采用部分还原沉淀法制备了Fe$_{3}$O$_{4}$磁性微球, 并用硅烷偶联剂对其进行了表面修饰. 利用X--射线衍射(XRD)、透射电子显微镜(TEM)、 原子力显微镜(AFM)、红外光谱(IR)和分光光度计等手段对其结构和性能进行了表征和测量, 研究了硅烷偶联剂对磁性纳米微球性能的影响. 结果表明, 修饰后的磁性纳米微球具有良好的分散性和磁响应性, 并且在强酸环境中具有良好的稳定性. 经不同硅烷偶联剂修饰后的微球表面可带有--OH, --NH$_{2}$, --NH, --C=O, --C=C等多种有机功能基团.
Magnetic microspheres were prepared through partial reduction--precipitation method. The surface of particles was modified by silane--coupling agents. The structure and properties of these magnetic microspheres were characterized by X--ray, TEM, AFM, IR, etc. The magnetic nanoparticles modified by silane-- coupling agents present favorable dispersibility, responsibility to magnetism and resist against the corrosion of acid or alkali solution. The results of investigation on modified nanoparticles with different silane--coupling agents also indicate that the particles have multi functional organic groups on their surface, such as --OH, --NH$_{2}$, --NH, --C=O, --C=C.
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