【摘 要】
：
Physical and chemical properties of the magnetic nanoparticles coated with oleate have been investigated by means of transmission electron microscopy (TEM), the
【机 构】
：
Department of Physics and State Key Lab. Of Laser Technology,The International Center of Materials P
【基金项目】
：
国家高技术研究发展计划(863计划);the National Natural Scicnce Foundation of China through
论文部分内容阅读
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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