title: Synthesis and characterization of biocompatible Fe3O4 nanoparticles.
abstract: In this study, magnetite (Fe3O4) nanoparticles with a size range of 8-20 nm were prepared by the modified controlled chemical coprecipitation method from the solution of ferrous/ferric mixed salt-solution in alkaline medium. In the process, two kinds of surfactant (sodium oleate and polyethylene glycol) were studied; then, sodium oleate was chosen as the apt surfactant to attain ultrafine, nearly spherical and well-dispersed (water-base) Fe3O4 nanoparticles, which had well magnetic properties. The size and size distribution of nanoparticles were determined by particle size analyzer. And the magnetite nanoparticles was characterized by X-ray powder diffraction (XRD) analysis, transmission electron microscopy (TEM), electron diffraction (ED) photography, Fourier transform infrared spectrometer (FT-IR), and vibrating-sample magnetometer (VSM). Also the effect of many parameters on the Fe3O4 nanoparticles was studied, such as reaction temperature, pH of the solution, stirring rate and concentration of sodium oleate. And the 5-dimethylthiazol-2-yl-2,5- diphenyltetrazolium bromide (MTT) assay was performed to evaluate the biocompatibility of magnetite nanoparticles. The results showed that the Fe3O4 nanoparticles coated by sodium oleate had a better biocompatibility, better magnetic properties, easier washing, lower cost, and better dispersion than the magnetite nanoparticles coated by PEG.
authors.affiliation: School of Materials Science and Engineering, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Shaobing
authors.initials: S
authors.lastname: Zhou
authors.forename: Peng
authors.initials: P
authors.lastname: Hou
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yang
authors.forename: Jie
authors.initials: J
authors.lastname: Weng
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Li
authors.forename: Mingyuan
authors.initials: M
authors.lastname: Li
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry*; D002460:Cell Line; D002470:Cell Survival; D011232:Chemical Precipitation; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D051379:Mice; D008854:Microscopy, Electron; D053758:Nanoparticles / Q000737:chemistry*; D019301:Oleic Acid; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D013501:Surface-Active Agents; D019301:Oleic Acid; C013173:osteum; D052203:Ferrosoferric Oxide