Synthesis of Nonspherical Superparamagnetic Particles: In Situ Coprecipitation of Magnetic Nanoparticles in Microgels Prepared by Stop-Flow Lithography

被引：111

作者：

Suh, Su Kyung ^{[1
]}

Yuet, Kai ^{[1
]}

Hwang, Dae Kun ^{[1
]}

Bong, Ki Wan ^{[1
]}

Doyle, Patrick S. ^{[1
]}

Hatton, T. Alan ^{[1
]}

机构：

[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 17期

基金：

美国国家科学基金会;

关键词：

MICROPARTICLES; NANOCRYSTALS; SEPARATION; CLUSTERS; METAL;

D O I：

10.1021/ja209245v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present the synthesis of nonspherical magnetic microparticles with multiple functionalities, shapes, and chemistries. Particle synthesis was performed in two steps: polymeric microparticles functionalized homogenously with carboxyl groups were generated using stop-flow lithography, and then in situ coprecipitation was used to grow magnetic nanoparticles at these carboxyl sites. With successive growth of magnetic nanoparticles, we obtained polymeric particles with saturation magnetizations of up to 42 emu/g microparticle. The growth in the magnetic nanoparticle mean size and polydispersity was determined from the magnetization curves obtained following each growth cycle; nanoparticle sizes were limited by the physical constraint of the effective mesh within the hosting gel microparticle. Particles with spatially segregated domains of varying magnetic properties (e.g., Janus particles, particles with step changes in magnetite concentration, etc.) can be synthesized readily using this approach.

引用

页码：7337 / 7343

页数：7

共 42 条

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