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Nanorods of Iron Oxalate Synthesized Using Reverse Micelles: Facile Route for α-Fe2O3 and Fe3O4 Nanoparticles

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Abstract:

Uniform and smooth nanorods of iron oxalate dihydrate have been synthesized using the reverse micellar route in the presence of the cationic surfactant CTAB (cetyltrimethyl ammonium bromide). These rods have an average diameter of 70nm and length of 470nm and show an antiferromagnetic ordering at 27 K. The oxalate rods act as suitable precursor for obtaining a variety of iron oxide nanoparticles depending on the nature of the atmosphere in which decomposition is performed. Spherical α-Fe2O3 nanoparticles (∼50 nm) were obtained when the nanorods were decomposed in air (500 °C) and show a transition from a weakly-ferromagnetic to weakly anti-ferromagnetic behaviour at ∼225 K which is reminiscent of a Morin-like transition. Cuboidal Fe3O4 nanoparticles (∼60–70 nm) were obtained by the decomposition at 500 °C in vacuum (∼10−5 torr) and show a Verwey transition at 122 K.

Keywords: IRON OXALATE; MAGNETIC PROPERTIES; NANORODS; REVERSE MICELLE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2007.763

Publication date: June 1, 2007

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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