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Journal of Nanomaterials
Volume 2014, Article ID 740856, 5 pages
Research Article

Synthesis of Monodisperse Iron Oxide Nanoparticles without Surfactants

1School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2China Coal Research Institute, Beijing 100013, China
3Hunan Boyun-Dongfang Powder Metallurgy Co., Ltd., Changsha, Hunan 410205, China

Received 6 August 2014; Accepted 8 October 2014; Published 22 December 2014

Academic Editor: Amir Kajbafvala

Copyright © 2014 Xiao-Chen Yang 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.


Monodisperse iron oxide nanoparticles could be successfully synthesized with two kinds of precipitants through a precipitation method. As-prepared nanoparticles in the size around 10 nm with regular spherical-like shape were achieved by adjusting pH values. NaOH and NH3H2O were used as two precipitants for comparison. The average size of nanoparticles with NH3H2O precipitant got smaller and represented better dispersibility, while nanoparticles with NaOH precipitant represented better magnetic property. This work provided a simple method without using any organic solvents, organic metal salts, or surfactants which could easily obtain monodisperse nanoparticles with tunable morphology.