Colloidal dispersions of monodisperse magnetite nanoparticles modified with poly(ethylene glycol)

被引：120

作者：

Barrera, Carola

Herrera, Adriana P.

Rinaldi, Carlos ^{[1
]}

机构：

[1] Univ Puerto Rico, Dept Chem Engn, Mayaguez, PR 00680 USA

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2009年 / 329卷 / 01期

基金：

美国国家科学基金会;

关键词：

Magnetite; Thermal decomposition; PEG; PFG-silane; APS; Steric stabilization; SURFACE MODIFICATION; THEORETICAL-ANALYSIS; DEXTRAN CHAINS; SEPARATION; CONFORMATION; PARTICLES; STABILITY; CARRIERS; COMPLEX; SILANE;

D O I：

10.1016/j.jcis.2008.09.071

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：

Monodisperse magnetite nanoparticles modified with poly(ethylene glycol) (PEG) were synthesized using a silane functionalized PEG obtained by reacting 3-aminopropyl triethoxysilane with carboxylic acid-methoxy PEG (mPEG-COOH) Using amide reactions. Transmission electron microscopy (TEM) dynamic, light scattering (DLS), and zeta potential measurements show the particles are monodisperse (sigma(gv) similar to 0.2) and stable in water for pH of 3-9 and ionic strengths, up to 0.3 M NaCl. Thermogravimetric analysis Coupled with TEM and DLS indicates formation of a dense graft layer oil the particle surface. An analysis of the interparticle interaction energy indicates that the particles are stabilized by strong steric repulsions between PEG chains on their surface. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：107 / 113

页数：7

共 55 条

[1] Magnetite-loaded polymeric micelles as ultrasensitive magnetic-resonance probes [J].