BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//IMN - ECPv6.17.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:IMN
X-ORIGINAL-URL:https://www.cnrs-imn.fr
X-WR-CALDESC:Évènements pour IMN
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20270328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20271031T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261008T133000
DTEND;TZID=Europe/Paris:20261008T150000
DTSTAMP:20261002T091554Z
CREATED:20261002T085740Z
LAST-MODIFIED:20261002T091554Z
UID:7723-1791466200-1791471600@www.cnrs-imn.fr
SUMMARY:Séminaire Jeudis de la Chimie du Solide - Maurizio Cossi (University of Piemonte Orientale\, Italy)
DESCRIPTION:Towards a new description of the inner space of amorphous porous carbons \n \nMaurizio Cossi \nUniversity of Piemonte Orientale\, Italy \nVisio : https://univ-nantes-fr.zoom.us/j/84576001578?pwd=2yHtI3N2g2iNumDaXqYtyBMt4azR6A.1 \nAdsorption processes in nanoporous materials are of great importance in a number of fields\, involving gas storage\, separation and purification\, sensoring\, heterogeneous and hybrid catalysis\, and others. The knowledge of the materials structure\, and of its relation to adsorbent/adsorbate interactions\, strongly influence the interpretation of experimental results and the design of new\, more efficient adsorbents. \nThe description of the porous volume distributions and the measure of specific surface areas are extremely important in this framework. \nWe will rapidly review the modern techniques used to characterize the porous structure of various materials (activated carbons\, zeolites\, MOF etc.) along with the most recent theoretical methods that can support the experimental characterization. In particular\, we will present the newest computational approach PoLA (Porosity Local Analysis)\, designed to describe the porous volume and surface both in atomistic models and in real samples\, and to predict the adsorption properties. \n[1] A. Zoccante et al.\, ACS Omega 2025\, 10\, 31623 \n[2] M. Cossi et al.\, Carbon 2026\, 257\, 121713
URL:https://www.cnrs-imn.fr/event/seminaire-jeudis-de-la-chimie-du-solide-maurizio-cossi-university-of-piemonte-orientale-italy/
LOCATION:Visioconférence
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/10/Maurizio_Cossi.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261008T140000
DTEND;TZID=Europe/Paris:20261008T160000
DTSTAMP:20260930T185137Z
CREATED:20260930T171611Z
LAST-MODIFIED:20260930T185137Z
UID:7685-1791468000-1791475200@www.cnrs-imn.fr
SUMMARY:Séminaire Vladimir Pimonov
DESCRIPTION:Growth Kinetics and Structural Characterization of Carbon Nanotubes: From In Situ Observation to Raman Spectroscopy \n\nVladimir PIMONOV \nTeam Aggregates and Nanomaterials\, Institute of Light and Matter\, University Claude Bernard Lyon1 \nAbstract \nCarbon nanotubes (CNTs) remain a model system for studying the relationship between growth conditions\, structure\, and electronic properties. Their strong structure–property dependence makes control of synthesis a central challenge\, but understanding this control requires access not only to the final nanotube structure\, but also to the dynamics of its formation. This work combines in situ observation of individual single-walled CNT growth with automated image analysis and post-growth structural characterization. \nDuring my PhD\, in situ homodyne polarization microscopy was used to follow the growth of individual CNTs under CVD conditions. Deep-learning-based detection and tracking enabled high-throughput extraction of growth kinetics from low-contrast videos and revealed dynamic instabilities\, including transitions between distinct growth regimes. These kinetic measurements were correlated with Raman characterization of the same nanotubes\, providing a direct link between growth behavior and structure. The same framework also highlighted the importance of the substrate: Raman studies of individual CNTs grown on quartz showed that the measured vibrational response reflects not only intrinsic nanotube structure\, but also interactions with the local environment. \nMy latest postdoctoral work extends this approach to CNT growth under applied electric field\, using environmental TEM to observe growth directly at the nanoscale. Here again\, automated analysis is essential for extracting kinetic information from large video datasets and for identifying field-dependent changes in growth\, stability\, and failure mechanisms. Ongoing work combines these kinetic measurements with Raman-based structural analysis to examine how the electric field affects not only nanotube growth dynamics\, but also the resulting nanotube population. Together\, these studies illustrate how in situ microscopy\, data-driven image analysis\, and Raman spectroscopy can be combined to investigate the coupling between synthesis conditions\, environment\, growth kinetics\, and nanotube structure. \nContact : Chris Ewels (PMN)
URL:https://www.cnrs-imn.fr/event/seminaire-vladimir-pimonov/
LOCATION:Amphi IMN Lombarderie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/Vladimir_Pimonov.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261016T093000
DTEND;TZID=Europe/Paris:20261016T133000
DTSTAMP:20261001T135057Z
CREATED:20261001T122709Z
LAST-MODIFIED:20261001T135057Z
UID:7711-1792143000-1792157400@www.cnrs-imn.fr
SUMMARY:Soutenance de thèse d'Aline KNEUBL ANDREUSSI (ST2E)
DESCRIPTION:Influence de la structure chimique et macromoléculaire de liants polyacrylates sur la cyclabilité d’électrodes négatives riches en silicium pour batterie Li-ion\nRésumé : L’augmentation de la densité d’énergie des batteries lithium-ion nécessite le développement d’électrodes négatives de capacité supérieure à celle du graphite. Les composites SiOₓ/graphite sont prometteurs\, mais les variations de volume du SiOₓ au cours du cyclage provoquent des contraintes mécaniques\, une perte de connectivité électronique et une croissance continue de l’interphase électrolyte solide (SEI). Dans ce contexte\, le liant polymère est essentiel\, car il contrôle la mise en forme\, la cohésion\, l’adhésion et la stabilité de l’électrode. Cette thèse étudie l’influence de la structure chimique et macromoléculaire de liants polyacrylates sur des électrodes négatives SiOₓ/graphite riches en silicium. Les paramètres étudiés incluent le rapport acide acrylique/acrylate d’éthyle (AA/AE)\, l’incorporation de l’acide 2-acrylamido-2-méthylpropanesulfonique’AMPS\, le pH\, le cation de neutralisation\, la masse molaire et l’ajout de caoutchouc styrène-butadiene (SBR). Les électrodes ont été caractérisées par rhéologie\, MEB\, résistivité\, dosage de l’eau résiduelle\, tests mécaniques\, cyclage en demi-pile et RMN du solide post-mortem.\nLes résultats montrent que les fonctions carboxyliques/carboxylates issues de l’AA sont déterminantes pour les interactions avec le SiOₓ. Le copolymère 85%AA-15%AE neutralisé au sodium apparaît comme le meilleur compromis\, avec des performances proches du 100%AA\, une meilleure adhésion\, une plus faible teneur en eau et une formulation plus robuste. Sa pertinence a été confirmée dans des conditions plus applicatives : forte teneur en SiOₓ\, calandrage\, collecteurs alternatifs\, température\, pré-upscaling et recyclage exploratoire. \nMots clés : Batteries lithium-ion\, électrodes SiOx/graphite\, formulation\, liants polyacrylates \n\nInfluence of the chemical and macromolecular structure of polyacrylate binders on the cyclability of silicon-rich negative electrodes for Li-ion batteries\nAbstract: Increasing the energy density of lithium-ion batteries requires negative electrodes with higher capacity than graphite. SiOₓ/graphite composites are promising candidates\, but SiOₓ volume changes during cycling induce mechanical stress\, loss of electronic connectivity and continuous solid-electrolyte interphase (SEI) growth. In this context\, the polymer binder is a key component because it governs electrode processing\, cohesion\, adhesion and cycling stability. This thesis investigates the influence of the chemical and macromolecular structure of polyacrylate binders on silicon-rich SiOₓ/graphite negative electrodes. The studied parameters include the acrylic acid/ethyl acrylate ratio (AA/AE)\, 2-acrylamido-2-methylpropane sulfonic acid (AMPS) incorporation\, neutralization cation\, formulation pH\, molar mass and styrene-butadiene rubber (SBR) addition.\nThe electrodes were characterized by rheology\, SEM-EDX\, resistivity measurements\, residual water quantification\, mechanical testing\, half-cell cycling and post-mortem solid-state NMR. The results show that acrylic-acid-derived carboxylic/carboxylate groups are essential for maintaining interactions with SiOₓ particles. Among the investigated compositions\, the sodium-neutralized 85%AA-15%AE copolymer provides the best overall compromise\, with electrochemical performance close to 100%AA\, improved adhesion\, lower residual water content and better formulation robustness. Its practical relevance was further confirmed under more application-oriented conditions\, including higher SiOₓ content\, calendering\, alternative current collectors\, cycling temperature\, preliminary scale-up and exploratory electrode-scrap recycling. \nKeywords: lithium-ion batteries\, SiOₓ/graphite electrodes\, formulation\, polyacrylate binders
URL:https://www.cnrs-imn.fr/event/soutenance-de-these-de-aline-kneul-andreussinarivo-st2e/
LOCATION:Amphi IMN Lombarderie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/10/alineka_min.jpg
END:VEVENT
END:VCALENDAR