液相共沉淀法制备四氧化三铁纳米粉

采用液相共沉淀法制备了纳米级四氧化三铁颗粒，通过X-Ray谱图证实了该粒子的组成结构。通过能谱图(EDS)研究表明样品中含有氯元素，这是因为在纳米级四氧化三铁颗粒表面处理过程中，其表面层与盐酸反应，表面生成氢氧化铁带电颗粒，Cl^-吸附在该颗粒表面，从而有效防止纳米粒子团聚，提高其分散效果。通过HRTEM研究表明，由该法所制得的四氧化三铁粒子主要为球形，粒径分布均匀，平均粒径在10nm左右。

Preparation of Fe3O4 nanoparticle by liquid- phase coprecipitation

The preparation of Fe_3O_4 nanoparticle by liquid-phase coprecipitation is introduced.The phase structure of the particle is measured by XRD.EDS shows that there is chlorine element in the particle.Because in the process of reaction the Fe_3O_4 nanoparticles in the surface react with HCl to form Fe(OH)_3 particle with electricity.Cl~(- ) is adsorbed in the surface of Fe_3O_4 nanoparticle,so that the agglomeration of nanoparticle can be prevented and the dispersive effect can be improved.The Fe_3O_4 nanoparticle is spherical and the size of particle is uniform and the average size is about 10 nm by TEM test.