Synthesis of n-Hexadecylphosphonic Acid-coated Monodisperse Fe3O4 Superparamagnetic Nanoparticles
Monodisperse Fe3O4 superparamagnetic nanoparticles were synthesized in n-Hexadecylphosphonic acid/cyclohexane/water/ethanol microemulsion under solvothermal conditions at 100℃.The crystal structure and particle size of synthesized Fe3O4 were observed by X-ray diffraction as well as transmission electron microscopy.The results show that the nanoparticles have a cubic crystal system and an average particle size of about l0 nm.Each nanoparticle has a single crystal structure.The surface chemistry of synthesized Fe3O4 nanoparticles was characterized by Fourier transform infrared spectroscopy,indicating that the nanoparticles were covered by a layer of n-Hexadecylphosphonic acid,which made the nanoparticles totally lipophilic.Magnetic properties of the nanoparticles were investigated by using VSM (Vibrating sample magnetometer).The results reveal that the Ms (saturation magnetization) of the nanoparticles is higher than 40 emu/g and the coercive force is near to 0.The monodisperse Fe3O4 nanoparticles have superparamagnetic property and may find potential applications in many fields such as ferrofluids,drug loading and release,selective biomolecular separation and MRI.
Superparamagnetic Magnetite Phosphonic acid
Xuesong Tang Ming Li
Department of Materials Science and Engineering,and State Key Laboratory of New Ceramics and Fine Processing,Tsinghua University,Beijing 100084,Peoples Republic of China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
170-173
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）