare the Fe₃O₄/SiO₂ core/shell composite nanoparticles which were well dispersed and with uniform size around 25nm.更多还原