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Showing 1 to 20 of 43 for “"extended 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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The influence of microstructure on the mechanical properties of some refractory compounds
… physics of 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 …
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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
… nanoparticle 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 …
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Multiscale Modeling and Mechanistic Analysis of Crystallization and Particulate Processes
… in bimetallic 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 …
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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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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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Mineral tanning mechanisms: a fundamental study
… of semi- metal tamlages. The research was extended to investigate the hydrothermal shrinking of 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 …
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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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Magnetic Nanoparticles Based on Iron: Synthesis, Characterization, Design, and Application
… media. Structural analysis to confirm the structures was performed using extended x-ray absorption fine structure (EXAFS) techniques. A rapid characterization technique was developed utilizing a correlation between Fourier transform infrared spectroscopy and EXAFS to determine the full …
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The stress and strain behavior of materials for energy storage and production
… microstructuring is utilized in order to design structures that can withstand the large volumetric strains associated with forming lithium rich alloys during the normal operation of lithium-ion batteries containing silicon active anodes. A unique microstructure design is used to direct lithium …
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Oxyanion Adsorption by Iron and Ruthenium Oxides: A Macroscopic, Spectroscopic, and Kinetic Investigation
… surface complex with ruthenium oxide phases. Extended x-ray absorption fine structure spectroscopy and Pressure-jump relaxation studies indicates arsenate is specifically adsorbed the ruthenium oxide Chromate adsorption on ruthenium oxides was investigated as a function of pH and chromate …
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Alumina-supported palladium and palladium/copper catalysts: Characterization and use for selective hydrogenation of 1,3-butadiene
… decreases both surface adsorption and bulk absorption, suggesting surface decoration of Pd by Cu and possibly bulk Cu-Pd interactions in the supported bimetallic samples. Surface Cu-Pd mixing is confirmed by X-ray photoelectron spectroscopy (XPS) measurements. Extended X-ray absorption …
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Studies on the biotransformation of chromium (VI) by methane oxidising bacteria.
… coupled to inductively coupled plasma atomic absorption spectroscopy (ICP-MS), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDSX), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). The results indicate that …
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Exploitation of synergy in oxidation catalysis with bimetallic aluminophosphate catalysts
… electrochemical techniques including powder X-ray diffraction, diffuse reflectance UV/Visible spectroscopy, cyclic voltammetry, extended X-ray absorption fine structure, X-ray absorption near edge spectra, scanning electron microscopy and surface/elemental (BET and ICP) methods. A significant …
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A structural study of M-DNA
… The complex is thought to have a double helical structure that is similar to B-DNA. The presence of the divalent metal ions and a more compact structure may contribute to M-DNA’s remarkable ability to behave as a molecular wire. Because M-DNA is so similar to B-DNA, it adheres to the same rules …
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Ultrafast electron transfer and intersystem crossing in bimetallic molecules
… In this thesis, ultrafast optical and X-ray techniques are used to characterize the ET and ISC dynamics of a prototypical bimetallic FeIICoIII molecule following metal-to-metal charge transfer (MMCT) excitation. Femtosecond optical transient absorption (OTA) spectroscopy supported by …
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