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Synthesis and Characterization of Nanometer-Size Fe3O4 and γ-Fe2O3 Particles

Chemistry of Materials · 1996 · Vol. 8(9) · pp. 2209–2211

Young Soo Kang✉(Interface (United States))Subhash H. Risbud(Interface (United States))John F. Rabolt(Interface (United States))Pieter Stroeve(Interface (United States))

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Abstract

Synthesis of suspensions of nanosize particles of Fe3O4 was carried out in bulk aqueous solutions without the presence of surfactants. The Fe3O4 nanoparticles were oxidized to γ-Fe2O3 by direct aeration of the suspension at 100 °C. The shape and size distribution and crystallinity of the Fe3O4 nanoparticles were assessed by transmission electron microscopy and selected area electron diffraction. Very uniform and stable colloidal suspensions of the Fe3O4 nanoparticles in water could be synthesized. Oxidation of the colloidal system leads to γ-Fe2O3 nanoparticles of much larger size than Fe3O4.

Iron oxide chemistry and applications Nanoparticle-Based Drug Delivery Nanomaterials for catalytic reactionsCrystallinityNanoparticleTransmission electron microscopyNanometreMaterials scienceColloidSuspension (topology)Aqueous solutionChemical engineeringParticle size

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Monodisperse MFe2O4 (M = Fe, Co, Mn) Nanoparticles