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Showing 1 to 20 of 75 for “"X-ray Absorption Fine Structure"”.
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Modeling Metal Protein Complexes from Experimental Extended X-ray Absorption Fine Structure using Computational Intelligence
Experimental Extended X-ray Absorption Fine Structure (EXAFS) spectra carry information about the chemical structure of metal protein complexes. However, pre- dicting the structure of such complexes from EXAFS spectra is not a simple task. Currently methods such as Monte Carlo optimization or …
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Structure of valinomycin-K+ complex and cryptate-k+ complex in solution by extended x-ray absorption fine structure
A new tool used to study the structure of molecules is Extended X-ray Absorption Fine Structure (EXAFS). EXAFS is small oscillatory signals added on to the smooth x-ray absorption structure curve produced from the excitation of an inner electron out of its bound inner shell into a free electron …
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Reactions of Halogenated Ethylenes on the α-Cr₂O₃ (101̅2) Surface
… surface chemistry. Photoemission and near edge x-ray absorption fine structure spectra show that all studied reactants undergo some C-X bond cleavage upon low temperature adsorption forming adsorbed C2 fragments and halogen adatoms. Photoemission for each reaction system shows at least two C1s …
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The influence of microstructure on the mechanical properties of some refractory compounds
… electron energy loss spectroscopy and extended x-ray absorption fine structure spectoscopy is presented in the context of their application to the study of the microstructure of transition metal carbides and diborides. The local atomic structure of amorphous titanium diboride thin films, prepared …
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Exafs Studies of Transition Metal Exchanged Zeolites
The extended X-ray absorption fine structure (EXAFS) that appears on the high energy side of the absorption edge of an element has been shown to be due to modifications to the final state wave function of the ejected photoelectron from the absorbing atom by its near neighbors.('1,2,3) Consequently, …
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Structural Characterization and Phase Behavior in Supported Metallic Nanoparticles
… has been followed by using in-situ extended X-ray absorption fine structure spectroscopy, temperature programmed desorption, and scanning-transmission electron microscopy. The data reveal that during activation in hydrogen the stabilizing CO shell is lost, and the metal centers assume an …
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Understanding the origin of the recovery of superconductivity in halogenated YBCO single crystal : atomic structure study
… this problem, we have performed multiple-edge x-ray absorption fine structure (XAFS) measurements about the Y K, Ba L_3, I L_3, Cu K and Br K-edges at room temperature on brominated (non-brominated) and iodinated (non-iodinated) YBCO single crystals. Our XAFS results at the Br K (brominated) and …
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A study of the structure of v-B2S3 and sodium thioborate glasses
… techniques which were used to explore the structure of the sodium thioborate glasses. Interest in these glasses have increased recently due to the fast ionic conduction behavior found in the sulfide based glasses. However, before much work can be done on the conductivity of these materials, …
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Multiscale Modeling and Mechanistic Analysis of Crystallization and Particulate Processes
… MOFs can be resolved through extended X-ray absorption fine structure (EXAFS); and nucleation and growth of MOF thin films can be resolved with in situ grazing incidence wide-angle X-ray scattering (GIWAXS) coupled with mechanistic modeling; and that continuum-scale crystal size …
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Reactivity and Structure of Supported Nickel Phosphides (Ni₂P) in Deep Hydrodesulfurization Catalysis
… catalysts with a wide range of techniques: X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and X-ray absorption fine structure (XAFS) spectroscopy. The use of these techniques allowed better understanding of the nature of the active …
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Operando Characterization of Lithium-Ion Batteries using Lab-Scale X-ray Emission/Absorption Spectroscopy
Tracking changes in the electronic structure of target elements is crucial to investigate the nature of redox reactions occurring in battery electrodes. Core-hole characterization techniques such as X-ray Emission Spectroscopy (XES) and X-ray Absorption Fine Structure (XAFS) perform this role well …
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SiC and B₄C as electrocatalyst support materials for low temperature fuel cells
… techniques were used to clarify the structure-property relationships between catalyst morphology, metal-support interaction, ORR activity and surface adsorption onto the Pt nanoparticles. Extended X-ray Absorption Fine Structure (EXAFS) analysis gave insights into the shape of the …
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Crystal Growth, Atomic Ordering, Phase Transitions in Pseudobinary Constituents of the Metastable Quaternary (gallium-Antimony)(1-X)(germanium(2)(1-Y)tin(2y))(x) (Semiconductor, Sputtering, Ion Bombardment, X-Ray Diffraction, Electron Microscopy)
… discharge sputter deposition. A combination of x-ray diffraction, Raman spectroscopy and extended x-ray-absorption fine-structure analyses are used to show that an order-disorder structural transition from zincblende to diamond occurs in metastable (GaSb)(,1-x)(Ge(,2))(,x) and …
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Nuclear forensic applications of uranium oxide chemistry and morphology
… of chemical signatures using powder X-ray diffraction (p-XRD) and extended X-ray absorption fine structure (EXAFS) analysis, and the second is the identification of morphological signatures contained in scanning electron microscopy (SEM) images using a standardized lexicon for …
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Structure and Ozone Decomposition Reactivity of Supported Manganese Oxide Catalysts
… of support on ozone decomposition kinetics. X-ray diffraction (XRD), in-situ laser Raman spectroscopy, temperature programmed oxygen desorption, surface area measurements, extended and near edge x-ray absorption fine structure (EXAFS and NEXAFS) showed that the manganese oxide was highly …
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Fundamental aspects of the chrome tanning reaction
… information regarding changes in the secondary structure of collagen during tanning. Complete breakdown of chrome tanned collagen was achieved by the use of a cocktail of proteolytic enzymes: this allowed an analysis of the isolated crosslinks, which indicated preferred reaction at aspartate …
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Uncovering molecular orientation and morphology at biotic/abiotic interface for peptide-based graphene sensors
… organic compounds (VOCs). Using near-edge X-ray absorption fine structure spectroscopy (NEXAFS) as the primary investigation tool, atomic-level information was obtained about the orientation of the peptide backbones in relation to the graphene surface upon the VOC binding. At the same time, …
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Mineral tanning mechanisms: a fundamental study
… tanned collagen. Techniques such as extended x-ray absorption — fine structure and x-ray absorption near structure were used to investigate the interaction of chromium (III) tanning salts and titanium (III) complexes with collagen. The research demonstrated that the shrinking reaction is …
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Landscape and environmental controls on soil organic matter decomposability in the High Arctic
… transform spectroscopy (DRIFTS) and Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy to explore how variability in vegetation and soil moisture across the High Arctic landscape influences soil organic carbon (SOC). My results demonstrate that vegetation type significantly …
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DISORDER IN MATERIALS
… in order to obtain more information about their structure and conduction. In addition, extended x-ray absorption fine structure (BXAFS) was to be used to probe the local structural changes that occur in cells of a copper ion conductor, cumoti (Copper> 4 methyl 1, 4 oxathianlumlodld) at different …
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