环境友好型水基四氧化三铁磁流体的制备与表征

在超声辅助无惰性气体保护的条件下,采用氧化共沉淀和化学共沉淀相结合的方法成功制备了四氧化三铁纳米粒子。通过XRD、FTIR、SEM和TEM等对其进行表征,结果表明,制备的四氧化三铁纳米粒子具有较好的晶形结构,粒径约为7 nm。通过正交实验证明了超声时间是影响四氧化三铁纳米粒子粒径的主要因素;而Fe2+与Fe3+的摩尔比是影响四氧化三铁纳米粒子粒径的次要因素。用柠檬酸对四氧化三铁进行表面改性,制备了环境友好型水基磁流体;磁性结果显示,其矫顽力及剩磁均很低,表现出较好的超顺磁性。

Preparation and characterization of environmental friendly water-based Fe3O4 magnetic fluid

In the conditions of ultrasonic auxiliary and no inert gas protection, Fe3O4 nanoparticles were prepared successfully by the combination of oxidation-coprecipitation method and chemical coprecipitation method, and were characterized by XRD, FT-IR and SEM. The results show that the Fe3O4 nanoparticles have a better crystal structure, and the particle size is about 7nm. Orthogonal experiments prove that ultrasonic time is the main factor that affects the particle size of Fe3O4 nanoparticles, and the molar ratio of Fe2 to Fe3 is the secondary factor. Water-based magnetic fluid was prepared through the surface modification of Fe3O4 nanoparticles by citric acid. The magnetization curve indicates that its coercivity and remanent magnetization are low, and shows good superparamagnetism.