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Journal of Nanomaterials
Volume 2012, Article ID 607296, 6 pages
http://dx.doi.org/10.1155/2012/607296
Research Article

Synthesis and Properties of MPEG-Coated Superparamagnetic Magnetite Nanoparticles

1College of Science, Guilin University of Technology, Guilin 541004, China
2State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China

Received 29 July 2012; Accepted 24 August 2012

Academic Editor: Mao-Wang Lu

Copyright © 2012 Xueli Cao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The magnetite nanoparticles were synthesized by the thermal decomposition of iron(III) acetylacetonate in methoxy polyethylene glycol, which was used as solvent, reducing agent, and modifying agent in the reaction. The morphologies and phase compositions of the nanoparticles were determined by transmission electron microscopy and X-ray diffraction, respectively. The surface coating of the nanoparticles was recognized using Fourier transform infrared spectroscopy. Magnetic properties were measured using superconducting quantum interference device. The zeta potential and hydrodynamic size of the nanoparticles was determined using nanoparticle and zeta potential analyzer. The magnetite nanoparticles show superparamagnetic behavior in 300 K. The negatively charged methoxy polyethylene glycol-coated magnetite nanoparticles in water exhibited longer-time dispersion with small hydrodynamic size than the magnetite nanoparticles synthesized by the thermal decomposition of iron(III) acetylacetonate in polyethylene glycol. The less conjunction between methoxy polyethylene glycol-coated magnetite nanoparticles due to the inert –CH3 terminal group may cause their higher stability in water dispersion.