Development of high magnetization Fe3O4/polystyrene/silica nanospheres via combined miniemulsion/emulsion polymerization

被引：306

作者：

Xu, Hong ^{[1
]}

Cui, Longlan ^{[1
]}

Tong, Naihu ^{[1
]}

Gu, Hongchen ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Natl Key Lab Nano Micro Fabricat Technol, Res Inst Micro Nano Sci & Technol, Shanghai 200030, Peoples R China

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2006年 / 128卷 / 49期

关键词：

D O I：

10.1021/ja066165a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Monodispersed, hydrophilic, superparamagnetic magnetic nanospheres with a high fraction of magnetite were synthesized by combining modified miniemulsion/emulsion polymerization and sol-gel technique for the first time. The surface of the nanospheres was coated by a silica layer with controlled thickness. Transmission electron microscopy experimental results showed well-proportioned, equal-sized, magnetite/polystyrene (Fe3O4/PS) nanospheres with a thin silica shell. Based on the TGA data, the fraction of magnetite in the Fe3O4/PS nanospheres core was estimated to be 80 wt %. Magnetization measurements indicated that the superparamagnetic nature of the nanospheres had high saturation magnetization of 40 emu/g at 300 K. The procedures of the novel synthesis are described in detail. Also discussed are the mechanisms of the novel combined miniemulsion/emulsion polymerization processes. Copyright © 2006 American Chemical Society.

引用

页码：15582 / 15583

页数：2

共 27 条

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