· Four samples containing ultrafine- and fine-grained magnetite of magnetoferritins and magnetotactic bacteria cells were magnetically characterized at both room and low temperatures. Transmission electron microscopy analysis showed that the biometrically synthesized magnetoferritins (M-HFn) have magnetite cores with a mean
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The conversion of magnetite to maghemite has been studied kinetically in the ultrafine particle range (77-220 Å) by chemical analysis. X-ray diffraction, and Mössbauer measurements. The reaction is third order. The activation temperatures are
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· Panzhihua, the largest vanadium–titanium magnetite resource base, provides more than 70% ilmenite for the titanium industry in China [1], [2]. Owing to the complex element lattice substitution, the vanadium–titanium magnetite ore in Panzhihua is finely ground to recover the titanium magnetite [3] .
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· The main reason for the magnetic enhancement is pedogenic formation of fine-grained (~0.03 μm) ferrimagnetic particles of magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ) in the upper soil
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A new extraction technique now permits ultrafine magnetite crystals to be separated from a variety of deep-sea sediments. Morphologic characterization of these particles with transmission electron microscopy reveals the presence of several distinct crystal types, some of which closely resemble those formed by the magnetotactic bacteria. The
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Além disso, visou-se a obtenção predominante da fase magnetita (Fe3O4) tendo em vista suas propriedades magnéticas. Os materiais resultantes do processo de combustão em
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· The preparation of magnetite Fe3O4 and its morphology control by a novel arc-electrodeposition method Chenglin Wang G. Zhu Zuyao Chen Z. G. Lin Materials Science 2002 34 Save Hydrothermal synthesis and characterization of
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The amorphic ferric oxide is synthesized by neutralizing a ferric chloride solution, and has no distinct diffraction maxima detectable by powder X-ray diffraction analysis5• The medium contains
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Salão de Iniciação Científica (16. : 2004 : Porto Alegre). Livro de resumos. Porto Alegre : UFRGS, 2004.
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· Materials Pure quartz (> 99% SiO 2) and magnetite (> 96% Fe 3 O 4) samples (Fig. 1) were obtained from VWR, Sweden.The samples were ground using a laboratory-scale ball mill to produce flotation feed. The flotation feed had a d 80 = 16.7 µm, a d 50 = 7.5 µm, and a mean diameter of 9.55 µm.
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· Besides magnetite, we also observe other Fe-bearing NPs such as rounded crystal NPs only consisting of Fe, Mn, and Ni (Fig. 2h–j and Supplementary Fig. 5) that resemble Fe-Mn-Ni alloy particles
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de óxidos de hierro y la generación de magnetita ultrafina. Por otro lado, Boyle et al. (2010) sugieren que la señal es resultado de un material parental rico en hierro y que se
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A new extraction technique now permits ultrafine magnetite crystals to be separated from a variety of deep-sea sediments. Morphologic characterization of these particles with transmission electron microscopy reveals the presence of several distinct crystal types, some of which closely resemble those formed by the magnetotactic bacteria.
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· Application of ultrafine magnetite nanoparticles in different types of water. Individual removal of Pb 2+ , Cu 2+ , Cd 2+ , and Ni 2+ ions from contaminated (a) deionized water and (b) river water.
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：7 · 1 El enriquecimiento magnético es causado por magnetita ultrafina y partículas de maghemita (Fe 2.67 O 4 , producto de la rápida oxidación de la magnetita
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· Magnetite nanoparticles (Fe3O4 NPs) are widely tested in various biomedical applications, including magnetically induced hyperthermia. In this study, the influence of the modifiers, i.e
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· For improving the strength of pellets made of ultrafine and super-high-grade magnetite concentrates, the influence of basicity (CaO/SiO2 ratio) on the roasting and consolidation of pellets was investigated. The results showed that with the basicity of pellets increasing from 0.09 to 0.60, the compressive strength of both preheated and
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O objetivo deste trabalho foi a obtenção de nanopartículas de óxido de ferro bifásico (Fe2O3-α, Fe3O4) via síntese de combustão em solução, estudando a influência da
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· Ultrafine magnetite particles were prepared through a hydrothermal process at 130°–150°C from a solution of iron chloride and iron powder in the presence of urea. XRD and chemical analysis indicated that the product was magnetite. The size and morphology of the particles were studied by TEM. The magnetite particles had a
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· Additionally, in this image marked two characteristics for magnetite structure lattice spacing equal to 0.294 nm for (2 2 0) planes and 0.210 nm for (4 0 0) planes. This clearly confirms, that the synthesized ultrafine (4.85 nm) tin-doped nanoparticles have a highly crystalline structure.
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· Simple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent sizes of target mineral particles, and improve
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· The magnetite powder with a wide particle size of 0.3–0.15 mm was selected as the major fluidized medium in this study. The simulation and experiment results indicate that the bed pressure drop
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A kinetic study of the transformation of ultrafine magnetite particles to y-Fe,O,, made in order to clarify quantitatively the catalytic activity of fine magnetite powders, is reported in this paper. Gamma ferric oxide, 7-Fe203, is the allotropic form of magnetite, Fe,O,. These two iron oxides are crystal- lographically isomorphous.
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aumento de partículas de magnetita ultrafinas (SP-SD) no meio, em decorrência de sua atividade metabólica. Utilizando esse argumento, os diversos parâmetros ambientais
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· Magnetite (Fe3O4) exhibits superparamagnetism as its size shrinks in the single-domain region to around 20 nm, which is an essential property for use in biomedical applications. In this review, the
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· Geldart A − particles, Geldart A magnetite particles “modulated” by a small fraction of Geldart C ultrafine coal particles, is proposed. Fundamental studies are carried out to provide a comprehensive understanding of its hydrodynamics , including the minimum fluidization velocity, bed expansion, and spatial bed density distribution.
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· Here, we report a simple and green electrochemical route to fabricate a porous network of a Fe3O4 nanoparticle-porous reduced graphene oxide (p-rGO) nanocomposite supported on a nickel-foam
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· Magnetite ores are among the most important sources of iron, which is in high demand in the global economy. Metallurgical properties of the magnetite concentrate significantly depend on impurities of silicon- and aluminum-bearing minerals. These impurities have to be separated from ore by magnetic separation and flotation
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Two kinds of magnetite concentrates from Pilbara in Australia and an area in the northeast in China were used to explore the effect of wettability, which depends on particle size, on ballability. Capillary osmosis equipment of a horizontal plate was constructed based on the equation Washburn. To investigate the effect of particle size and wettability of ultrafine
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magnetite nanoparticles from Fe(III) precursor at room temperature Andris Šutka1,* , Sanda Bitina1, Krisjanis Smits2, Anna Šutka 1, Liga Bikse2, Mikhail Maiorov3, Tanel Käämbre4, Martin Timusk4, Lauma Laipniece5, and Kristine Lazdovica5 1 Faculty of Latvia
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Trituradora de piedra vendida por proveedores certificados, como trituradoras de mandíbula/cono/impacto/móvil, etc.
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