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Spin-canting and transverse relaxation in maghemite nanoparticles and in tin-doped maghemite
Journal of Magnetism and Magnetic Materials, 2006Abstract The magnetic properties of maghemite nanoparticles and tin-doped maghemite have been studied by 57 Fe and 119 Sn Mossbauer spectroscopy at temperatures from 6 to 300 K with and without applied magnetic fields. The low-temperature 57 Fe spectra of both samples, obtained in a field of 4 T, can be described in terms of A-site and B-site ...
Örn Helgason +2 more
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Maghemite Nanoparticles by View of Mossbauer Spectroscopy
ChemInform, 2006AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Jirí, Tucek +2 more
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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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Spin frustration in maghemite nanoparticles
Solid State Communications, 2001Abstract A different degree of internal structural disorder is observed in almost identical and uniform γ-Fe2O3 nanoparticles of about 3.5±0.6 nm, prepared by laser pyrolysis, by high-resolution transmission electron microscopy (HRTEM) and Mossbauer spectroscopy.
C.J. Serna +5 more
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Antioxidant polymer-modified maghemite nanoparticles
Journal of Magnetism and Magnetic Materials, 2019Abstract Natural antioxidants, such as epigallocatechin-3-gallate and related phenolic compounds from tea, enhance particle cell-interactions and cellular uptake. In this study, surface of superparamagnetic iron oxide nanoparticles prepared by co-precipitation of Fe chlorides was modified with silica, polyethylenimine, poly(ethylene glycol), and poly(
Vitalii Patsula +5 more
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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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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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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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Multilamellar liposomes entrapping aminosilane-modified maghemite nanoparticles: “magnetonions”
Physical Chemistry Chemical Physics, 20104.6 nm-sized aminosilane-modified maghemite (γ-Fe(2)O(3)) nanoparticles (aMNPs) were synthesized and encapsulated into onion-type multilamellar vesicles of soybean phosphatidylcholine (90%mol) and monoolein (10%mol). The magnetic multilamellar vesicles were obtained by shearing lipids with an aqueous dispersion of the preformed aMNPs (ferrofluid).
Marie-Edith, Meyre +8 more
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Spin freezing in maghemite nanoparticle systems
Journal of Magnetism and Magnetic Materials, 2001Abstract The static and dynamical properties of two powder samples of γ -Fe 2 O 3 nanoparticles, with average diameter D =2.7 and 4.6 nm have been investigated by AC and DC susceptibility measurements. The results provide evidence of a collective dynamical freezing due to dipole interactions, at a size-dependent temperature ( T =95 K for D =2.7 ...
D. FIORANI +5 more
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