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DTSTART;TZID=Europe/Paris:20260623T100000
DTEND;TZID=Europe/Paris:20260623T110000
DTSTAMP:20260529T152039Z
CREATED:20260529T151847Z
LAST-MODIFIED:20260529T152039Z
UID:10000179-1782208800-1782212400@sfp-alpes.fr
SUMMARY:Cyril BRESSY (Aix-Marseille Université - Institut des Sciences Moléculaires de Marseille (iSm2))
DESCRIPTION:Compartmentalized MultiCatalysis : Chirality as Probe\, Separation of Enantiomers & Catalytic Active Transport\nRésumé : \nLife solves the problem of different reaction conditions by the compartmentalization of the catalytic systems. This solution opens new opportunities for the chemists using synthetic membranes to isolate the catalytic systems. \nWe were interested to study the diffusion of molecules through a semi-permeable membrane when no gradient of concentration does exist. Chirality was found to be helpful to be used as probe to study such systems (1). A scale of diffusion energy depending on the structure of the solute was established providing fruitful lessons. \nBased on these results\, compartmentalized multicatalytic systems were set up for different goals : \n– A system where two catalysts of opposite configurations are working in each compartment leading to the physical separation of enantiomeric products starting from a racemic substrate. This is describing a case of compartmentalized parallel kinetic resolution (CPKR)(2).\n– A system to promote the active transport of a molecule able to cross a membrane. The active transport means a transfer against the gradient of concentration (3). \nReferences \n1 .  J. Hou\, S. Chevallier-Michaud\, L. Favre\, D. Hérault & C. Bressy\, J. Membrane Sci. 2026\, in revision.\n2  . a) J. Hou\, S. Chevallier-Michaud\, M. Jean\, L. Favre\, D. Hérault & C. Bressy\, J. Am. Chem. Soc. 2023\, 145\, 27236-27241; b) J. Hou\, D. Hérault\, C. Bressy\, “Method for simultaneous preparation of separated enantiomeric products from racemic substrates”\, Extension internationale PCTEP2022085983 (2022) WO2023126186A1.\n3 . Manuscript in preparation \n_ \nContact : adrien.quintard@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/cyril-bressy-aix-marseille-universite-institut-des-sciences-moleculaires-de-marseille-ism2/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260623T110000
DTEND;TZID=Europe/Paris:20260623T120000
DTSTAMP:20260326T142357Z
CREATED:20260326T142350Z
LAST-MODIFIED:20260326T142357Z
UID:10000111-1782212400-1782216000@sfp-alpes.fr
SUMMARY:Lucas GOEHRING (Nottingham Trent University (UK))
DESCRIPTION:Structure formation in paints and coatings\nRésumé : \nPaints and coatings are typically a mix of small particles\, like pigments\, along with a polymer glue or binder. Similar products include inks\, varnishes\, cosmetics\, ceramics and even the lithium-ion battery electrodes that power modern electric vehicles. These materials are prepared as a liquid\, spread over a surface\, and dried.  As anyone who has painted a wall will know\, however\, this process can easily go wrong. Even a well-prepared paint can develop an undesirable skin and wrinkle\, crack\, or peel\, and these coatings can also visibly degrade over time. \nIn this talk I will go through the key stages of film formation\, or how a colloidal dispersion dries.  I will show how small angle scattering experiments (SANS/SAXS) helped to elucidate how the structure of the film changes during drying\, evolving from a dilute gas of particles\, into a transient gel where capillary pressures balance electrostatic repulsion\, to a final aggregated solid. I will then turn to look at how the insight gained has led to a better understanding of mechanical instabilities like fracture\, shear banding\, birefringence\, and peeling\, as well as revealing an unexpected route to colloidal crystallisation. \nFinally\, I will summarise our recent work using neutron scattering techniques to investigate blanching\, a degradation process that can cause a visible whitening in the traditional varnishes that are used as a protective outer coating on many historically and artistically important paintings. \nSpeaker’s website: https://www.ntu.ac.uk/staff-profiles/science-technology/lucas-goehring \n— \nOrsolya Czakkel (College 9 Secretary) \nExternal visitors may ask for a site access to tellier@ill.fr \nZoom link: https://ill.zoom.us/j/95581858117?pwd=hh9paEQj6BF8u9WYzfZkvZaGspe1i3.1  – Passcode: 078610 \n 
URL:https://sfp-alpes.fr/event/lucas-goehring-nottingham-trent-university-uk/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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