表面修饰对镝铁氧体纳米磁粒子的合成及其磁性能的影响

Effect of Surface Modification on Formation and Magnetic Property of Dysprosium Ferrite Nanomagnetic Particles

利用湿化学法制备镝铁氧体纳米磁粒子时,用适量的阴离子表面活性剂进行表面修饰,能够有效地控制磁粒子的粒径,同时避免干燥时产生硬团聚。文章介绍了用月桂酸、月桂酸钠、正十二烷基硫酸钠对磁粒子进行表面修饰的研究结果,探讨了三者及其用量对磁粒子的形成及磁性能的影响。借助X射线衍射仪(XRD)、透射电镜(TEM)、振动样品磁强计(VSM)、红外光谱仪(IR)对产物的性能进行了表征。结果表明,用月桂酸修饰后的产物具有Fe3O4磁粒子的晶型结构且结晶度高、磁性能优异、平均粒径约16nm;用月桂酸钠、正十二烷基硫酸钠修饰后的产物不具有Fe3O4磁粒子的晶型结构,结晶度低且磁性能差。

When wet chemical method are use to prepare dysprosium-doped ferrite magnetic nanoparticles,right amount of anionic surfactant were doped as surface modification,which can effectively control the size of magnetic particles,and avoid producing hard reunion when dry out.This paper introduces the research results of magnetic particle surface modification by using lauric acid,laurel acid sodium and lauryl sodium sulfate,discusses the effect of lauric acid,laurel acid sodium and lauryl sodium sulfate and their dosages on the formation of magnetic and its magnetic property.The properties of the product can be characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）,vibrating sample magnetometer（VSM）,infrared spectrometer（IR）.The results showed that the product modified with lauric acid have a crystalline structure of Fe3O4 magnetic particles and high crystallinity,excellent magnetic properties.The average particle size is about 16 nm;the product modified with laurel acid sodium and lauryl sodium sulfate does not have the crystalline structure of Fe3O4 magnetic particles,with low crystallinity and low magnetic property.