The porous magnetic gelatin microspheres were prepared as follows: firstly, the magnetic gelatin microspheres were obtained by an emulsion method and then tetraethyl orthosilicate (TEOS) was directly added into the emulsion system under vigorous stirring. The morphologies of the microspheres were observed by SEM and TEM. The structure and properties of the microspheres were characterized by FT-IR, TGA and VSM. The results showed that the silica was intermingled into the magnetic gelatin microspheres. The TEOS acted as a cross-linking hardening agent in the system. The results illustrated that the oxidation speed of the magnetic nanoparticles in the porous magnetic gelatin microspheres was slower than that in the magnetic gelatin microspheres. The porous magnetic gelatin microspheres displayed ferromagnetism properties.

Key words: emulsion method, porous, gelatin, silica