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Hydrothermal Synthesis Of Surface-modified Iron Oxide Nanoparticles

S. Takami, Teruyuki Sato, T. Mousavand, S. Ohara, Mitsuo Umetsu, T. Adschiri
Published 2007 · Materials Science

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Abstract We synthesized surface-modified iron oxide nanoparticles in aqueous phase by heating an aqueous solution of iron sulfate (FeSO 4 ) at 473 K with a small amount of either n -decanoic acid (C 9 H 19 COOH) or n -decylamine (C 10 H 21 NH 2 ), which is not miscible with water at room temperature. Transmission electron microscopy showed that the addition of n -decanoic acid or decylamine changed the shape of the obtained nanoparticles. X-ray diffraction spectra revealed that the synthesized nanoparticles were in α-Fe 2 O 3 or Fe 3 O 4 phase while Fourier transform infrared spectroscopy and thermogravimetry indicated the existence of an organic layer on the surface of the nanoparticles. In the synthetic condition, decreased dielectric constant of water at higher temperature increased the solubility of n -decanoic acid or n -decylamine in water to promote the reaction between the surface of iron oxide nanoparticles and the organic reagents. After the synthesis, the used organic modifiers separated from the aqueous phase at room temperature, which may help the environmentally benign synthesis of surface-modified metal oxide nanoparticles.
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