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Dimensional effects in the properties of maghemite
Bulletin of the Russian Academy of Sciences: Physics, 2012Single-phase γ-Fe2O3 powders with a coercivity of 161–263 Oe are obtained from iron(III) hydroxide by hydrothermal synthesis followed by heat treatment. Particle size distributions are plotted, based on the TEM data. Magnetic measurements show that a significant decrease in the squareness ratio and coercivity occurs at a mean particle volume of 60000 ...
M. G. Osmolovsky, O. M. Osmolovskaya
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Magnetic Maghemite Nanoparticles
1997The chemical synthesis of maghemite (γFe3O4) magnetic nanoparticles and their complexation with dimercaptosuccinic acid (DMSA), yielding a solution of monocrystalline, monodomain, bare 7.5 nm particles (ferrofluid = FF) is described. The ferrofluid is stable in saline at neutral pH and enables binding of biological effectors to the particle core. Thus,
Avraham Halbreich +12 more
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Corrosion, 1990
Rusts from iron couplers of an old wooden water pipeline have been examined using x-ray diffraction (XRD) analysis and infrared (IR) spectroscopy. The old rusts characterize generally the scantiness of components, total lack of lepidocrocite, and, in some of them, the presence of maghemite displaying vacancy order, which changes the cubic face-centered
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Rusts from iron couplers of an old wooden water pipeline have been examined using x-ray diffraction (XRD) analysis and infrared (IR) spectroscopy. The old rusts characterize generally the scantiness of components, total lack of lepidocrocite, and, in some of them, the presence of maghemite displaying vacancy order, which changes the cubic face-centered
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Surface anisotropy in maghemite nanoparticles
Physica B: Condensed Matter, 2006Abstract In this work we address the effect of surface anisotropy upon the magnetic structure of ferrimagnetic maghemite γ-Fe 2 O 3 nanoparticles in the limit of low temperatures. Our model is based on a three-dimensional classical Heisenberg–Hamiltonian involving Fe 3+ nearest-neighbor interactions, surface and core anisotropies, and a Monte Carlo-
J. Restrepo, Y. Labaye, J.M. Greneche
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The thermal stability of nanocrystalline maghemite
Journal of Physics D: Applied Physics, 1998Nanocrystalline maghemite O was prepared by a wet chemical method. The thermal stability of this material has been investigated by using differential thermal analysis (DTA) measurements and x-ray diffraction analyses. One exothermic peak without weight loss appears irreversibly on the DTA curve.
Xisheng Ye +3 more
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Maghemite Nanoparticles on Supported Diblock Copolymer Nanostructures
Macromolecules, 2007Diblock copolymer nanostructures with metal oxide nanoparticles are prepared on solid supports by spin-coating. The maghemite nanoparticles (Fe2O3) are masked with grafted polystyrene chains to allow a tailored positioning on top of nanostructures created by the symmetric polystyrene-block-polyisoprene diblock copolymer.
Abul Kashem, M. M. +5 more
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Low Temperature Synthesis of Magnetite and Maghemite Nanoparticles
Journal of Nanoscience and Nanotechnology, 2007We report on the synthesis of iron oxide nanoparticles below 100 °C by a simple chemical protocol. The uniqueness of the method lies in the use of Ferrous ammonium sulphate (in conjugation with FeCl3) which helps maintain the stability of Fe2+ state in the reaction sequence thereby controlling the phase formation. Hexamine was added as the stabilizer.
Bhagwat, Shrikant +9 more
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Study on the Magnetorheological Properties of Maghemite-Kerosene Ferrofluid
Journal of Nanoscience and Nanotechnology, 2009As the ferrofluids are synthesized in a controlled atmosphere to Prevent oxidation of the magnetite phase; most reports of rheological properties have been derived from magnetite based ferrofluids. In this paper a ferrofluid based on iron oxide was synthesized by co-precipitation with air.
E, Ghasemi +4 more
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Crack patterns in superlattices made of maghemite nanocrystals
Physical Chemistry Chemical Physics, 2013Here, 11 nm γ-Fe2O3 nanocrystals characterized by a low size distribution of 5% and dispersed in chloroform are deposited onto a substrate as well-defined films. The film thickness is controlled by the initial concentration of the colloidal solution. After drying, the film shows a network of well-defined cracks.
Anh-Tu Ngo +2 more
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