Carboxylated SiO2-coated α-Fe nanoparticles have been successfully prepared via CaH2-mediated reduction of SiO2-coated Fe3O4 nanoparticles followed by surface carboxylation. These α-Fe-based nanoparticles, which are featured by ease of coating with additional functional groups, large magnetization of 154 emu/g-Fe, enhanced corrosion resistivity, excellent aqueous dispersibility, and low cytotoxicity, have a potential to be a versatile platform in biomedical applications.
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