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Synthesis of Magnetic Fe3O4 Microparticles and SiO2/Fe3O4 Composite Spheres

Author: ZhangZuo
Tutor: ShenFengLei
School: Suzhou University
Course: Materials Processing Engineering
Keywords: Fe3O4 Solvothermal Magnetic materials Silica
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract


Magnetic magnetite particles exhibit some individual properties because of their unique physical and chemical properties, and have a wide range of potential applications in such areas as magnetic recording, ferrofluids, catalytic carrier, biomedicine and pollution control etc. This dissertation focused on the synthesis of magnetic Fe3O4 microparticles via self-assembly of Fe3O4 nanoparticles which have many excellent properties including monodisperse, well crystallization, higher saturation magnetization, as well as the preparation of magnetic SiO2/Fe3O4 composite spheres.Ferromagnetic Fe3O4 nanoparticles were synthesized and then self-assembled into microparticles via a solvothermal method, using FeCl3·6H2O as the iron source, sodium oleate as the surfactant, and ethylene glycol as the reducing agent and solvent. The obtained Fe3O4 microparticles were characterized by X-ray powder diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, Raman spectroscopy and Vibrating sample magnetometer （VSM）. The size and morphology of the particles were examined using Transmission electron microscopy （TEM） and Scanning electron microscopy （SEM）. The Fe3O4 microparticles of nearly monodisperse diameters, controllable in the range of 120–400 nm, consist of assemblies of Fe3O4 nanoparticles with a diameter of 22 nm. The effects of reaction time, amount of surfactant and NaAc on the products were discussed. Interestingly, by using the pre-synthesized Fe3O4 microparticles as the growth substrates, spherical and smooth-looking Fe3O4 microparticles with average diameter of 1μm were obtained. A plausible formation process was discussed.Fe3O4/silica nanocomposite microspheres have been successfully established by employing a solution-based route via direct decomposition of tetraethyl ortho-silicate （TEOS） in solution under the presence of Fe3O4 nanoparticles （NPs） freshly-synthesized by Solvothermal method and Coprecipitaion method, respectively. The route is based on a two-step process, involving: （ⅰ） synthesis of Fe3O4 NPs as growth seeds; （ⅱ） formation of Fe3O4/silica nanocompounds by direct decomposition of TEOS in the presence of dispersed Fe3O4 NPs of （ⅰ） under mechanical stirring at room temperature. The effects of the dosage of TEOS have been investigated. XRD, FTIR, EDS and SEM were used for the characterization of the synthesized products. Morever, a possible formation mechanism of Fe3O4/silica nanocompounds was also discussed.

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