Fe_3O_4磁性纳米粒子的共沉淀法制备研究

叙述了以液相共沉淀法制备纳米磁性Fe3O4粒子的工艺,研究了反应搅拌速度、n(Fe3+)/n(Fe2+)的比例、pH值和熟化温度对制备纳米Fe3O4粒子的影响,并利用透射电镜表征观察Fe3O4纳米粒子的形貌。研究结果表明,在搅拌速度较快的情况下制备纳米级Fe3O4颗粒的最佳合成工艺条件为:n(Fe3+)/n(Fe2+)为1.8∶1(摩尔比),熟化温度70℃,熟化时间30 min,以氨水作沉淀剂最佳pH值是9左右,可制得纯度较高,粒径小于10 nmFe3O4磁性粒子。

Study on preparation of magnetic Fe3O4 nano-particles with liquid-state co-precipitation method

The process of liquid-state co-precipitation method was studied in preparing nanometer magnetic Fe3O4.The effect of the stirring speed,the ratio of Fe3+/Fe2+ on the grain size,pH and the curing temperature on the preparing of magnetic Fe3O4 nano-particles were investigated.The morphology of Fe3O4 nanoparticles were studied with TEM.The result showed that the optimum technical process conditions are as follows:n(Fe3+)/n(Fe2+) is 1.8,the reaction temperature is 70 ℃,the reaction time is 30 min,pH is about 9 in the presence of ammonia as precipitant,under this condition the product is prepared successfully,which purity is higher,average grain size is less than 10 nm.