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X-ORIGINAL-URL:https://www.chimieparistech.psl.eu
X-WR-CALDESC:Évènements pour Chimie ParisTech - PSL
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210906T113000
DTEND;TZID=Europe/Paris:20210906T123000
DTSTAMP:20210902T090526Z
CREATED:20210902T090526Z
LAST-MODIFIED:20210902T090526Z
UID:22106-1630927800-1630931400@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Zero group velocity and backward elastic guided modes in homogeneous media  \nClaire Prada and Alexandre Delory \nIn elastic waveguides\, the coupling between shear and compression waves results in complex dispersion effects. Indeed\, negative phase velocity modes are observed in most waveguides like plates\, tubes or ribbons. These modes\, called ‘backward’\, appear when two branches of neighbouring cut-off frequencies repel each other which can result in a Dirac cone if cut-off frequencies coincide. For low damping material\, the minimum frequency of the backward branches corresponds to zero group velocity (ZGV) modes that are associated with narrow local resonances. These resonances are very interesting to evaluate local properties like thickness or Poisson’s ratio. The remarkable properties of negative phase velocity modes and ZGV resonances will be described through direct non-contact measurements on stiff materials using a nanosecond laser ultrasonic technique in the MHz frequency range.  Then\, the existence of backward modes in soft viscoelastic material will be discussed and illustrated through experiments achieved in the 1 to 100 Hz frequency range using digital image correlation method. Besides\, the anisotropy induced by a large static uniaxial strain will be discussed and non-linear elasticity will be considered to model the evolution of mode dispersion.   \n[1]    Laurent\, Royer\, Prada\, « Temporal behavior of local plate resonances »\, Wave Motion\, (2014) \n[2]    Gérardin\, Laurent\, Legrand\, Prada\, and Aubry\, « Negative reflection of elastic guided waves in chaotic and random scattering media »\, Scientific Reports\, (2019). \n[3]    Lanoy\, Lemoult\, Eddi\, Prada\, « Dirac cones and chiral selection of elastic waves in a soft strip »\, PNAS (2020) \n\n \n \n\nGulliver is inviting you to a scheduled Zoom meeting.\n \nTopic: Gulliver Seminar\, Monday 11h30\n \nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/89298327378?pwd=cFFac0MzYzVJb1MyRWdRRTRpR2J3UT09\n \nMeeting ID: 892 9832 7378\nPasscode: 523230\n \nFind your local number: https://us02web.zoom.us/u/klgwTHIaJ\n 
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-38/
LOCATION:Visioconférence
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210909T080000
DTEND;TZID=Europe/Paris:20211025T170000
DTSTAMP:20210902T083011Z
CREATED:20210902T083011Z
LAST-MODIFIED:20210902T083011Z
UID:22090-1631174400-1635181200@www.chimieparistech.psl.eu
SUMMARY:Rentrée 2021 : PSL Antropocène
DESCRIPTION:  \nA la rentrée universitaire 2021\, l’Université PSL propose\, en s’appuyant sur l’engagement de ses étudiantes et étudiants\, de mettre en avant la thématique de l’anthropocène dans le cadre d’un cycle de conférences et de divers événements ouverts à toutes et tous. \nRetrouvez tous les détails ici
URL:https://www.chimieparistech.psl.eu/evenement-agenda/rentree-2021-psl-antropocene/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210910T140000
DTEND;TZID=Europe/Paris:20210910T150000
DTSTAMP:20210906T140722Z
CREATED:20210906T140722Z
LAST-MODIFIED:20210906T140722Z
UID:22124-1631282400-1631286000@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Thermoluminescence\, a tool to control defects in materials  \nBruno Viana (bruno.viana@chimieparistech.psl.eu) \nIRCP Chimie-Paristech\, Paris\, France  \nScientific Seminar   \nFriday 10th of September 2:00 PM Room Prefabriqué 1 at Chimie ParisTech – PSL \n  \n  \nThermoluminescence or thermally stimulated luminescence is a perfect tool to characterize the defects in the luminescent materials. In general\, defects should be limited in the Optical Materials as defects decreased the light yield and could give some afterglow for instance in bioimaging. In contrary\, for some important applications such as datation\, dosimetry and persistent luminescence it is important to control the depths of the traps. This seminar will present the use of different strategies and the use of the thermoluminescence in several domains.  \n 
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-39/
LOCATION:Préfabriqué 1\, 11 rue Pierre et Marie Curie\, Paris\, France
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
ORGANIZER;CN="Bruno Viana":MAILTO:bruno.viana@chimieparistech.psl.eu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210913T113000
DTEND;TZID=Europe/Paris:20210913T123000
DTSTAMP:20210910T125538Z
CREATED:20210910T125403Z
LAST-MODIFIED:20210910T125538Z
UID:22141-1631532600-1631536200@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:On wrinkles\, and what they have to do with liquid crystals\nA thin elastic sheet attached to a soft substrate often develops wrinkle patterns when subject to an external forcing or as a result of geometric incompatibility. Such patterns appear spontaneously in a variety of natural systems\, ranging from plant tissues to drying paint and from milk skin to human skin. The interplay between elasticity and substrate response favors\, at short length scales\, a pattern of straight equally spaced wrinkles. This locally preferred order\, akin to a two-dimensional smectic liquid crystal\, is often in conflict with a large-scale geometric mismatch or a global constraint. The competition gives rise to a wide variety of complex wrinkle patterns\, where different intermediate-scale motifs may dominate at different parameter regimes. Among these motifs one finds smooth distortions of the local ground state\, proliferation of point defects accompanied by amplitude variations\, and sharply defined domains separated by thin domain walls. In this talk I will present a description of wrinkling pattern based on a coarse-grained energy functional. I will point to the smectic-resembling terms in this effective model\, their impact and their geometry-induced interaction with the remaining terms\, that are associated with large-scale distortions. I will discuss how the variety of pattern motifs and transitions can be understood through their analogous liquid crystalline phases and phase transitions. I will demonstrate several possible applications of this new understanding of wrinkles.\n\n********************************\nSujet : Gulliver seminar Hillel  Aharoni\nHeure : 13 sept. 2021 11:30 AM Paris\n\nParticiper à la réunion Zoom\nhttps://cnrs.zoom.us/j/94883254836 \nID de réunion : 948 8325 4836\nCode secret : aKh5DE
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-42/
LOCATION:Visioconférence
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210917T103000
DTEND;TZID=Europe/Paris:20210917T113000
DTSTAMP:20210909T154516Z
CREATED:20210909T154516Z
LAST-MODIFIED:20210909T154516Z
UID:22136-1631874600-1631878200@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:The next CMC seminar will be held on September 17th (10.30 am) in room Génome with a presentation from Erica Benedetti (Université de Paris). The title and abstract can be found below.\n \nPresentation title: Synthesis and applications of planar chiral [2.2]paracyclophanes\n \nAbstract: Originally discovered in a serendipitous fashion by vapour phase pyrolysis of p-xylene\, [2.2]paracyclophane (pCp) and its derivatives have rapidly gained popularity amongst chemists due to their unique three-dimensional architecture that can give rise to planar chirality. Despite their broad range of applications\, optically active paracyclophanes are currently still mainly obtained through enantiomers separation by chromatography on chiral stationary phases. The optimization of new asymmetric processes providing a practical access to chiral pCps can therefore be considered as a priority in modern cyclophane chemistry.\nWe have developed a general approach based on asymmetric transfer hydrogenations (ATH) for controlling the planar chirality of a range of substituted [2.2]paracyclophanes. Our strategy enables us to perform both the kinetic resolution of racemic compounds and the desymmetrization of centrosymmetric meso derivatives on synthetically useful scales. The obtained enantioenriched derivatives\, which incorporate different reactive groups on each ring of the pCp core\, can be used as key intermediates for the preparation of new circularly polarized light emitting dyes (CPL). Based on its broad applicability\, we are convinced our method will reveal to be an extremely useful tool to rapidly access complex planar chiral [2.2]paracyclophanes in their enantiopure form.
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-41/
LOCATION:Université de Paris\, 45 Rue des Saints-Pères\, Paris\, 75006\, France
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210920T113000
DTEND;TZID=Europe/Paris:20210920T123000
DTSTAMP:20210920T122734Z
CREATED:20210920T121824Z
LAST-MODIFIED:20210920T122734Z
UID:22177-1632137400-1632141000@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:The biophysics of plant morphogenesis\n \nArezki Boudaoud from Ecole Polytechnique\n \nThe seminar will take place in  person in the Gulliver library and by zoom at the link below:\n\n\nWhat sets the size and form of organisms is still\, by large\, an open question. During this talk\, I will aim at a broad audience and illustrate how are addressing this question by using biophysical experiments and models applied to plant morphogenesis. On the one hand\, measurements of cell internal pressure support an analogy between plant tissues and liquid foams. On the other hand\, models suggest long-range correlations in growing tissues. This prompted us to analyse the spectra of fluctuations in growing tissues\, developing a novel approach that is applicable to geometrically disordered materials. Finally\, I will briefly present how we are using microfluidic approaches to investigate variability in morphogenesis between individual plants.\n\n\n******************************\n\nHeure : 20 sept. 2021 11:30 AM Paris\n\nParticiper à la réunion Zoom\nhttps://cnrs.zoom.us/j/94113852039?pwd=T1dsYzZYUXJqV1MrSm1MQW9ablM2QT09\n\nID de réunion : 941 1385 2039\nCode secret : xtVn1b
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-43/
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210920T140000
DTEND;TZID=Europe/Paris:20210920T150000
DTSTAMP:20210909T154056Z
CREATED:20210909T154056Z
LAST-MODIFIED:20210909T154056Z
UID:22134-1632146400-1632150000@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Dr. Simion Beldean from Babes Bolei University (Cluj Napoca\, Romania)\,  currently present in the CBI/LSABM\, will present his research work\, focused on the use of GCxGC for the analysis of complex environmental samples\, during a meeting that will take place on Monday 20th September\, at 14h.\n\n\n\nThis meeting will occur in the LSABM library (F2.09) and the presentation will also be broadcast using Zoom. The link to access the meeting is given below. \nhttps://espci.zoom.us/j/84750571488?pwd=aGZJRjVzMWpzVU00TjFYQ0hObnJMQT09 \nsecret code: behrohu
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-40/
LOCATION:Visioconférence
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210923T140000
DTEND;TZID=Europe/Paris:20210923T150000
DTSTAMP:20210920T123109Z
CREATED:20210920T123109Z
LAST-MODIFIED:20210920T123109Z
UID:22179-1632405600-1632409200@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:From Superfluids to Mott Insulators with Dipolar Excitons\nBy François Dubin\, INSP Paris\nSemiconductor excitons are composite bosons made by the Coulomb attraction between electrons and holes. Enforcing a spatial separation between these carriers provides a well oriented electric dipole to excitons\, which then become model dipolar quasi-particles to explore collective quantum phenomena in the solid-state. In this presentation I will illustrate this assertion by presenting recent experiments where dipolar excitons are confined in two-dimensional lattice potentials with tailored geometries. Varying the excitonic density\, we will then reveal that ultra-cold exciton gases evolve from the superfluid to the Mott insulating regime. \n\n\n\n\n\n\n\nZoom link: https://espci.zoom.us/j/83028453906?pwd=dWhTRTA0L2pWdTY5YTlzN3U3c0lYQT09\nID: 830 2845 3906\nPassword: S.N.Bose\nContact/to subscribe or unsubscribe: seminaires-lpem@espci.fr
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-44/
LOCATION:Visioconférence
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210927T113000
DTEND;TZID=Europe/Paris:20210927T123000
DTSTAMP:20210929T112641Z
CREATED:20210929T112039Z
LAST-MODIFIED:20210929T112641Z
UID:22282-1632742200-1632745800@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Controlling interactions in real space across the lengthscales: love\, hate and criticality\nPaddy Royall\n \nPolymers\, liquid crystals\, surfactants\, and colloidal dispersions form the four historic pillars of soft\nmatter. For physicists\, colloids were a relatively late entry into the field\, driven in no small way by\nthe seminal work of Peter Pusey and Bill van Megen in their experimental realisation of hard\nsphere phase behaviour\, arguably the simplest non—trivial material. Since then\, the ability to\nmanipulate the interactions between colloids\, i.e. making them attract or repel one another so that\nt hey can be treated as model atoms has led to many important discoveries.\nI will review some of the work done using colloids which has led to many developments such as a\ndeeper understanding of criticality\, crystallisation and a host of novel phenomena such as\nre—entrant melting\, before considering how knowledge gained from a soft matter approach to\nmanipulating interactions between constituent particles can be applied to other materials such as\nproteins. Recently\, a great deal of interest has been generated by active systems and towards\nthe end of the presentation I will explore analogies between active colloidal systems and a\nmodel biological system of zebrafish.\n\nThe meeting will have a hybrid format\, in person in the Gulliver library and by zoom at the link:\nhttps://cnrs.zoom.us/j/94113852039?pwd=T1dsYzZYUXJqV1MrSm1MQW9ablM2QT09\n\nID de réunion : 941 1385 2039\nCode secret : xtVn1b\n\n  \n 
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-45/
LOCATION:Visioconférence
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20210928T110000
DTEND;TZID=Europe/Paris:20210928T120000
DTSTAMP:20210929T121205Z
CREATED:20210929T121205Z
LAST-MODIFIED:20210929T121205Z
UID:22284-1632826800-1632830400@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Responsive microgels: from individual systems to their collective properties\nJérôme Crassous\, Institute of Physical Chemistry\, RWTH Aachen University\,52074 Aachen\, Germany\ncrassous@pc.rwth-aachen.de \nAbstract: \nAlthough poly(N-isopropylacrylamide) microgels have been widely used as model systems for soft colloids\, their properties are still far to be completely understood. This stems from their heterogeneous structure strongly differing from an idealized polymeric network. These features can be reproduced in computer simulations using the so-called in silico synthesis to capture the structural properties obtained with scattering techniques over a wide range of temperature and provide new insights on their interactions. \nAt higher volume fractions\, depending on their degree of crosslinking\, such soft microgels may further interpenetrate\, deform and facet with direct consequences on their rheological properties. In particular\, their ability to change size and thus volume fraction with temperature has made them highly attractive model systems for the investigation of liquid solid transitions such as the glass or jamming transition. This generally assumes that the interparticle interactions between microgels does not change with temperature\, and there seems to be common agreement that this is valid below at temperatures below the collapse or volume phase transition temperature. Here we now critically re-examine this assumption\, and present results from a systematic study of the effect of number density and temperature on the structural and dynamic properties of PNIPAM microgel suspensions. \nBased on the acquired knowledge\, we finally discuss how the interplay of molecular and colloidal scales controls drying of microgel dispersions. This is achieved by monitoring the drying at the end of a capillary exposed to a controlled humidity with constant particle feeding ensures by its connection to a reservoir. Hereby\, the water evaporation and diffusion set a flow driving the particles at the drying front where they build up crystals. Whether or not the particles are interpenetrable is characterized by the difference of scaling law in the time evolution of the drying front. We evidence an original drying behavior intermediate between colloidal and solution drying\, in which a diffusional scaling is observed together with a weak dependence on the air relative humidity. Mapping composition and structuration gradients using Raman spectroscopy and small-angle scattering techniques\, we show that this behavior stems from the ability of microgels to both interpenetrate and compact. As a result\, water activity and transport is drastically decreased in the vicinity of the air/liquid interface. This mechanism will be at play in a large diversity of complex colloidal systems and is pivotal for the mastering of drying processes.
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-46/
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://www.chimieparistech.psl.eu/wp-content/uploads/2020/06/chimie1.png
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