Book ChapterDOI
X-Ray Absorption Spectroscopy
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In this article, the authors reviewed recent progress in applications of X-ray absorption spectroscopy to the study of clays and clay minerals, including the use of scan-transmission X-Ray microscopy (STXM) for the analysis of cation exchange in smectite, dissolution reactions in wet samples and to determine the amount of tetrahedral Fe in biogenic iron oxides.Abstract:
This chapter reviews recent progress in applications of X-ray absorption spectroscopy to the study of clays and clay minerals. Scanning transmission X-ray microscopy (STXM) has been shown to be a versatile tool, useful for the study of cation exchange in smectite, dissolution reactions in wet samples and to determine the amount of tetrahedral Fe in biogenic iron oxides. STXM image analysis lends itself well to statistical analyses developed in the biological sciences. Other soft and hard X-ray absorption spectroscopies have continued to play important roles in quantifying the relative proportions of cation coordination and oxidation state in oxides, smectites and other layered minerals.read more
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Book ChapterDOI
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References
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Journal ArticleDOI
Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure
TL;DR: In this paper, a selfconsistent real-space multiple-scattering (RSMS) approach for calculations of x-ray-absorption near-edge structure (XANES) is presented and implemented in an ab initio code applicable to arbitrary aperiodic or periodic systems.
Journal ArticleDOI
Measurement of co-localization of objects in dual-colour confocal images
TL;DR: The co‐localization coefficients can provide relevant quantitative information about the positional relation between biological objects or processes, and are tested on images of real biological specimens.
Journal ArticleDOI
Oxidation state and coordination of Fe in minerals: An Fe K-XANES spectroscopic study
Max Wilke,François Farges,François Farges,Pierre-Emmanuel Petit,Gordon E. Brown,François Martin +5 more
TL;DR: In this paper, the authors measured high-resolution Fe K-edge XANES spectra of a series of crystalline Fe 2+ - and Fe 3+ -bearing model compounds in an effort to correlate characteristics of the pre-edge feature with oxidation state and local coordination environment of Fe atoms.
Journal ArticleDOI
Uranium(VI) adsorption to ferrihydrite: Application of a surface complexation model
TL;DR: In this paper, a study of U(VI) adsorption by ferrihydrite was conducted over a wide range of U (VI) concentrations, pH, and at two partial pressures of carbon dioxide.
Journal ArticleDOI
The Structure of Ferrihydrite, a Nanocrystalline Material
F. Marc Michel,Lars Ehm,Sytle M. Antao,Peter L. Lee,Peter J. Chupas,Gang Liu,Daniel R. Strongin,Martin A.A. Schoonen,Brian L. Phillips,John B. Parise +9 more
TL;DR: Real-space fitting indicates structural relaxation with decreasing particle size and also suggests that second-order effects such as internal strain, stacking faults, and particle shape contribute to the PDFs.