摘要
采用化学共沉淀法制备了Fe3O4磁性纳米粒子。以油酸钠为基体的Fe3O4磁流体具有良好的分散效果。利用X衍射仪(XRD)和透射电镜(TEM)分别对磁性粒子的物相、结构及粒径进行了分析,证实其为纯相Fe3O4粒子且粒径约为8nm。采用振动样品磁强计(VSM)测得包覆油酸钠前后的Fe3O4粒子饱和磁化强度(Ms)分别为60.55emu/g和9.94emu/g,剩磁(Mr)和矫顽力(Hc)都很小,样品几乎没有磁滞现象,具有良好的超顺磁性。该磁流体在软磁材料Q235钢样品表面显示出了较为清晰的磁畴图像。
Fe3O4 magnetic nanoparticles are prepared by chemical co-precipitation. Sodium oleate-based Fe3O4 magnetic fluid had well-distributed. The sample phase structure and particle sizes are analysed by X-ray diffraction （XRD） and transmission electron microscopy（TEM）. The measurement results indicate that the prepared particles are pure Fe3O4 with an average particle size of about 8nm. The vibrating sample magnetometer（VSM） measured the saturation magnetization intensity（Ms ） of Fe3O4 particles before and after sodium oleate coated are 60. 55emu/g and 9.94 emu/g, respectively. Magnetic-rheological（Mr） and coercive force（He） are small, almost having no hysteresis phenomenon, so it is good super paramagnetic. The surface of magnetically soft material Q235 steel samples show clear magnetic domain structure image with the magnetic fluid.
基金
十一五国家科技支撑计划(2006BAK02B02)
关键词
化学共沉淀法
Fe3O4磁流体
超顺磁性
Q235
磁畴
chemical co-precipitation, Fe3O4 magnetic fluid, super paramagnetic, Q235, magnetic domain
