Synthesis and characterization of amine-functionalized magnetic silica nanoparticle

Abstract

In present work, we prepared Magnetite nanoparticles (MNPs) by coprecipitation of Fe2+ and Fe3+, subsequently these magnetite core particles were coated with silica using tetra ethyl ortho silicate (TEOS). Then surface of silica coated magnetite nanoparticles was functionalized with aminopropyl groups using 3-aminopropyl trimethoxy silane (APTS) as a silylating agent. The morphology of the silica coated magnetite particles was observed to be spherical from SEM images. The hydrodynamic size was found to be 232 nm by dynamic light scattering. The cubic spinel structure for the magnetite nanoparticles were identified by X-ray diffraction studies. FTIR analysis shows that –NH2 groups have been incorporated onto the surface of the magnetite nanoparticles by Fe-O-Si chemical bonds.