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Transmission electron micrographs of Fe particles on Ludox silica. (a) Fe particles (30-50 nm) formed on surface of silica nanoparticles (22 nm). Brighter spots indicate Fe (higher atomic number). Scale bar is 50 nm. (b) Higher resolution image of spherical Fe nanoparticles with path indicating line scan for EDS. (c) EDS confirms elemental Fe composition of particle with silica background.
