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The CoWork webinar series is dedicated to the exploitation of the coherence properties of X-rays for advanced materials characterization, with a special focus on inverse microscopy techniques, such as Coherent Diffraction Imaging (CDI), Ptychography and Holography. It is an introduction to Coherent X-ray imaging methods to facilitate the access to advanced microscopy techniques to new users and it welcomes all researchers intrigued by the spectacular coherence properties of X-rays produced at modern synchrotron sources – of which MAX IV is a first example.
When: Thursday March 10, 15.30 - 16.30
Speaker: Marie-Ingrid Richard, CEA, Grenoble, France
Title: Structural evolution of nanoparticles under realistic conditions observed with Bragg coherent x-ray imaging
Bio:
Marie-Ingrid Richard is a researcher at CEA-Grenoble within the Grenoble Interdisciplinary Research Institute (IRIG). She is also a visiting scientist at the ID01 beamline of the European Synchrotron Radiation Facility (ESRF). Her current research focuses on the study of the structure of nano-materials during reaction/operation thanks to the development of new X-ray diffraction techniques: fast pole figure acquisition, focused nano beam X-ray diffraction and coherent (resonant) X-ray diffraction.
She obtained her PhD in condensed matter physics from Joseph Fourier University (Grenoble, France) in 2007. She used state-of-the-art setups for in situ study of nano-materials growth under X-ray beams at ESRF and Advanced Photon Source (APS-USA). From the end of 2008 to the end of 2019, she worked at the University of Aix-Marseille and at the IM2NP laboratory as an associate professor on the structural characterization of nanostructures. Recently, she joined CEA-Grenoble to continue her research work. She is a laureate of a European ERC project which aims at imaging in three dimensions the structure of nano-catalysts during their reaction.
Abstract:
The advent of the world’s first coherent hard X-ray sources represents an unprecedented opportunity to conduct in situ and operando studies on the structure of nanoparticles in reactive liquid or gas environments. In this talk, I will illustrate how Bragg coherent x-ray imaging allows to image in three dimensions (3D) and at the nanoscale the strain and defect dynamics inside nanoparticles as well as their refaceting during (electro-)catalytic reactions. I will also highlight the potential of machine learning to predict characteristic structural features in nanocrystals just from their 3D Bragg coherent diffraction patterns.
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Please contact either gerardina.carbone@maxiv.lu.se or asa.grunning@linxs.lu.se for any questions.
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