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Synthesis and Magnetic Properties of Nearly Monodisperse CoFe2O4Nanoparticles Through a Simple Hydrothermal Condition

Xing-Hua Li1, Cai-Ling Xu12, Xiang-Hua Han1, Liang Qiao1, Tao Wang1* and Fa-Shen Li1*

Author Affiliations

1 Institute of Applied Magnetics, Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, 730000, Lanzhou, People’s Republic of China

2 Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University, 730000, Lanzhou, People’s Republic of China

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Nanoscale Research Letters 2010, 5:1039-1044  doi:10.1007/s11671-010-9599-9

Published: 16 April 2010


Nearly monodisperse cobalt ferrite (CoFe2O4) nanoparticles without any size-selection process have been prepared through an alluring method in an oleylamine/ethanol/water system. Well-defined nanospheres with an average size of 5.5 nm have been synthesized using metal chloride as the law materials and oleic amine as the capping agent, through a general liquid–solid-solution (LSS) process. Magnetic measurement indicates that the particles exhibit a very high coercivity at 10 K and perform superparamagnetism at room temperature which is further illuminated by ZFC/FC curves. These superparamagnetic cobalt ferrite nanomaterials are considered to have potential application in the fields of biomedicine. The synthesis method is possible to be a general approach for the preparation of other pure binary and ternary compounds.

Monodisperse; Cobalt ferrite; Superparamagnetic; Nanoparticles; Magnetic; Biomedcine