Citation: YAN ng-Qin, WANG Wei, SUN Zhi-Gang, GUAN Jian-Guo. Magnetite Sub-Microspheres with Controlled Diameter and Magnetic Properties Synthesized by the Citrate-Assisted Polyol Process[J]. Acta Physico-Chimica Sinica, ;2010, 26(11): 3120-3126. doi: 10.3866/PKU.WHXB20101027 shu

Magnetite Sub-Microspheres with Controlled Diameter and Magnetic Properties Synthesized by the Citrate-Assisted Polyol Process

1.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China

Received Date: 7 May 2010
Available Online: 14 September 2010
Fund Project: 国家高技术研究发展计划(863)项目（2006AA032461) (863)项目（2006AA032461)霍英东基金项目(101049)资助 (101049)

Monodispersed superparamagnetic magnetite (Fe₃O₄) sub-microspheres with controlled grain sizes and diameters were obtained by a facile polyol solvothermal method using sodium citrate as an additive. The results show that citric ions, which strongly coordinate with iron atoms on the surface of magnetite, can be effectively adsorbed onto the surface of Fe₃O₄ nanoparticles. Therefore, the growth of the initially formed Fe₃O₄ nanoparticles is restrained and the electrostatic repulsive force changes. Consequently, both the diameter and the magnetic properties of the resultant Fe₃O₄ sub-microspheres can be easily tuned over a relative large range. Simply changing the concentration of citric or ferric ions can change both the diameter of the Fe₃O₄ nanoparticles which construct the resultant sub-microspheres as building blocks and that of the resultant sub-microspheres in a range of 220 -550 nm, resulting in monodispersed superparamagnetic magnetite sub-microspheres.
- Superparamagnetism,
- Monodispersed sub-microspheres,
- Magnetite,
- Diameter control,
- Citrate
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