一种新型氨基磁性微球的制备及表征

Preparation and Characterization of a Novel Amino Magnetic Microsphere

采用化学共沉淀法制备油酸包被的Fe3O4纳米粒子,以此Fe3O4纳米粒子为核,采用分散聚合法合成了表面带有氨基功能基团的磁性微球。利用透射电镜(TEM)、X射线衍射仪(XRD)、振动样品磁强计(VSM)和傅里叶变换红外光谱仪(FT-IR)对两种磁性微球进行了表征,并采用电位滴定法测定了微球表面的氨基含量。结果表明,微球粒径均匀,为10 nm左右,具有超顺磁性,饱和磁化强度约为50 emu/g,氨基基团含量达486μmol/g。

The oleic acid coated Fe_3O_4 nanoparticles were prepared by chemical coprecipitation method,and then amino magnetic microspheres were synthesized based on the former nanoparticles by dispersion polymerization.Both of the nanoparticles and magnetic microspheres were characterized by means of transmission electron microscope（TEM）,X-ray diffractometer（XRD）,vibrating sample magnetometer（VSM） and Fourier transform infrared spectrometer（FT-IR）.Electrometric titration was applied to determine the contents of surface amino group.The results showed that the diameter of microspheres was about 10 nm,saturation magnetization was 50 emu/g approximately,and the surface amino group contents reached 486 μmol/g.The amino magnetic microspheres possessed uniform diameter and superparamagnetism,which could be applied on many domains,such as biomedicine,environmental protection and so on.