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DTSTART;TZID=Europe/Paris:20260528T110000
DTEND;TZID=Europe/Paris:20260528T123000
DTSTAMP:20260524T153235
CREATED:20260512T161545Z
LAST-MODIFIED:20260512T162314Z
UID:6152-1779966000-1779971400@www.cnrs-imn.fr
SUMMARY:Séminaire Babak Anasori
DESCRIPTION:Composition-Structure-Property Relationships in MXenes \n \nBabak ANASORI\nReilly Rising Star Associate Professor\nSchool of Materials Engineering and School of Mechanical Engineering\nPurdue University\, West Lafayette\, IN 47907\, USA\n \nMXenes are a large family of 2D transition metal carbides\, carbonitrides\, and nitrides with over 100 synthesized compositions to date. The rapid growth of the MXene family is driven by designer chemistry control of their composition and structure\, including the transition metal and surface functional groups\, the non-metal sublattice\, and atomic-layer configurations. This compositional diversity controls chemical ordering\, defect formation\, and surface chemistry\, ultimately determining MXenes properties. In addition to their chemical and structural diversity\, as-synthesized MXenes exhibit high electrical conductivity\, hydrophilicity\, functionalized surfaces\, and tunable electronic\, chemical\, and mechanical properties. \nIn this talk\, I will start with a brief overview of the possible compositions and structures of MXenes\, then focus on our recent efforts on medium- and high-entropy MXenes and defect engineering to control stability\, phase transformation\, and functional properties. I will discuss our work on the transition from order to disorder at sub-nanometer thicknesses across 40 different MXenes with two to nine transition metals due to entropy effects. I will also present how controlling defects\, including metal and non-metal vacancies and carbon substitution with nitrogen\, enables tuning of oxidation resistance\, electrocatalytic behavior\, and high-temperature stability. \n  \nBio:Dr. Babak Anasori is the Reilly Rising Star Associate Professor at Purdue University\, with joint appointments in the Schools of Materials Engineering and Mechanical Engineering. He also serves as the Editor-in-Chief of Graphene and 2D Materials\, a Springer-Nature journal. Dr. Anasori received his PhD from Drexel University in 2014 in the Department of Materials Science and Engineering\, the birthplace of MXenes. Dr. Anasori has authored over 210 refereed publications on MXenes and their precursors and has been recognized as a Web of Science Highly Cited Researcher since 2019. He has received several international awards\, including the 2016 Materials Research Society (MRS) Postdoctoral Award\, the 2021 Drexel University 40-under-40\, the 2021 Waterloo Institute for Nanotechnology (WIN) Rising Star Award in Nanoscience and Nanotechnology\, the 2024 Early Discovery Award by the American Ceramic Society (ACerS)\, the 2024 Kavli Foundation Early Career Lectureship in Materials Science by MRS\, and the 2026 Purdue University Faculty Excellence Award for Early Career Research. Dr. Anasori’s research lab focuses on developing novel 2D carbide and carbonitride MXenes for various applications\, including energy generation\, electromagnetic interference shielding\, and ultra-high temperature and extreme environments. \n  \nContact : Philippe Moreau (ST2E)
URL:https://www.cnrs-imn.fr/event/seminaire-babak-anasori/
LOCATION:Amphi IMN
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/05/Anasori_Babak.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260604T143000
DTEND;TZID=Europe/Paris:20260604T160000
DTSTAMP:20260524T153235
CREATED:20260416T143002Z
LAST-MODIFIED:20260417T101111Z
UID:5910-1780583400-1780588800@www.cnrs-imn.fr
SUMMARY:Séminaire Mathieu G. Silly
DESCRIPTION:Soft X‑ray High‑Resolution and Time‑Resolved Photoemission: Surface Chemistry and Charge Dynamics in Photoactive Materials \n \nMathieu G. SILLY\nTEMPO Beamline\, Synchrotron SOLEIL\, France \nPhotoactive materials — from transition‑metal oxides to semiconductors and hybrid heterostructures — exhibit complex surface and interface phenomena that critically govern their optical\, catalytic\, and electronic performance. Understanding the interplay between surface chemistry\, defects\, and charge dynamics\, over timescales ranging from a few tens of picoseconds up to one second\, is essential for elucidating their photoactivity. \nHigh‑resolution photoemission spectroscopy (HRPES) provides chemical selectivity and surface sensitivity\, enabling the identification of oxidation states\, defects\, and interfacial electronic structures. When combined with time‑resolved photoemission spectroscopy (TRPES)\, this approach allows direct observation of fast picosecond‑scale dynamics — such as charge transfer and optically induced electronic relaxation — as well as slower nanosecond‑to‑second processes\, including trap‑mediated recombination\, surface photovoltage relaxations\, or charge drift on mesoscopic scales. \nThese multi‑timescale capabilities are particularly relevant for systems such as hematite under environmental conditions\, passivated silicon surfaces\, or colloidal nanoparticles coupled to oxides\, where simultaneous insight into local chemistry and transient charge dynamics is crucial. \nThe TEMPO beamline at the SOLEIL synchrotron\, dedicated to high‑resolution core‑level photoemission and pump–probe experiments over the ps–s temporal range\, provides a unique platform for probing light–matter interactions with both chemical and temporal sensitivity. The combination of HRPES and TRPES thus offers a powerful framework to unravel the mechanisms governing photoactivity and to guide the design of more efficient and durable photoactive materials. \n  \nContact : Mireille Richard-Plouet (PCM)
URL:https://www.cnrs-imn.fr/event/seminaire-mathieu-g-silly/
LOCATION:Amphi IMN
ATTACH;FMTTYPE=image/png:https://www.cnrs-imn.fr/wp-content/uploads/2026/04/Silly_Mathieu.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260609T140000
DTEND;TZID=Europe/Paris:20260611T140000
DTSTAMP:20260524T153235
CREATED:20260413T124103Z
LAST-MODIFIED:20260413T124103Z
UID:5761-1781013600-1781186400@www.cnrs-imn.fr
SUMMARY:Congrès JEELS
DESCRIPTION:
URL:https://www.cnrs-imn.fr/event/congres-jeels/
LOCATION:Amphi IMN
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260611T133000
DTEND;TZID=Europe/Paris:20260611T150000
DTSTAMP:20260524T153235
CREATED:20260520T161228Z
LAST-MODIFIED:20260520T161942Z
UID:6180-1781184600-1781190000@www.cnrs-imn.fr
SUMMARY:Séminaire Jeudis de la Chimie du Solide - Céline Barreteau (ICMPE Thiais)
DESCRIPTION:Criblage de nouveaux composés intermétalliques thermoélectriques en couplant calculs à haut-débit et apprentissage automatique \n \nCéline Barreteau \nICMPE\, CNRS-UMR 7182\, 2-4 rue Henri Dunant\, 94320\, Thiais \nDans le contexte économique et écologique actuel\, le développement de production alternative d’énergie est un enjeu majeur. Dans cette optique\, les matériaux thermoélectriques\, qui permettent de convertir un flux de chaleur en gradient de température (et inversement)\, présentent de nombreux avantages : pas de pièces mobiles\, grande fiabilité\, …. Ils sont cependant encore cantonnés à des applications de niches du fait de leurs coûts élevés de production et leurs rendements faibles. De nouveaux matériaux hautes performances sont donc nécessaires pour accroitre l’utilisation de cette technologie. \nPour faciliter et accélérer la recherche de nouveaux candidats\, une double approche\, combinant calculs premiers principes et expérimentations\, est intéressante. Notre méthode associe\, pour un large panel de compositions\, des calculs à haut-débit\, permettant de mettre en évidence des composés stables et non métalliques\, à l’étude expérimentale des matériaux criblés les plus prometteurs. \nDans un premier temps\, nous nous sommes concentrés sur les composés intermétalliques ternaires T-M-X\, avec T un métal de transition\, une terre rare ou un métal alcalino-terreux\, M un élément de la première ligne des métaux de transition et X\, un élément sp [1\,2]. Ainsi\, pour des dizaines de prototypes\, toutes les combinaisons T-M-X possibles ont été étudiées par des calculs DFT. Après ce criblage théorique\, des investigations expérimentales ont été menées pour confirmer les résultats théoriques\, notamment concernant la stabilité et les propriétés thermoélectriques [3]. \nA présent\, dans notre quête de nouveaux matériaux plus prometteurs\, nous continuons d’améliorer notre méthode de criblage afin de complexifier et d’augmenter le type de composés tout en réduisant le nombre et la durée des calculs. Dans cette optique\, des techniques d’apprentissage automatique (Machine Learning) ont été appliquées à certains prototypes intermétalliques\, comme les Heuslers pour optimiser notre criblage [4]. \n  \n______________________ \n[1] Barreteau\, C. et al.\, Optimization of criteria for an efficient screening of new thermoelectric compounds: the TiNiSi structure-type as a case-study\, ACS Combinatorial Sciences\, 22\, 813-820\, (2020)\, https://doi.org/10.1021/acscombsci.0c00133 \n[2] Barreteau\, C. et al.\, Looking for new thermoelectric materials among TMX intermetallics using high-throughput calculations\, Computational Material Science\, 156\, 96-103 (2019)\, http://doi.org/10.1016/j.commatsci.2018.09.030 \n[3] Moll\, A. et al.\, SrCuP and SrCuSb Zintl phases as potential thermoelectric materials\, J. All. Comp.\, 924\, 169123 (2023) https://doi.org/10.1016/j.jallcom.2023.169123 \n[4] Xie\, R. et al.\, Screening new quaternary semiconductor Heusler compounds by machine-learning methods\, Chem. Mater. \, 35\, 7615-7627 (2023) https://doi.org/10.1021/acs.chemmater.3c01323 \n  \n 
URL:https://www.cnrs-imn.fr/event/seminaire-jeudis-de-la-chimie-du-solide-celine-barreteau-icmpe-thiais/
LOCATION:Visioconférence
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/05/Celine_Barreteau.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260722T140000
DTEND;TZID=Europe/Paris:20260722T153000
DTSTAMP:20260524T153235
CREATED:20260520T163136Z
LAST-MODIFIED:20260520T163311Z
UID:6196-1784728800-1784734200@www.cnrs-imn.fr
SUMMARY:Séminaire Romain Berthelot
DESCRIPTION:Solid-state design of crystalline alkali-mixed layered compounds \n \nRomain BERTHELOT \nInstitut Charles Gerhardt de Montpellier\, CNRS\, UM\, ENSCM\, France \nSolid-state chemists have long explored alkali transition metal layered compounds as a playground for discovering new compositions and tuning crystal structures and physical or electrochemical properties. In these materials\, cation substitution within the transition metal layers is generally facilitated by the similar ionic radii of many elements in octahedral coordination. By contrast\, modifying the interlayer space is far more constrained\, as differences in size and site symmetry hinder the incorporation of multiple alkali elements. \nHere\, we show that these limitations can be overcome through carefully designed synthesis strategies. A range of layered oxides and sulfides is explored\, yielding new mixed-alkali compositions with two distinct cation distributions: either a disordered arrangement within a single interlayer or an ordered stacking of chemically distinct alkali layers. \nResolving these complex structures remains a central challenge\, particularly with regard to locating alkali ions and accounting for stacking defects. To address this\, we combine complementary techniques: X-ray and neutron powder diffraction to probe long-range order\, alongside high-resolution transmission electron microscopy and solid-state NMR to access local structural environments. Density functional theory calculations further rationalize the stability of the observed arrangements. \nTogether\, these results uncover new structural motifs in layered materials and provide guidelines for the targeted design of mixed-alkali transition metal layered compounds. \n \nContact : Romain Wernert/Thierry Brousse (ST2E)
URL:https://www.cnrs-imn.fr/event/seminaire-romain-berthelot/
LOCATION:Amphi IMN
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/05/Romain_Berthelot.jpg
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