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DTSTART;TZID=Europe/Paris:20220620T080000
DTEND;TZID=Europe/Paris:20220715T170000
DTSTAMP:20220620T075455Z
CREATED:20220620T075455Z
LAST-MODIFIED:20220620T075455Z
UID:23296-1655712000-1657904400@www.chimieparistech.psl.eu
SUMMARY:Oraux du CCMP
DESCRIPTION:
URL:https://www.chimieparistech.psl.eu/evenement-agenda/oraux-du-ccmp/
LOCATION:Chimie ParisTech – PSL\, 11\, rue Pierre et Marie Curie\, Paris\, 75005\, France
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220630T140000
DTEND;TZID=Europe/Paris:20220630T150000
DTSTAMP:20220629T113920Z
CREATED:20220622T131300Z
LAST-MODIFIED:20220629T113920Z
UID:23301-1656597600-1656601200@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Microfluidic osmotic compression of charge-stabilized colloidal dispersions: Equations of state and collective diffusion coefficients.\nAnnick Hallez\, Laboratoire de Génie Chimique\, Université de Toulouse. \nWhere : ESPCI\, Amphi Holweck. \nUsing a model coupling mass transport and liquid theory calculations for a charge-stabilized colloidal dispersion\, it is possible to show that diffusion significantly limits measurement times of equations of state (EOS)\, osmotic pressure vs composition\, using the osmotic compression technique. Following this result\, a microfluidic chip allowing one to measure the entire EOS of a charged dispersion at the nanoliter scale in a few hours is presented\, with precisely controlled pH and chemical potential of ions. It can be achieved by trapping a drop of colloidal suspension close to a semi-permeable membrane synthesized inside the chip\, and acting as a dialysis bag. We also show that time-resolved analyses of relaxation to equilibrium in this microfluidic experiment lead to direct estimates of the collective diffusion coefficient of the dispersion in Donnan equilibrium with a salt reservoir. The microfluidic chip acting as a “chemostat”\, it becomes possible to impose ramps of pH or salt chemical potential to the dispersion and to measure the dependence of the EOS (or a phase diagram) on these parameters easily. With an adequate model for electrostatic interactions\, inferring the charge regulation mechanisms at the surface of colloids in concentrated dispersions then becomes possible.
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-90/
LOCATION:ESPCI Paris\, 10 Rue Vauquelin\, Paris\, 75005\, France
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220630T140000
DTEND;TZID=Europe/Paris:20220630T150000
DTSTAMP:20220629T113324Z
CREATED:20220629T110233Z
LAST-MODIFIED:20220629T113324Z
UID:23318-1656597600-1656601200@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:From nanocrystals to earthquakes: Universal avalanche statistics across 12 decades in length?\n  \nKarin Dahmen\, Department of Physics\, University of Illinois at Urbana Champaign \nSlowly-compressed nano-crystals\, bulk metallic glasses\, high entropy alloys\, rocks\, granular materials\, and the earth all deform via intermittent slips or “quakes”. We find that although these systems span 12 decades in length scale\, they all show the same scaling behavior for their slip size distributions and other statistical properties. Remarkably\, the size distributions follow the same power law multiplied with the same exponential cutoff. The cutoff grows with applied force for materials spanning length scales from nanometers to kilometers\, indicating an underlying nonequilibrium phase transition. A simple mean field model for avalanches of slipping weak spots explains the agreement across scales. It predicts the observed slip-size distributions and the observed stress-dependent cutoff function. The analysis draws on tools from statistical physics and the renormalization group. The results enable extrapolations from one scale to another\, and from one force to another\, across different materials and structures\, from nanocrystals to earthquakes. Connections to neuron avalanches in the brain will also be discussed. \nWhere : \n\nESPCI Room Boreau\, building C\, 2nd floor\nZoom link: https://espci.zoom.us/j/87125746129?pwd=T2dxZnB5Z3dNaFNGY0lrVVdyVThVZz09\nID: 871 2574 6129\nPassword: G.Charpak\n\nContact/to subscribe or unsubscribe: seminaires-lpem@espci.fr
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-93/
LOCATION:ESPCI Paris\, 10 Rue Vauquelin\, Paris\, 75005\, France
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
ORGANIZER;CN="Karin Dahmen":MAILTO:dahmen@illinois.edu
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