Structural and Magnetic Analyses of Magnetic Nanoparticles Coated with Oleate Molecules

材料科学技术（英文）, 2004, 20(4): 417-420.

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1.Department of Physics and State Key Lab. Of Laser Technology, Huazhong University of Science and Technology(HUST), Wuhan 430074, China;The International Center of Materials Physics, Chinese Academic of Science, Shenyang 110016, China

2.Department of Physics and State Key Lab. Of Laser Technology, Huazhong University of Science and Technology(HUST), Wuhan 430074, China

3.Department of Physics and State Key Lab. Of Laser Technology, Huazhong University of Science and Technology(HUST), Wuhan 430074, China

4.Department of Physics and State Key Lab. Of Laser Technology, Huazhong University of Science and Technology(HUST), Wuhan 430074, China

5.Tongji Hospital, Huazhong University of Science and Technology(HUST), Wuhan 430074, China

6.Tongji Hospital, Huazhong University of Science and Technology(HUST), Wuhan 430074, China

7.Tongji Hospital, Huazhong University of Science and Technology(HUST), Wuhan 430074, China

基金项目: the National Natural Scicnce Foundation of China through(20490210) 国家高技术研究发展计划(863计划)(2002AA302202)

Structural and Magnetic Analyses of Magnetic Nanoparticles Coated with Oleate Molecules

Keywords： Magnetic nanoparticles

Physical and chemical properties of the magnetic nanoparticles coated with oleate have been investigated by means of transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Mossbauer spectroscopy, supercon ducting quantum interference device (SQUID) magnetometry, infrared spectra (IR) and the contact angle device.The results show that doped Al ions in Fe3O4 nanoparticles are located on the octahedral sites of the spinel struc ture. Oleate is coated on the magnetic nanoparticles with two layers by chemical absorbing, the outer layer can be washed away. The wetting of the surface of magnetic nanoparticles coated with monolayer has been changed from hydrophilicity to hydrophobicity, and the nanoparticles can be dispersed very well in some organic solutions.

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Structural and Magnetic Analyses of Magnetic Nanoparticles Coated with Oleate Molecules

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