偶联剂修饰纳米磁性微球的制备及其表征

The preparation and characterization of the MNPs mondified by silane-coupling agents

以三氯化铁水溶液作原料 ,采用部分还原沉淀法 ,通过控制一些影响反应的参数 ,制备纳米磁性微球 (Magneticnanoparticles ,MNPs) ,并用道康宁Z 6 0 4 0硅烷偶联剂对其进行了表面修饰。利用透射电镜、X 射线衍射、红外光谱、古埃磁天平、可见光分光光度计等手段对MNPs的形貌、粒度分布、物相组成、表面包覆官能团、磁化率、分散性等进行了表征。用硅烷偶联修饰前后粒度分布呈高斯正态分布 ,主要集中在 10～2 5mm ;主要物相为Fe3O4 晶体 ,另外还夹杂着少量γ Fe2 O3;分散性得到改善的同时 。

Magnetic nanoparticles (MNPs) were prepared by controlling some chemical reaction parameters through partially reduction-precipitation method with ferric chloride aqueous solutions as precursor material.The surface of particles were modified by Z-6040 silane-coupling agents.The appearance,the size distribution,structure and phase constitute,function groups of the surface,magnetic susceptibility and the dispersibility of MNPs were characterized by TEM,XRD,IR,the Gouy magnetic balance and visible light spectrophotometer etc.The results indicate that the size of MNPs presents a Gaussian distribution before and after modiefied.The main phase consititute is Fe 3O 4 with little γ-Fe 2O 4 before modified.After modified,the dispersitbility of the MNPs will improve,beside,the magnetic susceptibility maintains a good state.