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采用化学共沉淀法以柠檬酸三钠为表面改性剂制备了离子型稀土复合钴铁氧体磁流体.利用X衍射仪和透射电镜对磁粒子的组成、结构及粒径进行了分析.利用古埃磁天平和分光光度计研究了稀土离子改性对磁流体饱和磁化强度和磁感应的影响,实验结果表明:合成过程中添加稀土离子能明显降低磁性纳米粒子的粒径,制得的磁粒子均呈球形,钴铁氧体磁粒子的粒径为12～15nm,稀土钴铁氧体磁粒子的粒径为6～8nm.利用稀土改性的微观模型解释了粒径的降低.添加Dy3+能提高饱和磁化强度和磁感应,添加Y3+则能提高磁感应,却降低了饱和磁化强度.并从理论上对其改性机理进行了详细的分析.
The ion-type rare earth composite cobalt ferrite magnetic fluid was prepared by chemical coprecipitation method with trisodium citrate as surface modifier.The composition, structure and particle size of magnetic particles were analyzed by X-ray diffraction and transmission electron microscopy The effect of rare earth ion modification on the saturation magnetization and magnetic induction of the magnetic fluid was studied by the Gurgeon balance and spectrophotometer. The experimental results show that the addition of rare earth ions during the synthesis can significantly reduce the particle size of the magnetic nanoparticles. The magnetic particles The particle size of the cobalt ferrite magnetic particles is 12-15nm and the particle size of the rare earth cobalt ferrite magnetic particles is 6-8nm.The particle size reduction is explained by the microscopic model modified by rare earths.The addition of Dy3 + Improve the saturation magnetization and magnetic induction, add Y3 + can increase the magnetic induction, but reduce the saturation magnetization .And in theory, its modification mechanism was analyzed in detail.