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Magnetic properties of maghemite nanoparticles
Bulletin of the Russian Academy of Sciences: Physics, 2014Magnetic particles of maghemite (spinel γ-Fe2O3) are synthesized by means of aerosol pyrolysis, making it possible to produce chemically uniform highly-dispersed single-phase materials. The magnetic properties of synthesized particles for temperatures ranging from helium temperature up to room temperature and higher are investigated using a SQUID ...
V. N. Nikiforov +4 more
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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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Maghemite in soils and its origin
Clay Minerals, 1974AbstractThe products of air oxidation of mixed Fe(II)-Fe(III) chloride solutions at pH 6 and 7, at 20 and 60°C and at normal pressure contain green rust, maghemite, lepidocrocite, goethite and a paracrystalline ferric hydroxide (ferrihydrite). Among these maghemite, a cubic ferromagnetic iron oxide (Fe2O3) found in many soils, is favoured by slow ...
R. M. Taylor, U. Schwertmann
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Mössbauer study of maghemite nanoparticles
Technical Physics Letters, 2012Mossbauer spectroscopy has been used to study maghemite (γ-Fe2O3) particles with average dimensions on the microscopic (∼1 μm, “bulk” state) and nanoscopic (15 and 20 nm) levels. Data provided by this method on the thickness of a surface region of magnetic nanoparticles and features of their magnetic state have been analyzed.
I. N. Zakharova +3 more
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Synthesis and characterization of maghemite nanosheets
Materials Letters, 2011Abstract Magnetic maghemite nanoparticles in the form of nanosheets were prepared by a topotactic transformation during the dehydroxylation of a γ-FeO(OH) precursor. The precursor was synthesized from tetrapyridin Fe(II) chloride (Fe(py) 4 Cl 2 ). The nanosheets are several hundreds of nanometers wide, and less than 5 nm thick; they frequently bend ...
Miha Drofenik +3 more
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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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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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