A5061063917- Radioactive element chemistry and processing
- Nuclear Materials and Properties
- X-ray Spectroscopy and Fluorescence Analysis
- X-ray Diffraction in Crystallography
- Cultural Heritage Materials Analysis
- Advanced Fluorescence Microscopy Techniques
- Spaceflight effects on biology
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Building materials and conservation
- Geochemistry and Geologic Mapping
- Crystallization and Solubility Studies
- Nuclear materials and radiation effects
- Catalytic Processes in Materials Science
- Glass properties and applications
- Metal Extraction and Bioleaching
- Graphene research and applications
- Tardigrade Biology and Ecology
- Advanced Nanomaterials in Catalysis
- Geological and Geochemical Analysis
- Conservation Techniques and Studies
- Machine Learning in Materials Science
- Extraction and Separation Processes
- Catalysis and Oxidation Reactions
- Analytical Chemistry and Sensors
Helmholtz-Zentrum Dresden-Rossendorf
2019-2024
European Synchrotron Radiation Facility
2015-2024
Ghent University
2014-2020
European Science Foundation
2019
Ghent University Hospital
2014-2016
Extremely defect graphene oxide (dGO) is proposed as an advanced sorbent for treatment of radioactive waste and contaminated natural waters. dGO prepared using a modified Hummers oxidation procedure, starting from reduced (rGO) precursor, shows significantly higher sorption U(VI), Am(III), Eu(III) than standard oxides (GOs). Earlier studies revealed the mechanism radionuclide related to defects in GO sheets. Therefore, explosive thermal exfoliation graphite was used prepare rGO with large...
X-ray absorption experiments at Ce L<sub>3</sub> and M<sub>5</sub> edges theoretical calculations demonstrate that in addition to the nanoceria charge stability, formation of hydroxyl groups surface affects chemical performance nanomaterials.
Abstract The writing in carbonized Herculaneum scrolls, covered and preserved by the pyroclastic events of Vesuvius 79 AD, was recently revealed using X-ray phase-contrast tomography, without need unrolling sensitive scrolls. Unfortunately, some text is difficult to read due interference papyrus fibers crossing written vertically horizontally. Recently, lead found as an elemental constituent writing, rendering more clearly readable when monitoring fluorescence signal. Here, several...
The nanoscience field often produces results more mystifying than any other discipline. It has been argued that changes in the plutonium dioxide (PuO2) particle size from bulk to nano can have a drastic effect on PuO2 properties. Here we report full characterization of nanoparticles (NPs) at atomic level and probe their local electronic structures by variety methods available synchrotron.
Many studies report the synthesis and characterizations of CeO2 nanoparticles (NPs) due to their applications in catalysis, energy storage, or biomedical fields. In this study, we a comprehensive interpretation X-ray measurements on series oxo-hydroxo polynuclear Ce complexes whose atomic structures are resolved. The set investigated samples represent formation small from few ions. Such clusters might serve as good building blocks nanoscale architectures, many together may perform highly...
Abstract The key to fabricating complex, hierarchical materials is the control of chemical reactions at various length scales. To this end, classical model nucleation and growth fails provide sufficient information. Here, we illustrate how modern X-ray spectroscopic scattering in situ studies bridge molecular- macro- scales for assemblies polyhedrally shaped CoO nanocrystals. Utilizing high energy-resolution fluorescence-detected absorption spectroscopy, directly access molecular level...
Abstract Here preparation of high surface area activated reduced graphene oxide (arGO) oxidized into a 3D analogue defect‐rich GO (dGO) is reported. Surface oxidation arGO results in carbon to oxygen ratio C/O = 3.3, similar the state while preserving BET about 880 m 2 g −1 . Analysis shows abundance functional groups which converts hydrophobic precursor hydrophilic material. High carbons provide whole for without need intercalation and lattice expansion. Therefore, methods are sufficient...
Reaction of the N-heterocylic carbene ligand
The analytical characterization and an application example of a novel laboratory X-ray fluorescence (μXRF) microprobe is presented, which combines monochromatic, focused beam excitation with high-performance silicon drift detector (SDD) two-dimensional/three-dimensional (2D/3D) scanning capability. Because the monochromatic excitation, below (multiple) Compton/Rayleigh scattering peak region, XRF spectra obtained by this spectrometer has similarly high peak-to-background ratios as those can...
X-ray absorption near-edge structure (XANES) spectroscopy is a well-known nondestructive technique that allows for chemical state and local determination. Spatially resolved oxidation imaging possible performing full-field transmission mode XANES experiments, providing information on the illuminated sample area, but these experiments are limited to thin, concentrated samples. Here we present use of unique energy dispersive (ED) pnCCD detector, SLcam, fluorescence thereby significantly...
We show that the structural and electronic properties of UO<sub>2</sub>NPs (2–3 nm) are similar to those bulk UO<sub>2</sub>under inert conditions, with U(<sc>iv</sc>) as dominating oxidation state, though NPs oxidize time under X-ray beam.
In this work, the capabilities and limitations of ns-LA-ICP-MS for bulk spatially resolved (elemental mapping) analysis iron meteorites were assessed.
Abstract We report on a radically new elemental imaging approach for the analysis of biological model organisms and single cells in their natural, vivo state. The methodology combines optical tweezers (OT) technology non-contact, laser-based sample manipulation with synchrotron radiation confocal X-ray fluorescence (XRF) microimaging first time. main objective this work is to establish method two-dimensional (2D) projection mode free-standing microorganisms or cells, present aqueous...
A novel plug-and-play setup based on polycapillary X-ray optics enables three-dimensional (3D) confocal fluorescence (XRF) and absorption spectroscopy down to 8 × 11 μm3 (17 keV) at the European Synchrotron Radiation Facility Collaborative Research Group Dutch-Belgian Beamline, BM26A. complete description analytical characterization is presented, together with two recently performed experimental cases. In Deep Earth diamond São Luiz-Frankfurt am Main 16, an olivine-rich inclusion was mapped...
The aim of this study is to synthesize PuO2 nanoparticles (NPs) at low pH values and characterize the materials using laboratory synchrotron-based methods. Properties NPs formed under acidic conditions (pH 1-4) are explored here atomic scale. High-resolution transmission electron microscopy (HRTEM) applied crystallinity, morphology size particles. It found that 2 nm crystalline with a crystal structure. High energy resolution fluorescence detected (HERFD) X-ray absorption spectroscopy Pu M4...
UC and UMeC 2 (Me = Fe, Zr, Mo) carbides were studied by the high-energy-resolution fluorescence-detected X-ray absorption (HERFD-XAS) technique at U M 4 L 3 edges. Both HERFD-XAS reveal some differences between UC; there are also edge results for both types of carbide in terms spectral width energy position. The observed attributed to consequences 5 f , 6 d –4 (3 ) hybridization . Calculations spectra performed using Anderson impurity model (AIM). Based on analysis data, occupancy ground...
The chemical properties of actinide materials are often predefined and described based on the data available for isostructural species. This is case potassium plutonyl (PuVI) carbonate, K4PuVIO2(CO3)3(cr), a complex relevant nuclear technology environment, which crystallographic thermodynamic still lacking. We report here synthesis characterization PuVI achieved by single-crystal X-ray diffraction analysis high-energy-resolution fluorescence-detected absorption near-edge structure at Pu...
Recently, a radically new synchrotron radiation-based elemental imaging approach for the analysis of biological model organisms and single cells in their natural vivo state was introduced. The methodology combines optical tweezers (OT) technology non-contact laser-based sample manipulation with radiation confocal X-ray fluorescence (XRF) microimaging first time at ESRF-ID13. possibilities limitations organisms, OT setup developments XRF XRF-related challenges are reported. In general,...
Friedreich's ataxia (FRDA) is a neurodegenerative disease characterized by an increase in intracytoplasmic iron concentration. Here the nanoscale distribution within single fibroblasts from FRDA patients was investigated using synchrotron-radiation-based nanoscopic X-ray fluorescence and in-line holography at ID16A nano-imaging beamline of ESRF. This unique probe deployed to uncover cellular two-dimensional architecture freeze-dried fibroblasts. An unsurpassed absolute detection capability...
A multi-technique elemental and microphase analysis of altered granitic rock from the Krunkelbach Valley uranium deposit, Black Forest, Southern Germany.