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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 148 for “"Hematite"”.
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Nanoscience Meets Geochemistry: Size-Dependent Reactivity of Hematite
… nanominerals. The rate of Mn²⁺(aq) oxidation on hematite with average diameters of 7.3 nm and 37 nm was measured in the presence of O₂(aq). In the pH range of 7-8, the surface area normalized rate was one to two orders of magnitude greater on the 7.3 nm average diameter particles. Based on the …
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Bioreduction of Hematite Nanoparticles by Shewanella oneidensis MR-1
… dissertation is presented on the bioreduction of hematite (α-Fe2O3) nanoparticles. The study shows that an alternative extracellular electron transfer mechanism other than the classical 'direct-contact' mechanism may be simultaneously employed by Shewanella oneidensis MR-1 during solid-phase metal …
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Comparison of hydroxamate and fatty acid flotation of hematite, A
Includes bibliographical references.
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First-principles study of doped hematite surfaces for photoelectrochemical water splitting
… solar energy. Owing to its various advantages, hematite (α-Fe2O3) has emerged as a promising photoanode material for PEC water splitting. However, its poor electrical conductivity, low carrier mobility, short-hole diffusion length, and fast recombination rates of the electron-hole pairs have …
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The effects of magnetic fields on the reduction of hematite by hydrogen
Electronic Thesis or Dissertation
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Gas phase (C-H-O) carbidization of iron from hematite at 625 °C
Includes bibliographical references (pages 130-133).
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Equilibrium configurations of oxygen bubbles on surfaces for applications in nanostructured hematite electrodes
… is in the nanostructuring of [alpha]-Fe₂O₃ (hematite) for photoelectrochemical (PEC) splitting of water to generate hydrogen. A model of a bubble on a nanorod was developed in this work to facilitate the understanding of equilibrium configurations of oxygen bubbles on a nanostructured …
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URANYL DEPOSITION IN UNCONFORMITY-RELATED DEPOSITS IN THE ATHABASCA BASIN: EVIDENCE FROM URANIUM SPECIATION IN HEMATITE AND GOETHITE
… commonly accompanied by extensive and intensive hematite-rich alteration halos. Previous U L3-edge XANES studies of uranium-bearing fluid inclusions and thermodynamic modeling demonstrated uranium transport as uranyl (UO22+) species in hypersaline fluids in the Athabasca basin. Electron …
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Recrystallization and Grain Growth of Quartz and Hematite in a Metamorphic Gradient, Negaunee Iron Formation, Upper Peninsula, Michigan
Made available in DSpace on 2014-12-11T18:09:56Z (GMT). No. of bitstreams: 1 7207061.pdf: 4068315 bytes, checksum: 864ddda01eed869574b7ee43ae41d35e (MD5) Previous issue date: 1971
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The study of the degradation of hexabromocyclododecane in a heterogeneous system containing Fe(II) adsorbed to the iron oxide Hematite.
… reactive Fe(II) adsorbed to the iron oxide hematite. The adsorbed Fe(II)/iron oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic …
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The electronic structure of galena and hematite surfaces: applications to the interpretations of STM images, XPS spectra and heterogeneous surface reactions
… spectroscopy (STS) spectra of galena (PbS) and hematite (a-Fe203) were calculated using ab-initio methods in order to interpret experimental images and spectra that were taken in previous studies. These calculations have helped to understand which states of the mineral surfaces were imaged …
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Advanced photoanodes for photoassisted water electrolysis
… enabling energy storage via chemical means. Hematite or [alpha]-Fe₂O₃ has emerged as a highly promising photoanode candidate for photoelectrochemical cells. While significant improvements in its performance have recently been achieved, it remains unclear why the maximum photocurrents still …
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Application of surface complexation modeling to the adsorption of uranium(VI) onto hematite in the presence of humic and fulvic acids, The
Includes bibliographical references (pages 154-160).
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Corrosion behaviour of ferritic stainless steels in H2/H2O environments
… During long term exposures, formation of hematite (Fe2O3) was identified. Hematite was calculated to be thermodynamically unstable at the specified (H2/H2O) environments. A potential cause of the hematite formation was studied; that the Water-Hydrogen-Oxygen reaction did not come to …
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An investigation of the iron deposits in the East River Mountain district
… within the area studied over 60 million tons of hematite were contained in the ferruginous sandstones present in the East River Mountain district. Thus these sandstones constitute a large potential for commercial iron ore if extraction is possible. In September of 1956 9 laboratory study of the …
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