Synthesis and characterization of monodisperse silica colloids loaded with superparamagnetic iron oxide nanoparticles

被引：113

作者：

Im, SH ^{[1
]}

Herricks, T ^{[1
]}

Lee, YT ^{[1
]}

Xia, YN ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

来源：

CHEMICAL PHYSICS LETTERS | 2005年 / 401卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.cplett.2004.11.028

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Silica colloids embedded with superparamagnetic iron oxide nanoparticles were synthesized by combining commercial ferrofluids with the well-known Stober process. In a typical procedure, organophilic iron oxide nanoparticles were extracted from a ferrofluid and redispersed in toluene. The suspension was then added to an alcoholic medium to produce emulsion drops consisting of aggregates of iron oxide nanoparticles and toluene. When tetraethylorthosilicate was introduced into the system, it hydrolyzed and formed silica coating around each emulsion drop. The final size of silica colloids depended on the concentration of iron oxide nanoparticles and the type of solvent used for the Stober synthesis. Larger colloids were obtained at lower concentrations of iron oxide nanoparticles and in alcohols with higher molecular weights. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：19 / 23

页数：5

共 23 条

[1] Semiconductor clusters, nanocrystals, and quantum dots [J].