Novel core-shell nanocomposites based on TiO -covered magnetic Co O for biomedical applications.

Magnetic Co O nanoparticles (NPs) have great potential for applications in biomedicine, as contrast enhancement agents for magnetic resonance imaging, or for drug delivery. Although these NPs are so attractive, their potential toxicity raises serious questions about decreasing cellular viability. In this context, Co O NPs were prepared via sol-gel method and encapsulated with a layer of TiO , a biocompatible oxide, and subjected to structural, magnetic and toxicity characterization.