Journal
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
Volume 27, Issue 5-8, Pages 1377-1381Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2006.09.002
Keywords
SAXS; ferrofluids; magnetic nanoparticles
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Nanoparticles consisting of a magnetic core (gamma-Fe2O3) and an organic shell were prepared by thermal decomposition of an iron carbonyl complex in the presence of oleic acid. The nanoparticles were then dispersed in cyclohexane to form a stable ferrofluid. These dispersions were investigated by means of Small Angle Scattering of X-rays (SAXS) and the data were interpreted according to a pearl necklace model, opportunely modified to account for the core-shell structure of the magnetic nanoparticles. The results of the fittings show that nearly monodisperse spherical particles with a radius of the magnetic core of about 3.9 nm and a shell of about 2 nm were obtained. These nanoparticles self-assemble in chain-like structures, even in the absence of an applied magnetic field. (c) 2006 Elsevier B.V. All fights reserved.
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