Abstract
Magnetic metal silica submicrospheres were produced from silica coated on magnetic nanoparticles using well controlled hydrothermalled method and were characterized by TEM, XRD, FTIR, XPS. The well-designed mesoporous magnetic metal silciate had a large specific area, high magnetization. Firstly, SiO2-coated maghemite (Fe3O4@SiO2 composites) were synthesized by an sol-gel method, in which the iron ferrous chloride as well as TEOS acted as the precursor for maghemite and SiO2, respectively. The Fe3O4@SiO2 composites revealed a core-shell structure, Then, Fe3O4@SiO2/X3Si2O5(OH)4(X = Ni, Cu, Zn) was obtained by hydrothermalled with metal chloride. The resulting composites show not only a magnetic response to an externally applied magnetic field, but also can be a good adsorbent for bovine hemoglobin in the ambient temperature.
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