J Mater Sci Technol ›› 2004, Vol. 20 ›› Issue (04): 417-420.

• Research Articles • Previous Articles     Next Articles

Structural and Magnetic Analyses of Magnetic Nanoparticles Coated with Oleate Molecules

Kailun YAO, Jin TAO, Zuli LIU, Qianghua LU, Dong XI, Xiaoping LUO, Qin NING   

  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
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-07-28 Published:2009-10-10
  • Contact: Kailun YAO

Abstract: Physical and chemical properties of the magnetic nanoparticles coated with oleate have been investigated by means of transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Mo¨ssbauer spectroscopy, superconducting 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 structure. 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.

Key words: Magnetic nanoparticles, Contact angle, Surfactant, Mo¨ssbauer spectroscopy