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

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 926-930)
• Pages: 308-311
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.926-930.308
• Online since: May 2014
• Authors: Qian Yu, Jing Jing Sang, Ai Ping Fu, Hong Liang Li*
• Keywords: Core-Shell Structure, Magnetic Separation, Mesoporous Materials

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