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DTSTART;TZID=Europe/Paris:20261008T133000
DTEND;TZID=Europe/Paris:20261008T150000
DTSTAMP:20261002T091559Z
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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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