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采用加热分解油酸铁法制备了Fe3O4磁性纳米颗粒,并用有机模板和反相微乳液相结合的方法将磁性纳米颗粒包裹在多孔二氧化硅中.用红外光谱(FTIR)研究了不同的处理方式对油酸铁表面官能团的影响及油酸的反应浓度和加热分解油酸铁的过程中升温速率对Fe3O4纳米颗粒的影响.结果表明,用乙醇和丙酮处理后的固态蜡状油酸铁表面的油酸基团会受到损害,将不利于加热分解时形成单分散性的Fe3O4纳米颗粒.加热分解油酸铁的升温速率对Fe3O4纳米颗粒的形成影响不大,而当改变油酸的浓度后,Fe3O4的Fe-O的弯曲振动吸收570cm-1特征峰有明显的增强.X射线衍射仪(XRD)、透射电子显微镜(TEM)和超导量子干涉仪(SQUID)结果表明Fe3O4纳米颗粒为立方尖晶石结构,并且具有良好的单分散性和超顺磁性,用多孔SiO2可同时包裹多个Fe3O4颗粒.
Fe3O4 magnetic nanoparticles were prepared by thermal decomposition of oleic acid iron and magnetic nanoparticles were encapsulated in porous silica by a combination of organic template and reverse microemulsion.FTIR spectroscopy was used to investigate the effect of different treatment methods On the surface functional groups of oleic acid iron and the reaction concentration of oleic acid and heating rate of iron oleate decomposition process on the effect of Fe3O4 nanoparticles.The results showed that the surface of the solid waxy oleic acid treated with ethanol and acetone Oleic acid will be damaged, which will not be conducive to the formation of monodisperse Fe3O4 nanoparticles during heating and decomposition.The heating rate of oleic acid has little effect on the formation of Fe3O4 nanoparticles, but when the concentration of oleic acid is changed, Fe3O4 bending vibration absorption 570cm-1 characteristic peaks were significantly enhanced.X-ray diffraction (XRD), transmission electron microscopy (TEM) and superconducting quantum interference (SQUID) results show that the Fe3O4 nanoparticles tip Spinel structure, and has good monodispersity and superparamagnetism, with porous SiO2 can be wrapped more than one Fe3O4 particles.