Journal
PARTICUOLOGY
Volume 9, Issue 2, Pages 179-186Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2010.07.025
Keywords
Iron oxides; Magnetic microparticles; Oriented attachment; Solvothermal method
Funding
- National Natural Science Foundation of China (NSFC) [20876100, 20736004]
- National Basic Research Program of China (973 Program) [2009CB219904]
- State Key Lab of Multiphase Complex Systems of the Chinese Academy of Sciences [2006-5]
- Key Lab of Organic Synthesis of Jiangsu Prov.
- R&D Foundation of Nanjing Medical Univ. [NY0586]
- Post-doctoral Science Foundation of Jiangsu Prov.
- National Post-doctoral Science Foundation [20090451176]
- Commission of Science and Technology of Suzhou Municipality [YJS0917, SG0978]
- Technology innovation Foundation of Suzhou New District and MOST
- Minjiang Scholarship of Fujian Prov.
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Ferromagnetic Fe3O4 nanoparticles were synthesized and then self-assembled into microparticles via a solvothermal method, using FeCl3-6H(2)O as the iron source, sodium oleate as the surfactant, and ethylene glycol as the reducing agent and solvent. The obtained Fe3O4 microparticles were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and vibrating sample magnetometer (VSM). The size and morphology of the particles were examined using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The Fe3O4 microparticles of nearly monodisperse diameters, controllable in the range of 120-400 nm, consist of assemblies of Fe3O4 nanoparticles with a diameter of 22 nm. The effects of reaction time, amount of surfactant and NaAc on the products were discussed. Interestingly, by using the pre-synthesized Fe3O4 microparticles as the growth substrates, spherical and smooth-looking Fe3O4 microparticles with average diameter of 1 mu m were obtained. A plausible formation process was discussed. (C) 2011 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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