受控部分还原法制备Fe3O4纳米粒子及其性能研究

采用受控部分还原法(CPRM)制备Fe3O4纳米粒子。由于反应乳液中的大分子表面活性剂限制了成核和核的生长过程,使得纳米粒子的粒径分布很好,且系统中纳米粒子的含量较微乳液法有明显提高。改变反应物浓度可使反应系统中的Fe2 稍过量,故采用CPRM时,反应系统无须惰性气体保护,合成的Fe3O4纳米粒子经TEM、X-ray、动态光散射和振动磁强计等进行表征,结果表明Fe3O4磁性粒子的平均粒径为16 nm,且粒径分布窄,具有极好的超顺磁性。CPRM法使得在一般条件下合成高质量的纳米粒子和Fe3O4磁流体成为可能。

Study on Preparation and Properties of Fe3O4 Nanoparticles with a Controlled Partial Reduction Method

Fe_3O_4 nanoparticles were synthesized by a controlled partial reduction method(CPRM).The synthesized nanoparticles are almost monodispered because the presence of the macromolecular surfactants in the emulsion limits the nucleation and the nucles growth.Compared with microemulsion method,the much higher concentration of reactants increases the quantity of Fe_3O_4 nanoparticle.Altering the concentration of the reducer can provide lightly excessive ferrous ion in the reaction,this made the inert atmosphere unnecessary.The transmission electron microscopy,X-ray diffraction,dynamic light scattering and vibrating sample magnetometer were used to characterize the nanoparticles.The results show the synthesized Fe_3O_4 nanoparticles are in average diameter 16 nm with narrow size distribution and superparamagnetism.The CPRM makes it possible to synthesize high quality nanoparticles and magnetic fluids in the common conditions.