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Ce contenu n'est pas disponible en français.News & Scientific Highlights
Une simulation pour faire avancer les travaux de déblaiement à Fukushima
Une nouvelle simulation des débris radioactifs les plus dangereux de la centrale nucléaire de Fukushima devrait faire avancer les travaux de déblaiement.
Direct observation of crack formation mechanisms with operando Laser Powder Bed Fusion X-ray radiography
Operando high-speed X-ray radiography experiments reveal the cracking mechanism during 3D laser printing of a Ni superalloy.
Full-field X-ray absorption tomography reveals the chemical structure of defects in metal-organic frameworks
Cryo-full-field XANES computed tomography was used to visualize the presence and distribution of a second coordination polymer of reduced copper coordination within defect-engineered HKUST-1 MOF crystals. Observations encourage a revisitation of the structure-property relationships of defect-engineered MOFs.
Comment les catalyseurs vieillissent
La structure du matériau utilisé dans les catalyseurs en industrie chimique se modifie au fil des ans. Des chercheurs du PSI ont étudié ce phénomène au moyen d’une nouvelle méthode.
Vue en trois dimensions de l’intérieur de catalyseurs actifs
La spectroscopie de rayons X in operando permet de jeter un coup d’œil à l’intérieur de réacteurs chimiques en fonction. Des chercheurs de l’Institut de technologie de Karlsruhe (KIT), à l’Institut Paul Scherrer PSI et à l’European Synchrotron Radiation Facility (ESRF) en France, appliquent avec succès cette méthode.
Operando X-ray diffraction during laser 3D printing
Ultra-fast operando X-ray diffraction experiments reveal the temporal evolution of low and high temperature phases and the formation of residual stresses during laser 3D printing of a Ti-6Al-4V alloy. The profound influence of the length of the laser-scanning vector on the evolving microstructure is revealed and elucidated.
Inside Batteries
Lithium ion batteries (LIB) are essential in modern everyday life, with increasing interest in enhancing their performance and lifetime. Secondary particles of Li-rich cathode material were examined with correlated ptychographic X-ray tomography and diffraction microscopy at different stages of cycling to probe the aging mechanism.
Moving Atoms by Photodoping
Understanding how and how fast we can drive atoms to create a structural phase transition is of fundamental interest as it directly relates to many processes in nature. Here we show that a photoexcitation can drive a purely structural phase transition before the energy is relaxed in the material that corresponds to a “warmer” equilibrated state.
Active Sites of supported bimetallic nano-Catalysts
Dynamic Structural Changes of Active Sites in Pt–Ni Bimetallic Catalysts Revealed by a Multimodal Approach