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Statut |
Confirmé |
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Série |
SEM-BESSON |
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Domaines |
cond-mat |
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Date |
Jeudi 29 Novembre 2012 |
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Heure |
10:00 |
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Institut |
IMPMC |
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Salle |
Salle de Conférence, 4ème étage, Tour 22-23, UPMC, 4, Place Jussieu |
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Nom de l'orateur |
Scheinost |
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Prenom de l'orateur |
Andreas |
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Addresse email de l'orateur |
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Institution de l'orateur |
Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiochemistry |
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Titre |
Uranium (and plutonium) at solid/water interfaces: lessons to be learned from x-ray absorption spectroscopy |
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Résumé |
X-ray absorption spectroscopy is a versatile tool to investigate oxidation state and molecular structure of uranium in aqueous and solid phases and at their common interface. However, the structural analysis is often hampered by limited resolution and range. I will show recent advances to overcome these limitations, including improved XAFS data analysis approaches like Monte-Carlo and Landweber methods and modern data mining methods; and coupling to XAFS-independent methods like DFT and surface complexation modeling.
I will demonstrate the usefulness of these methods by showing recent results on uranyl sorption to mineral surfaces, with a focus on polynuclear and carbonate complexes; Fe(II)-driven interfacial redox processes of uranyl, also in comparison to other actinoides; colloid formation processes of U(IV) and its tetravalent actinoide neighbors.
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Numéro de preprint arXiv |
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Commentaires |
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Fichiers attachés |
- seminSCHEINOST2012.pdf (120939 bytes)
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