Abstract
Magnetite nanoparticles coated by mesoporous silica were synthesized by an alternative chemical routeusing a neutral surfactant and without the application of any functionalization method. The magnetite(Fe3O4)nanoparticles were prepared by precipitation from aqueous media, and then coated with mesoporoussilica by using nonionic block copolymer surfactants as the structure-directing agents. The mesoporousSiO2-coatedFe3O4 samples were characterized by x-ray diffraction, Fourier-transform infrared spectroscopy,N2 adsorption–desorption isotherms, transmission electron microscopy,57Fe Mössbauer spectroscopy, and vibrating sample magnetometry. Our results revealed that the magnetitenanoparticles are completely coated by well-ordered mesoporous silica with free pores and stable(∼8 nm thick) pore walls, and that the structural and magnetic properties of theFe3O4 nanoparticles are preserved in the applied synthesis route.
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