Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 140 for “"hematite"”.
-
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 …
-
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 …
-
Comparison of hydroxamate and fatty acid flotation of hematite, A
Includes bibliographical references.
-
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 …
-
Gas phase (C-H-O) carbidization of iron from hematite at 625 °C
Includes bibliographical references (pages 130-133).
-
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 …
-
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 …
-
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
-
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 …
-
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 …
-
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 …
-
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).
-
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 …
-
Interactions of molybdenum and vanadium with iron nanoparticles
… and thermodynamics (activation energies) of the hematite formation were assessd with in situ synchrotronbased difraction tehnique in the presence and the absence of molybdenum and vanadium under conditions mimicing the geochemistry of deep sea hydrothermal systems (ionic strength = 0.7, pH = 8). …
-
Numerical Modeling Of Dissimilatory Iron Reduction In Sediments At A Field Site
… parameters for the biological reduction of hematite. Three possible rate formulations were proposed to describe the bioreduction rate of hematite, and two kinds of simulation were conducted to validate the formulations and parameters with both batch and column experimental data: a …
Page 1 of 7