【摘要】 报道了一种简单合成中空Fe3O4/SiO2磁性微胶囊的方法,即以反相乳液的水滴作为形成中空结构的软模板,通过界面溶胶-凝胶过程,制备中空Fe3O4/SiO2磁性微胶囊。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、选区电子衍射(SAED)、多晶粉末X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)及磁滞回线测量等手段对样品的结构和性质进行表征和研究。XRD、SAED和FTIR分析结果表明,微胶囊由SiO2和Fe3O4磁性纳米粒子(MPs)组成。SEM和TEM观察结果表明,微胶囊具有中空结构,且SiO2壳层具有多孔特性。磁性能检测结果表明,微胶囊具有超顺磁性和磁响应性。通过对比实验,提出SiO2界面异相成核的中空磁性微胶囊的形成机理。更多还原

【Abstract】 A facile route to prepare hollow magnetic Fe3O4/SiO2 microcapsules via an interfacial sol-gel process in inverse emulsion was reported.Water droplets acted as soft template for the formation of hollow structure.The samples were characterized and studied with scanning electron microscopy(SEM),transmission electron microscopy(TEM),selected area electron diffraction(SAED),X-ray powder diffraction(XRD),fourier transform infrared(FTIR)spectroscopy and magnetic hysteresis loop measurements.The results of XRD,SAED and FTIR showed that the microcapsules were made from SiO2 and Fe3O4 magnetic nanoparticles(MPs).The images of SEM and TEM showed that the fabricated microcapsules were hollow and the silica shells were porous.Magnetic characterization revealed that the hollow microcapsules displayed superparamagnetism and magnetic induction.Through a control experiment,it was proposed that the formation mechanism of hollow magnetic microcapsules was heterogeneous nucleation of SiO2 at the interface of oil and water.更多还原