A5002675127- Nuclear Physics and Applications
- Hydraulic Fracturing and Reservoir Analysis
- Hydrocarbon exploration and reservoir analysis
- Drilling and Well Engineering
- Rock Mechanics and Modeling
- Geotechnical Engineering and Soil Mechanics
- Granular flow and fluidized beds
- Geophysical Methods and Applications
- NMR spectroscopy and applications
- Seismic Imaging and Inversion Techniques
- Fire effects on concrete materials
- Advanced X-ray and CT Imaging
- Landslides and related hazards
- Geotechnical and Geomechanical Engineering
- Concrete Properties and Behavior
- Engineering and Material Science Research
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Non-Destructive Testing Techniques
- Geophysical and Geoelectrical Methods
- Soil and Unsaturated Flow
- Tunneling and Rock Mechanics
- Advancements in Battery Materials
- Machine Learning in Materials Science
- Atomic and Subatomic Physics Research
Institut Laue-Langevin
2017-2025
Sols, Solides, Structures, Risques
2016-2025
Centre National de la Recherche Scientifique
2014-2025
Université Grenoble Alpes
2015-2025
Institut polytechnique de Grenoble
2013-2025
Institut Universitaire de France
2019-2025
Institut Langevin
2022-2023
Laboratoire des Écoulements Géophysiques et Industriels
2018-2021
The University of Sydney
2012-2016
Université Joseph Fourier
2013-2014
à la diffusion de documents scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement et recherche français étrangers, laboratoires publics privés.
Abstract The temporally and spatially resolved tracking of lithium intercalation electrode degradation processes are crucial for detecting understanding performance losses during the operation lithium-batteries. Here, high-throughput X-ray computed tomography has enabled identification mechanical in a commercial Li/MnO 2 primary battery indirect diffusion; furthermore, complementary neutron identified direct diffusion process wetting by electrolyte. Virtual unrolling techniques provide...
The electrochemical reduction of CO2 is a pivotal technology for the defossilization chemical industry. Although pilot-scale electrolyzers exist, water management and salt precipitation remain major hurdle to long-term operation. In this work, we present high-resolution neutron imaging (6 μm) zero-gap electrolyzer uncover distribution under application-relevant operating conditions (200 mA cm-2 at cell voltage 2.8 V with Faraday efficiency CO 99%). Precipitated salts penetrating cathode gas...
NeXT-Grenoble is a Neutron and X-ray Tomograph launched from the collaboration between Universite Grenoble Alpes (UGA) Institut Laue Langevin (ILL). The design started in February 2016 shortly followed by its construction at ILL. A first version of instrument has been opened to users since October 2016. One peculiarities that, as suggested name, allows acquisition truly simultaneous tomographies, taking advantage high complementarity these two beams. Also virtue uniquely flux ILL, can...
This paper explains why the critical state of sand is non-unique when expressed in terms stress and void ratio only. For this purpose, a thermodynamically consistent, micromechanically inspired constitutive modelling framework with competing grain crushing dilation developed. While described through theory breakage mechanics, modelled novel way by acknowledging its negative contribution to overall positive rate dissipation. The competition between underpinned yields unique space stress,...
Corrosion of reinforcing bars constitutes the largest threat to durability concrete structures. Thus, several studies have investigated nature corrosion products, most using post-mortem analyses. However, products evolve when in contact with oxygen, hindering result interpretation. This work presents instead a state-of-the-art, non-destructive 3D method for assessment embedded reinforcements. Multimodal neutron and X-ray tomography was used observe, non-destructively, characteristics two...
Abstract The elucidation of lithium ion transport pathways through a solid electrolyte separator is vital step toward development reliable, functional all‐solid‐state batteries. Here, advantage has been taken the significantly higher neutron attenuation coefficient one most abundant stable isotopes lithium, 6 Li, with respect to that naturally occurring isotope mixture, perform imaging on purpose built lithium–sulfur battery. Increasing Li content in anode while using natural and cathode...
Here, we report on a new record in the acquisition time for fast neutron tomography. With an optimized imaging setup, it was possible to acquire single radiographic projection images with 10 ms and full tomographies 155 projections physical spatial resolution of 200 µm within 1.5 s. This is about 6.7 times faster than current record. We used technique investigate water infiltration soil living lupine root system. The setup will be part future NeXT instrument at ILL Grenoble great field applications.
Abstract High‐speed neutron tomographies (1‐min acquisition) have been acquired during water invasion into air‐filled samples of both intact and deformed (ex situ) Vosges sandstone. Three‐dimensional volume images processed to detect track the evolution waterfront calculate full‐field measurement its speed advance. The flow process correlates well with known rock properties is especially sensitive distribution altered associated observed localized deformation, which independently...
The Callovo-Oxfordian claystone is a material with notoriously complex hydro-mechanical behaviour. Combined neutron and x-ray tomography modalities are used for the first time to characterise dynamics of water absorption in this by comparing deformation as well arrival. Exploiting recent work on multimodal registration, datasets registered pairwise into common coordinate system, meaning that vector-valued field (\textit{i.e.} reconstructed values) available each timestep, essentially making...
Dry cathode operation is a desired mode in anion-exchange membrane water electrolyzers to minimize contamination of the generated hydrogen. However, management under such conditions makes it challenging maintain reliable performance and durability. Here, we utilize high-resolution situ neutron imaging (∼6 μm effective resolution) analyze content inside membrane-electrode-assembly an electrolyzer. The ion-exchange capacity (IEC) thus hydrophilicity polymer binder catalyst layer varied study...
A large and increasing number of scientific domains pushes for high neutron imaging resolution achieved in reasonable times. Here we present the principle, design performance a detector based on infinity corrected optics combined with crystalline Gd3Ga5O12 : Eu scintillator, which provides an isotropic sub-4 µm true resolution. The exposure times are only few minutes per image. This is made possible also by uniquely intense cold flux available at beamline NeXT-Grenoble. These comparatively...
Abstract This paper proposes a first attempt to formulate constitutive model for Lightweight - Cemented Soils (LWCS). The formulation, developed in the framework of Thermodynamics with Internal Variables, relies on proper choice key internal variable capable accounting macroscopic mechanical effects peculiar microstructure this artificial material. is formulated based results an experimental investigation response LWCS specimens carried out under triaxial loading paths complemented by...
Abstract Fiber orientation plays a key role in fiber reinforcement. Fibers must undergo tensile stress to be effective and oriented along the minimum principal direction ensure maximum interaction with shear band. When fibers are well oriented, during shearing, porosity strain fields more homogeneous specimen, band thickness is larger. The present study focused on detection of mechanism between sand grains fibers, link behavior observed at macroscale microscale. An investigation soil-fibers...
Abstract In the present work, in-situ x-ray microtomography, i.e. , scanning acquired during mechanical loading, on Lightweight Cemented Soils (LWCS) samples is performed in order to obtain direct three-dimensional observations of foam-induced porosity changes under triaxial loading paths. This novel experimental campaign consists three tests at different confining stress levels, ranging from 50 kPa up 500 kPa. The results show that, by increasing confinement level, initial stiffness sample...
Abstract Understanding the hydromechanical behavior of porous media such as sandstones is critical to various geoengineering applications geologic carbon storage, geothermal projects, oil and gas production environmental remediation in aquifers. In these contexts, accurate quantification constitutive necessary predict reservoir responses. this work, neutron tomography data were acquired during coupled triaxial-flow tests on Idaho Gray sandstone cores characterize full-field response. The...