Characterization and application of Fe3O4/SiO2 nanocomposites

被引：154

作者：

Du, G. H. ^{[1
]}

Liu, Z. L.

Xia, X.

Chu, Q.

Zhang, S. M.

机构：

[1] Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Tongji Hosp, Wuhan 430074, Peoples R China

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2006年 / 39卷 / 03期

基金：

中国国家自然科学基金;

关键词：

sol-gel method; Fe3O4/SiO2; nanocomposites; superparamagnetic; application in biomedical field;

D O I：

10.1007/s10971-006-7780-5

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A sol-gel procedure was used to cover Fe3O4 nanoparticles with SiO2 shell, forming a core/shell structure. The core/shell nanocomposites were synthesized by a two-step process. First, Fe3O4 nanoparticles were obtained through co-precipitation and dispersed in aqueous solution through electrostatic interactions in the presence of tetramethylammonium hydroxide (TMAOH). In the second step, Fe3O4 was capped with SiO2 generated from the hydrolyzation of tetraethyl orthosilicate (TEOS). The structure and properties of the formed Fe3O4/SiO2 nanocomposites were characterized and the results indicate that the Fe3O4/SiO2 nanocomposites are superparamagnetic and are about 30 nm in size. Bioconjugation to IgG was also studied. Finally, the mechanism of depositing SiO2 on magnetic nanoparticles was discussed.

引用

页码：285 / 291

页数：7

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