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Synthesis and Characterization of Magnetic Nanocomposite Fe3O4@nSiO2@mSiO2 with Dual Shells Containing Non-Porous Silica and Mesoporous Silica Structure

Magnetic nanocomposites of Fe3O4@nSiO2@mSiO2 were synthesized by a two-step template method. Firstly, Fe3O4 magnetic core encapsulated clusters of SiO2 nanoparticles (Fe3O4@nSiO2, non-porous SiO2) was prepared by a spray drying method. Then the core-shell spheres of Fe3O4@nSiO2 were coated further with an m-SiO2 layer (mesoporous silica) by a sol-gel process using CTAB as a template. The resultant samples were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Nitrogen adsorption-desorption and Magnetic measurements. The acquired magnetic nanocomposites possess abundant mesopores, thus extends their potential application in biomedical and wastewater treatment due to their magnetic separation ability upon an external magnetic field.