Abstract
Core@shell Fe@FexOy nanoparticles (NPs) have the potential to be promising tools for many applications, thanks to their combination of an iron core, with a high magnetic moment and an iron oxide sh...
Highlights
IntroductionIron (Fe) nanoparticles (NPs) have been gathering much attention in the past few decades due to their intrinsically high saturation magnetization (Ms).[1]
Iron (Fe) nanoparticles (NPs) have been gathering much attention in the past few decades due to their intrinsically high saturation magnetization (Ms).[1]. This is desirable for many biomedical applications such as magnetic hyperthermia, magnetic resonance imaging (MRI), magnetic cell separation, and targeted drug delivery.[2−9] In the case of magnetic hyperthermia the higher magnetic moment can result in better performances compared to relative oxides, and proof-of-concept demonstrations with Fe NPs have shown promising results.[10]
The NPs appear to be fully oxidized after being exposed to air
Summary
Iron (Fe) nanoparticles (NPs) have been gathering much attention in the past few decades due to their intrinsically high saturation magnetization (Ms).[1]. High-quality Fe NPs are typically synthesized in organic solvents where it is easier to control the crystal phase and size.[11] Once formed in solution, the metallic Fe NPs are partially oxidized to form an oxide layer on the surface by adding oxidizing agent[12] or exposing the solution to air.[13] This can act as a protective shell for the Fe core to suppress further oxidation. Before being used in biological conditions, Fe NPs need to be transferred into water, usually via ligand exchange of the surfactants bound to the iron oxide shell surface.[13] The effect of the latter process upon the chemical stability of the core@shell structure has been rarely
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