Preparation and characterization of multifunctional magnetic mesoporous calcium silicate materials

We have prepared multifunctional magnetic mesoporous Fe–CaSiO(3) materials using triblock copolymer (P123) as a structure-directing agent. The effects of Fe substitution on the mesoporous structure, in vitro bioactivity, magnetic heating ability and drug delivery property of mesoporous CaSiO(3) materials were investigated. Mesoporous Fe–CaSiO(3) materials had similar mesoporous channels (5–6 nm) with different Fe substitution. When 5 and 10% Fe were substituted for Ca in mesoporous CaSiO(3) materials, mesoporous Fe–CaSiO(3) materials still showed good apatite-formation ability and had no cytotoxic effect on osteoblast-like MC3T3-E1 cells evaluated by the elution cell culture assay. On the other hand, mesoporous Fe–CaSiO(3) materials could generate heat to raise the temperature of the surrounding environment in an alternating magnetic field due to their superparamagnetic property. When we use gentamicin (GS) as a model drug, mesoporous Fe–CaSiO(3) materials release GS in a sustained manner. Therefore, magnetic mesoporous Fe–CaSiO(3) materials would be a promising multifunctional platform with bone regeneration, local drug delivery and magnetic hyperthermia.