Fe fine particles encapsulated by titanium oxides with high magnetization for biomedical application

Iron (Fe) fine particles encapsulated by titanium oxide (TiO2) were synthesized through a solid-phase reaction. The structure of Fe cores and TiO2 shells consisted of α-Fe and rutile TiO2, respectively. The average particle size was 0.8 μm, in which a Fe particle with a diameter of ∼750 nm was encapsulated by a TiO2 shell with a thickness of ∼100 nm. The Fe particles had a high saturation magnetization of 127 Am2/kg and low coercivity of 1.6 kA/m. They also exhibited excellent corrosion resistance, similar to Fe3O4 in a soaking test.