Novel Fe@C-TiO2 and Fe@C-SiO2 water-dispersible magnetic nanocomposites

► Fe-FexCy@C nanoparticles were obtained using laser pyrolysis technique. ► These nanoparticles present a high (110 A m2/kg) magnetization saturation (Ms). ► Hydrophilized Fe@C nanoparticles were coated by sol-gel with SiO2 or TiO2. ► Resulted nancomposites contain Fe@C cores surrounded by disordered/porous shell. ► Near superparamagnetic behavior and 26 or 57 A m2/kg Ms values were found.