中文摘要：

通过电纺纳米纤维自组装制备了含多磁性内核的Fe3O4@SiO2核壳结构纳米粒。采用扫描电镜（SEM）表征了电纺纳米纤维的形貌，利用场发射扫描电镜（FE-SEM）、透射电镜（TEM）、傅里叶红外光谱仪（FT-IR）、X晶体衍射仪（XRD）和振动样品磁强计（VSM）分别对纳米粒的形貌、粒度分布、物相组成、化学成分和磁性能等进行了表征。结果显示：采用电纺纳米纤维自组装制备的Fe3O4@SiO2纳米粒为近似球形的结构，其内含有多个磁性内核；粒径分布在50nm左右，主要物相是无定形的SiO2和晶态的Fe3O4，保持了磁性粒子的超顺磁性，是一种优良的生物磁性材料。

英文摘要：

The self-assembled Fe3O4@SiO2 composite nanoparticles with multi-magnetic cores were prepared from electrospun nanofibers. The morphology of electrospun nanofibers was observed by SEM. The appearance, size distribution, phase, chemical composition and magnetic characteristics of nanoparticles were characterized by FE- SEM, TEM, FT-IR, XRD and VSM, respectively. The results showed that the composite nanopartictes were in a sphere-like form. And there were many magnetic cores inside them. The size distribution of the microspheres averaged about 50 nm and the main phase of microspheres were amporphous SiO2 and crystalline Fe3O4. The composite nanoparticles retained superparamagnetic behavior and could be used as biomaterials.