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DTSTART;TZID=Europe/Paris:20260908T140000
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DTSTAMP:20260901T101238Z
CREATED:20260901T094217Z
LAST-MODIFIED:20260901T101238Z
UID:7205-1788876000-1788883200@www.cnrs-imn.fr
SUMMARY:Alfonso Carrillo Seminar
DESCRIPTION:Toward the Compositional Optimization of Multicomponent Exsolved Metallic Nanoparticles from Perovskite Electrodes \n\nAlfonso J. CARRILLO  \nInstitute of Chemical Technology (Polytechnic University of Valencia – Spanish National Research Council)\, Spain \nBio\nDr. Alfonso J. Carrillo holds a degree in Chemical Engineering from the University of Salamanca\, a master’s degree in Renewable Energy from the University of León\, and a Ph.D. in Chemical Engineering from Rey Juan Carlos University. After completing his doctoral research at IMDEA Energy\, he held postdoctoral positions at ETH Zurich (Switzerland) and the Massachusetts Institute of Technology (USA)\, where he was an Eni-MIT Energy Fellow. He has received several awards and fellowships\, including recognition as a Chemical Communications Emerging Investigator 2024\, a Leonardo Grant from the BBVA Foundation\, a Junior Leader Fellowship from the “la Caixa” Foundation\, a Juan de la Cierva Fellowship\, and a research grant from the Iberdrola Foundation.   \nHe is currently a tenured scientist at the Spanish National Research Council (CSIC)\, based at the Institute of Chemical Technology (ITQ) in Valencia\, where he conducts research as part of the Energy Conversion and Storage Group. His research focuses on the development of redox materials for energy applications\, with a particular emphasis on thermochemical energy storage and renewable fuel production.  \nAbstract \nThe exsolution of metallic nanoparticles from perovskite oxides is a promising method for producing highly dispersed and stable catalysts through annealing in H₂-containing atmospheres. These nanoparticles remain anchored to the oxide surface\, preventing sintering and enhancing resistance to carbon deposition\, which leads to superior long-term catalytic performance compared to conventional noble metal-supported systems. Moreover\, compositional tuning of the host oxide enables the controlled exsolution of alloy nanoparticles with unique electrocatalytic properties. However\, managing the exsolution of multiple cations requires careful control of processing conditions and fine-tuning of the B-site composition. This is primarily due to the varying reducibility of each element (following Ellingham trends)\, which significantly influences the subsequent concentration of each constituent in the exsolved nanoparticle.     \nOur group has spent the last few years studying multicomponent exsolution using Sr₂Fe₁.₅Mo₀.₅O₆₋δ-based perovskites as a platform. First\, because these materials serve as excellent electrodes for solid oxide electrochemical cells. Second\, this class of perovskites can readily accommodate multiple cations substituting Fe at the B-site\, facilitating the exsolution of multicomponent nanoparticles. We initially investigated the exsolution of Ni-Co-Fe multicomponent alloys. By optimizing the microstructure and fine-tuning the exsolution treatment parameters\, we achieved functionalization with ternary alloy nanoparticles (~10 nm) that previously demonstrated excellent performance in CO₂ electrolysis\, with high Faradaic efficiency and low polarization resistance. Here\, we demonstrate that adjusting the gas atmosphere\, temperature\, and pressure allows for further control of nanoparticle composition. Notably\, high-pressure exsolution (up to 100 bar) revealed a volcano-like dependence of both the extent of exsolution and the alloy composition on pressure. We also show that redox cycling under atmospheric pressure modifies surface chemistry\, leading to Fe enrichment. Lastly\, we explore temperature effects on Cu-Co-Fe-Ni exsolution\, identifying conditions that favor the formation of Janus-type nanoparticles\, primarily driven by the low miscibility of Cu and metallic Fe. Interestingly\, these phase-separated Janus-type nanoparticles significantly alter the reversibility of exsolution in this system\, leading to the formation of pyramidal NiO nanoparticles instead of complete redissolution.          \nFinally\, we reveal how adjusting the composition of these multielemental exsolved nanoparticles (via phase separation or Fe enrichment) affects the catalytic properties of these materials\, directing reactions toward targeted products. These results highlight the potential and versatility of multicomponent nanoparticle exsolution in (electro)catalytic processes for renewable fuel production.  \n  \nContact: Clément Nicollet (ST2E)
URL:https://www.cnrs-imn.fr/en/event/alfonso-carrillo-seminar/
LOCATION:Amphi IMN Lombarderie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/Alfonso-Carrillo.jpg
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DTSTART;TZID=Europe/Paris:20260910T133000
DTEND;TZID=Europe/Paris:20260910T150000
DTSTAMP:20260901T154444Z
CREATED:20260901T152907Z
LAST-MODIFIED:20260901T154444Z
UID:7242-1789047000-1789052400@www.cnrs-imn.fr
SUMMARY:"Solid-State Chemistry Thursdays" Seminar - Pauline Martinetto (UGA / Néel Institute\, CNRS-UGA)
DESCRIPTION:Physicochemical Analyses of Ancient and Cultural Heritage Materials: From Non-Invasive Measurements on Artworks to Semi-Automated Quantitative Phase Analysis \n \nPauline Martinetto \nUGA / Néel Institute\, CNRS-UGA Grenoble \nVideo: https://univ-nantes-fr.zoom.us/s/88629102497 \nCultural heritage materials are increasingly the focus of interdisciplinary research programs\, in which the approaches of the various disciplines involved are combined with the goal of tracing the history of works of art\, from their creation and manufacture to their current state of deterioration. At the Institut Néel\, we seek to develop X-ray analysis methods to reveal the traces recorded in these materials in order to identify the raw materials\, their composition\, and\, if possible\, their provenance and the technical expertise involved.  \nIn this presentation\, I will discuss the analytical approach we have recently developed\, which combines non-invasive fluorescence spectroscopy and X-ray diffraction measurements performed directly on the artworks with synchrotron diffraction mapping and tomography experiments on micro-samples. The use of these synchrotron imaging techniques results in the collection of massive amounts of data\, which has led us to develop rapid\, semi-automated processing methods that allow us to obtain quantitative information at every point in the image\, which are particularly informative for understanding complex pictorial stratigraphies. I will illustrate our approach by presenting various examples\, drawn in particular from the interdisciplinary PATRIMALP program (IDEX\, UGA)\, and will focus specifically on the studies we have conducted on the polychromy of late-Medieval sculptures and manuscripts.
URL:https://www.cnrs-imn.fr/en/event/solid-state-chemistry-thursdays-seminar-pauline-martinetto-uga-neel-institute-cnrs-uga/
LOCATION:Videoconferencing
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/Pauline_Martinetto.jpg
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DTSTART;TZID=Europe/Paris:20260911T143000
DTEND;TZID=Europe/Paris:20260911T163000
DTSTAMP:20260901T143424Z
CREATED:20260901T100405Z
LAST-MODIFIED:20260901T143424Z
UID:7216-1789137000-1789144200@www.cnrs-imn.fr
SUMMARY:Talita Mazon Seminar
DESCRIPTION:Engineering Functional Materials for Real-World Applications: Biosensing\, Gas Sensing\, and Energy Storage \n\nTalita MAZON \nCTI – Renato Archer Information Technology Center (CTI)\, Campinas\, São Paulo\, Brazil \nBio\nDr. Talita Mazon is a Senior Researcher at the Renato Archer Information Technology Center (CTI) in Brazil\, with a background in chemistry (B.S. – 1994\, M.S. – 1997\, and Ph.D. – 2001) and expertise in materials science and nanotechnology. Her research focuses on the design and synthesis of advanced functional materials\, including nanostructured metal oxides\, ceramic systems\, and carbon-based composites. She has extensive experience in developing electrochemical biosensors for the detection of clinically relevant biomarkers\, as well as in integrating these materials into portable\, low-cost diagnostic platforms. She has authored over 45 scientific publications in peer-reviewed journals. Her work also encompasses energy storage and environmental applications\, including nanomaterials for gas sensors\, supercapacitors\, and photocatalytic systems for pollutant degradation. Prof. Mazon has coordinated and participated in several national and international research projects and collaborates closely with academic and industrial partners. Her research aims to bridge the gap between fundamental materials development and real-world technological applications\, contributing to innovation in health\, environmental solutions\, and energy.         \nAbstract \nThis talk will present recent advances in the design and engineering of functional materials for real-world applications\, with a focus on biosensing\, gas sensing\, and energy storage. The work highlights the development of nanostructured materials—including metal oxides\, carbon-based composites\, and hybrid nanoarchitectures—tailored to achieve enhanced electrical\, catalytic\, and surface properties.  \nIn the field of biosensing\, emphasis will be placed on integrating these materials into electrochemical platforms for the detection of clinically relevant biomarkers\, enabling sensitive\, low-cost\, and portable diagnostic solutions. Strategies such as surface engineering\, nanoheterojunction design\, and the use of catalytic nanomaterials will be discussed as key approaches to improving sensitivity\, selectivity\, and stability.  \nFor gas-sensing applications\, the presentation will explore the use of semiconductor metal oxides and nanostructured heterojunctions for the detection of gases and volatile organic compounds (VOCs). Particular attention will be given to the role of morphology control and surface functionalization\, as well as to strategies for enhancing selectivity and response under real operating conditions.  \nIn the field of energy storage\, this presentation will address recent advances in the development of biochar-based nanostructured materials for supercapacitors\, focusing on improving charge storage capacity\, cycling stability\, and energy density through controlled composition and architecture. \nOverall\, the talk will explore the challenges and opportunities involved in translating functional materials from laboratory-scale research to practical applications\, with a focus on scalability\, sustainability\, and the development of cost-effective technologies that have a real societal impact. \n  \nContact: Mireille Richard-Plouet (PCM)
URL:https://www.cnrs-imn.fr/en/event/talita-mazon-seminar/
LOCATION:Amphi IMN Lombarderie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/Talita_Mazon.jpg
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20261002
DTEND;VALUE=DATE:20261005
DTSTAMP:20260911T133530Z
CREATED:20260911T124304Z
LAST-MODIFIED:20260911T133530Z
UID:7414-1790899200-1791158399@www.cnrs-imn.fr
SUMMARY:Science Festival 2026
DESCRIPTION:The IMN looks forward to seeing you at the 2026 Science Festival! \nThis year’s theme: Sophisticated Flavors \nOctober 2–4 at the Dobré Museum \nThe IMN is offering brand-new workshops on nutrition: \n\nFood Rheology\nInfrared Spectroscopy for Food Quality Analysis\nFood Packaging Materials\nMeasuring pH Using Cabbage Leaves\nViewing Certain Foods Under a Microscope\n\nTo learn more about the Dobré Museum’s Science Village \nContact: jeremy.barbe@cnrs-imn.fr\, sandrine.perruchas@cnrs-imn.fr \n \n  \n 
URL:https://www.cnrs-imn.fr/en/event/science-festival-2026/
LOCATION:Dobré Museum
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/FDS26_affiche_agenda_web.jpg
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