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DTSTART;TZID=Europe/Paris:20261008T133000
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DTSTAMP:20261002T091554Z
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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
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DTSTART;TZID=Europe/Paris:20261008T140000
DTEND;TZID=Europe/Paris:20261008T160000
DTSTAMP:20261007T151101Z
CREATED:20260930T171611Z
LAST-MODIFIED:20261007T151101Z
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 \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 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:Visioconférence
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/09/Vladimir_Pimonov.jpg
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