Abstract
A new approach to prepare the magnetic composite microspheres of Fe3O4 and copolymer of styrene-co-butyl acrylate was reported by a phase inversion emulsion technique. During the phase inversion process, the system converts from a continuous bulk organic phase to a continuous aqueous phase dispersed with organic drops composed of monomers, polymers, and Fe3O4 particles. The obtained Fe3O4/styrene-co-butyl acrylate composite microspheres were mostly spherical with a diameter in the range of a few micrometers to dozens of micrometers. Also, large amounts of Fe3O4 particles present in the interior of the microspheres and some were embedded in the surface. The results from X-ray powder diffraction indicated the crystal structure of Fe3O4 was not changed during the preparation of microspheres. According to TGA curve, the content of Fe3O4 particles in microspheres reached approximately 48%. The microspheres exhibited superparamagnetism. High-magnetic-content microspheres can be easily obtained by this method.
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