Maxime Dupraz
I am a beamline scientist, currently working at the French-CRG beamline BM02-D2AM hosted by the ESRF. This beamline, operated by a CEA
and CNRS consortium, is dedicated to in situ and operando structural studies using anomalous Wide Angle X-ray Scattering (WAXS) and Small Angle X-ray Scattering (SAXS).
In the past decade, I have been trying to understand the interplay between the microstructure and physical properties of a large range metallic samples. To do so, I am relying predominantly on two tools:
synchrotron X-ray diffraction techniques (50+ synchrotron beamtimes in the past 10 years) coupled with in situ and operando environments and large-scale Molecular Dynamics simulations.
My recent research activities relied on this combined experimental/modeling approach to investigate in situ and operando the structural evolution of catalytic nanoparticles during reaction.
Currently I bring my expertise in synchrotron diffraction techniques and in coherent X-ray scattering to explore and develop the use of coherence on the D2AM beamline through collaborations with various research
institutes.
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Anomalous Glide Plane in Platinum Nano- and Microcrystals
Marie-Ingrid Richard, Stéphane Labat, Maxime Dupraz, Jérôme Carnis, Lu Gao, Michaël Texier, Ni Li,
Longfei Wu, Jan P. Hofmann, Mor Levi, Steven J. Leake, Sergey Lazarev, Michael Sprung,
Emiel J.M. Hensen, Eugen Rabkin, and Olivier Thomas
ACS Nano, 2023
By using Bragg Coherent Diffraction Imaging (BCDI), we reveal uncover unusual slip activity occurring on {110}
glide planes in submicrometer Pt crystals.
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Imaging the Breathing of a Platinum Nanoparticle in Electrochemical Environment
Clément Atlan, Corentin Chatelier, Isaac Martens, Maxime Dupraz, Arnaud
Viola, Ni Li, Lu Gao, Steven J. Leake, Tobias U. Schülli, Joël Eymery, Frédéric
Maillard, and Marie-Ingrid Richard
Nature Materials, 2023
arXiv
We exploit coherent diffraction at the new 4th generation Extremely Brilliant Source at the European Synchrotron Radiation
Facility (ESRF-EBS) to map and quantify strain inside individual Pt catalyst nanoparticles under electrochemical control
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Imaging the facet surface strain state of supported multi-faceted Pt nanoparticles during reaction
Maxime Dupraz, Ni Li, Jérôme Carnis, Longfei Wu, Stéphane Labat, Corentin Chatelier,
Rim van de Poll, Jan Philipp Hofmann, Ehud Almog, Steven J. Leake, Yves Watier,
Serguei Lazarev, Fabian Westermeier, Michael Sprung, Emil J. M. Hensen, Olivier Thomas,
Eugen Rabkin and Marie-Ingrid Richard
Nature Communications 13, 2022
HAL
We use BCDI during CO oxidation to understand the facet dependent strain evolution in Pt nanoparticles
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A convolutional neural network for defect classification in
Bragg coherent X-ray diffraction
Bruce Lim*, Ewen Bellec*, Maxime Dupraz*, Steven J. Leake, Andrea Resta,
Alessandro Coati, Michael Sprung, Ehud Almog, Eugen Rabkin, Tobias Schulli and Marie-Ingrid Richard
*co first-authors
npj computational materials 7, 2021
arXiv
In this work, we exploit a computational tool based on a three-dimensional (3D) parametric atomistic model and a convolutional neural network to predict dislocations in a crystal from its 3D coherent diffraction pattern.
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Deciphering the interactions between single arm dislocation
sources and coherent twin boundary in nickel bi-crystal
Vahid Samaee, Maxime Dupraz, Thomas Pardoen, Helena Van Swygenhoven,
Dominique Schryvers and Hosni Idrissi
Nature Communications 12, 2021
We reveal new interactions mechanisms between screw dislocations and a Σ3 Coherent Twin Boundary in a sub-micron Ni bi-crystal using
in situ Transmission Electron Microscopy and atomistic simulations
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Bragg coherent imaging of nanoprecipitates: role of superstructure reflections
Maxime Dupraz, Steven J. Leake, Marie-Ingrid Richard
Journal of Applied Crystallography 53, 2021
arXiv
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HAL
We carry out a detailed numerical analysis which demonstrates the relevance of BCDI for the imaging of coherent
precipitates and more generally ordered phases
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Continuous scanning for Bragg coherent X‑ray imaging
Ni Li, Maxime Dupraz, Longfei Wu, Steven J. Leake, Andrea Resta,
Jérôme Carnis, Stéphane Labat, Ehud Almog, Eugen Rabkin, Vincent Favre-Nicolin,
Frédéric-Emmanuel Picca, Felisa Berenguer, Rim van de Poll, Jan P. Hofmann, Alina Vlad,
Olivier Thomas, Yves Garreau, Alessandro Coati and Marie-Ingrid Richard
Scientific Reports 10, 2020
HAL
We explore the use of continuous scanning during data acquisition for Bragg coherent diffraction imaging
, i.e., where the sample is in continuous motion.
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Response surface for screw dislocation: Twin boundary interactions in FCC metals
Satish I. Rao, Maxime Dupraz, Chris Woodward, Triplicane A. Parthasarathy
Acta Materialia 195, 2020
We present an analytic mechanistic model that reproduces accurately atomistic simulations results for the transmission mechanisms
and critical transmission stress of a screw dislocation across Σ3 coherent twin boundary in Al, Ni and Cu.
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Large scale 3-dimensional atomistic simulations of screw dislocations interacting with coherent twin boundaries in Al,
Cu and Ni under uniaxial and multiaxial loading conditions
Maxime Dupraz, Satish I. Rao, Helena Van Swygenhoven
Acta Materialia 174, 2019
We use large scale 3D atomistic simulations to study the influence of multiaxial stresses on the interaction between
a curved dislocation and a Σ3 coherent twin boundary in Al, Ni and Cu.
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Dislocation interactions at reduced strain rates in atomistic simulations of nanocrystalline Al.
Maxime Dupraz, Zhen Sun, Christian Brandl, Helena Van Swygenhoven
Acta Materialia 144, 2018
We carry out Molecular dynamics simulations of transient stress drops in different regimes on a
nanocrystalline Aluminium sample. We reveal new deformation mechanisms associated to the low strain rate of the simulation
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3D Imaging of a Dislocation Loop at the Onset of Plasticity in an Indented Nanocrystal.
Maxime Dupraz, Guillaume Beutier, Thomas W. Cornelius, Guillaume Parry, Zhe Ren,
Stéphane Labat, Marie-Ingrid Richard, Gilbert A. CHahine, Oleg Kovalenko, Marc De Boissieu,
Eugen Rabkin, Marc Verdier and Olivier Thomas
Nano Letters 17, 2017
HAL
We use Bragg Coherent Diffraction Imaging to reveal in 3D the evolution of the microstructure of a nanocrystal exosed to
in situ mechanical loading.
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Identifying Defects with Guided Algorithms in Bragg Coherent Diffractive Imaging.
Andrew Ulvestad, Youssef Nashed, Guillaume Beutier,
Marc Verdier, Stephan O. Hruszkewycz and Maxime Dupraz
Scientific Reports 7, 2017
We use numerical simulations to explore different guided phase retrieval algorithms for imaging defective crystals using BCDI
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A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing.
Steven Van Petegem, Antoine Guitton, Maxime Dupraz, Alex Bollhalder,
Karl Sofinowski, Manas V. Upadhyay and H. Van Swygenhoven
Experimental Mechanics 7, 2017
HAL
We present a novel miniaturized biaxial deformation rig which allows to apply in-plane biaxial stress states and to
perform strain path changes on thin-sheet materials
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Wetting layer of copper on the tantalum (001) surface.
Maxime Dupraz, Roberta Poloni, Kitti Ratter, David Rodney,
Maurizio De Santis, Bruno Gilles, Guillaume Beutier and Marc Verdier
Physical Review B 7, 2016
HAL
We combine Surface X-ray Diffraction measurements and Density Functional Theory Calculation to reveal the structure of the
Cu-Ta(0 0 1) interface.
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Signature of dislocations and stacking faults of face-centred cubic nanocrystals in coherent X-ray diffraction patterns: a numerical study.
Maxime Dupraz, Guillaume Beutier, David Rodney, Dan Mordehai and Marc Verdier
Journal of Applied Crystallography 48, 2015
HAL
We carry out a detailed numerical analysis to reveal the signature of individual crystal defects in
Coherent X-ray Diffraction Patterns in the vicinity of allowed Bragg reflections.
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Inversion Domain Boundaries in GaN Wires Revealed by Coherent Bragg Imaging.
Stéphane Labat, Marie-Ingrid Richard, Maxime Dupraz, Marc Gailhanou, Guillaume Beutier,
Marc Verdier, Francesca Mastropietro, Thomas W. Cornelius, Tobias U. Schülli,
Joël Eymery, and Olivier Thomas
ACS Nano 9, 2015
HAL
We reveal the microscopic configuration of Inversion Domain Boundaries inside n-doped gallium nitride wires
by Bragg Coherent Diffraction imaging.
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Holographic imaging of interlayer coupling in Co/Pt/NiFe.
Thomas A. Duckworth, Feodor Y. Ogrin, Guillaume Beutier, Sarnjeet S Dhesi, Stuart A Cavill, Sean Langridge,
Amy Whiteside, Thomas Moore, Maxime Dupraz, Flora Yakhou
New Journal of Physics 15, 2013
HAL
We present a method to determine the magnetic configuration of an in-plane magnetized permalloy layer using
Fourier transform holography with extended references in an off-normal geometry.
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