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DTSTART;TZID=Europe/Paris:20261008T133000
DTEND;TZID=Europe/Paris:20261008T150000
DTSTAMP:20261002T091559Z
CREATED:20261002T085740Z
LAST-MODIFIED:20261002T091559Z
UID:7728-1791466200-1791471600@www.cnrs-imn.fr
SUMMARY:"Solid-State Chemistry Thursdays" Seminar - Maurizio Cossi (University of Piemonte Orientale\, Italy)
DESCRIPTION:Toward a New Description of the Internal Structure of Amorphous Porous Carbons \n \nMaurizio Cossi \nUniversity of Eastern Piedmont\, Italy \nVideo: 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\, including gas storage\, separation\, and purification; sensing; heterogeneous and hybrid catalysis; and others. Knowledge of the material’s structure and its relationship to adsorbent-adsorbate interactions strongly influences the interpretation of experimental results and the design of new\, more efficient adsorbents.  \nThe description of the porous volume distributions and the measurement of specific surface areas are extremely important in this context. \nWe will briefly review the modern techniques used to characterize the porous structure of various materials (activated carbons\, zeolites\, MOFs\, etc.)\, along with the most recent theoretical methods that can support experimental characterization. In particular\, we will present the newest computational approach\, PoLA (Porosity Local Analysis)\, designed to describe the porous volume and surface in both atomistic models and real samples\, and to predict 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/en/event/solid-state-chemistry-thursdays-seminar-maurizio-cossi-university-of-piemonte-orientale-italy/
LOCATION:Videoconferencing
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/10/Maurizio_Cossi.jpg
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DTSTART;TZID=Europe/Paris:20261008T140000
DTEND;TZID=Europe/Paris:20261008T160000
DTSTAMP:20261007T151108Z
CREATED:20260930T171611Z
LAST-MODIFIED:20261007T151108Z
UID:7690-1791468000-1791475200@www.cnrs-imn.fr
SUMMARY:Vladimir Pimonov Seminar
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\, Claude Bernard University Lyon 1 \n\nZoom: https://univ-nantes-fr.zoom.us/j/87228058575 \n\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 controlling the synthesis a key 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 Ph.D.\, in situ homodyne polarization microscopy was used to track 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 the intrinsic nanotube structure but also interactions with the local environment.    \nMy latest postdoctoral work extends this approach to CNT growth under an 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 interplay between synthesis conditions\, the environment\, growth kinetics\, and nanotube structure.    \nContact: Chris Ewels (PMN)
URL:https://www.cnrs-imn.fr/en/event/vladimir-pimonov-seminar/
LOCATION:Videoconferencing
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/Vladimir_Pimonov.jpg
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DTSTART;TZID=Europe/Paris:20261016T093000
DTEND;TZID=Europe/Paris:20261016T133000
DTSTAMP:20261001T135103Z
CREATED:20261001T122709Z
LAST-MODIFIED:20261001T135103Z
UID:7718-1792143000-1792157400@www.cnrs-imn.fr
SUMMARY:Thesis Defense by Aline KNEUBL ANDREUSSI (ST2E)
DESCRIPTION:Effect of the Chemical and Macromolecular Structure of Polyacrylate Binders on the Cyclability of Silicon-Rich Anodes for Lithium-Ion Batteries\nAbstract: The increase in the energy density of lithium-ion batteries requires the development of anode electrodes with a higher capacity than graphite. SiOₓ/graphite composites show promise\, but volume changes in SiOₓ during cycling cause mechanical stress\, a loss of electronic connectivity\, and continuous growth of the solid electrolyte interphase (SEI). In this context\, the polymer binder is essential\, as it controls the electrode’s shape\, cohesion\, adhesion\, and stability. This thesis investigates the influence of the chemical and macromolecular structure of polyacrylate binders on silicon-rich SiOₓ/graphite anodes. The parameters studied include the acrylic acid/ethyl acrylate (AA/AE) ratio\, the incorporation of 2-acrylamido-2-methylpropanesulfonic acid (AMPS)\, pH\, the neutralizing cation\, molar mass\, and the addition of styrene-butadiene rubber (SBR). The electrodes were characterized by rheology\, SEM\, resistivity\, residual water content analysis\, mechanical testing\, half-cell cycling\, and post-mortem solid-state NMR.\nThe results show that the carboxylic/carboxylate groups derived from AA are critical for interactions with SiOₓ. The sodium-neutralized 85% AA–15% AE copolymer appears to be the best compromise\, with performance close to that of 100% AA\, better adhesion\, lower water content\, and a more robust formulation. Its suitability was confirmed under more application-oriented conditions: high SiOₓ content\, calendering\, alternative collectors\, temperature\, pre-upscaling\, and exploratory recycling.        \nKeywords: Lithium-ion batteries\, SiOx/graphite electrodes\, formulation\, polyacrylate binders \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 volume changes in SiOₓ 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 anodes. The parameters studied include the acrylic acid/ethyl acrylate ratio (AA/AE)\, incorporation of 2-acrylamido-2-methylpropane sulfonic acid (AMPS)\, neutralization cation\, formulation pH\, molar mass\, and addition of styrene-butadiene rubber (SBR).\nThe electrodes were characterized using 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 balance\, with electrochemical performance close to that of 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/en/event/thesis-defense-by-aline-kneubl-andreussi-st2e/
LOCATION:Amphi IMN Lombarderie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/10/alineka_min.jpg
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