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中文摘要：
采用溶胶-凝胶法、酸碱两步催化法和乳液成球法制备单分散核壳结构的SiO2磁性微球，利用Leitz光学显微镜、场发射扫描电镜、X射线衍射仪、能谱仪和振动样品磁强计分别对微球的形貌、粒度分布、物相组成、化学成分和磁性能进行了表征。结果显示：采用酸碱二步催化乳液成球法制备的SiO2磁性微球显示出良好的核壳结构，粒径分布在20μm左右，主要物相是无定形的SiO2和尖晶石型的Fe3O4，保持了Fe3O4磁性粒子的超顺磁性，是一种优异的生物磁性材料。
英文摘要：
Monodisperse core-shell SiO2 magnetic microspheres were synthesized by sol- gel method, acid- alkali two-step catalyzing and gelling in emulsion. Leitz optical microscopy, field emission scanning electron microscopy, X-ray diffraction, energy dispersive spectrometry and vibrating sample magnetometry were used to characterize the appearance, size distribution, phase, chemical composition and magnetic characteristics of silica magnetic microspheres （MMS）. The results show that the silica MMS prepared exhibit a superior core - shell structure. The size distribution of the microspheres averaged about 20 μm and the main phase of microspheres is amorphous SiO2 and spinel Fe3O4. The microspheres retain superparamagnetic behavior and can be used as biomaterials.
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