Synthesis and characterization of Fe_3O_4@SiO_2 magnetic composite nanoparticles by a one-pot process

查看全文 作　　者：Le [1]Zhang;Hui-ping [1]Shao;Hang [1]Zheng;Tao [1]Lin;Zhi-meng [1]Guo

机构地区：[1]Institute for Advanced Materials and Technology, University of Science and Technology Beijing

出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2016年第23卷第9期,共7页

基　　金：the National Natural Science Foundation of China (No.51274039);the State Key Lab of Advanced Metals and Materials (No.2013-ZD05);the Guangdong Foundation of Research (No.2014B090901003) 摘　　要：Fe_3O_4@SiO_2 core–shell composite nanoparticles were successfully prepared by a one-pot process. Tetraethyl-orthosilicate was used as a surfactant to synthesize Fe_3O_4@SiO_2 core–shell structures from prepared Fe_3O_4 nanoparticles. The properties of the Fe_3O_4 and Fe_3O_4@SiO_2 composite nanoparticles were studied by X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy. The prepared Fe_3O_4 particles were approximately 12 nm in size, and the thickness of the SiO_2 coating was approximately 4 nm. The magnetic properties were studied by vibrating sample magnetometry. The results show that the maximum saturation magnetization of the Fe_3O_4@SiO_2 powder(34.85 A·m2·kg–1) was markedly lower than that of the Fe_3O_4 powder(79.55 A·m2·kg–1), which demonstrates that Fe_3O_4 was successfully wrapped by SiO_2. The Fe_3O_4@SiO_2 composite nanoparticles have broad prospects in biomedical applications; thus, our next study will apply them in magnetic resonance imaging. 关键词：composite materials magnetite nanoparticles iron oxides silicon dioxide one-pot process

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Synthesis and characterization of Fe_3O_4@SiO_2 magnetic composite nanoparticles by a one-pot process

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