磁性Fe_3O_4纳米粒子的合成及表征

The Hydrolytic Synthesis and Characterization of Nano-sized Magnetic Fe_3O_4 Particles

纳米Fe3O4是一种多功能磁性材料。用水解法制备Fe3O4纳米颗粒,产物特性的主要影响因素有熟化温度﹑Fe2+与Fe3+的摩尔比和滴定终点的pH值。用正交实验确定适宜的工艺条件,Fe2+与Fe3+的摩尔比为1∶1.75,恒温熟化温度为80℃,滴定终点的pH值=11,在此条件下可合成粒径分布在0.1μm以下占95.53%磁性Fe3O4纳米粉体。采用X射线衍射仪(XRD)、透射电镜(TEM)及振动样品磁强计(VSM)对优化实验产物的分析表明,所制备的纳米粒子属单相立方晶型,平均粒径为56nm,纯度高,具有超顺磁性。

Nanometer Fe3O4 is a kind of important multifunctional magnetic material. Nano-sized magnetic Fe3O4 particles was synthesized by hydrolytic method. The key influencing factors of property includs reaction temperature, molar ratio of Fe^3＋ to Fe^2＋ and the pH value of titrating termination.The orthogonal experiment showed the best experimental conditions： n （Fe^3＋）/n （Fe^2＋）=1.75, pH=11 and T=80℃. In this condition, the produced nano-sized magnetic Fe3O4 particles was characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM） and vibrating sample magnetometer （VSM）. The results showed that Fe3O4 nanocrystal of single-phase cubic structure with high purity, superparamagnetic and average grain size under 56nm could be obtained. The particles below 0.1 micron account 95.53%.