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Séminaires Invités

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Séminaires donnés par des invités extérieurs au LIPhy.

Ce sont des séminaires généraux qui s’adressent à tous les membres du LIPhy. Par conséquent, l’introduction, la plus large possible, y joue un rôle important.

Les séminaires durent environ 1heure dont 15mn accordées aux questions. Ils ont lieu les lundis à 14h, en salle de conférence du laboratoire au deuxième étage. La langue des séminaires est en général l’anglais.

L’accès au laboratoire peut-être obtenu en contactant le secrétariat.

Agenda

  • Lundi 23 janvier 14:00-15:30 - Patrick KEKICHEFF - Équipe Physique Mécanique et Tribologie des Polymères, Institut Charles Sadron, Strasbourg

    Sliding Polymer Ligands with Self-adjustable Tethers

    Résumé : Adhesion in the biological realm is mediated by specific lock-and-key interactions between ligand-receptor pairs. These complementary moieties are ubiquitously anchored to substrates by tethers that control the interaction range and the mobility of the ligands and receptors, thus tuning the kinetics and strength of the binding events. Here we add sliding anchoring to the toolbox of ligand-receptor design by developing a family of tethered ligands for which the spacer can slide at the anchoring point. Our results show that this additional sliding degree of freedom changes the nature of the adhesive contact by extending the spatial range over which binding may sustain a significant force. By introducing sliding tethered ligands with self-regulating length, this work paves the way for the development of versatile and reusable bio-adhesive substrates with potential applications for drug delivery and tissue engineering.



    contact : Elisabeth Charlaix

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Jeudi 26 janvier 11:00-13:00 - Peter FRATZL - Max Planck Institute of Colloids and Interfaces, Potsdam-Golm, Germany

    Exceptional seminar Namisceb

    Résumé : Exceptional seminar
    Namisceb
    Collagen-based extra-cellular matrices – the underestimated role of water
    We have the pleasure to announce you an exceptional seminar that will take place on January 26th at 11am, at the LIPhy, conference room.
    Collagen is the main organic component of many tissues in our body, including tendons, bone and dentin. The multi-scale structure of these tissues provides exceptional mechanical properties that combine stiffness with resilience or toughness. The talk will briefly review the current knowledge about the multi-scale structure of collagen in tendon and bone, in relation to their mechanical behavior. Recent data also show that collagen may contract by the action of osmotic stresses and provide pretension in extracellular tissues that compress mineral in dentin and bone. This indicates that collagen is not just a passive scaffold molecule in the extracellular matrix but that it likely plays an active mechanical role in establishing pre-tension in a variety of extracellular tissues.
    If you want to meet Prof. Fratzl, please contact : aurelie.dupont@univ-grenoble-alpes.fr


  • Lundi 30 janvier 14:00-15:30 - Olivier DAUCHOT - Gulliver, ESPCI, Paris

    Active Matter : Model and Experiments

    Résumé : The ubiquity of collective motions observed at all scales in more or less complex situations ranging from the cooperative action of molecular motors to the behavior of large animal or human groups, has recently driven a surge of theoretical and numerical activity.
    Within physics, most progress was achieved by studying microscopic point-particles models and their continuous descriptions. Among the landmark results are the possibility of true long-range orientational order in two dimensions, the generic presence of strong, long-range density correlations and the spontaneous formation of segregated dense and highly ordered nonlinear structures.
    In the present talk I will explore several experimental systems including walking grains, rolling colloids, and swimming droplets. In such model systems, one can in principle control the interactions amongst the agents and therefore provide firm experimental grounds in view of theoretical developments. In particular we shall discuss (i) how and why collective motion emerge in a system of polar disks, for which no alignment is a priori imposed at the microscopic level ; (ii) the case of the colloidal rollers where interactions are of hydrodynamics and electrostatic origins ; (iii) the intriguing swimming of pure water droplet in oil.



    contact : Chaouqi Misbah

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 6 février 14:00-15:30 - Aurélie HOURLIER-FARGETTE - Institut Jean Le Rond d’Alembert, UPMC, Paris - Département de Physique, Ecole Normale Supérieure, Paris

    Instabilities at Soft Interfaces : From Elastocapillary Snap-through to Wetting Dynamics on Elastomers

    Résumé : The role of surface tension in the mechanics of deformable solids is a question raising a growing interest in the soft matter community : in this context, I will present two examples of instabilities featuring liquids on soft materials.
    We will begin by revisiting the snap-through instability from an elastocapillary point of view. Snap-through, present in systems ranging from carnivorous plants to MEMS, is a well-known phenomenon in solid mechanics. Here we show that capillary forces are strong enough to trigger a snap-through instability at small scales, and even counterbalance gravity for a droplet deposited below a downward buckled elastic strip. We investigate the statics and dynamics of this phenomenon, and compare droplet-induced snap-through to dry point force indentation on a buckled thin strip.
    In a second part, we will focus on the dynamics of droplets sliding on elastomers. The motion of droplets on stiff surfaces has been investigated for a long time, while recent studies have shown the interesting physics underlying the sliding of droplets on soft surfaces. We focus on the dynamics of water-glycerol mixture droplets sliding down vertical plates of commercial silicone elastomers, highlighting an unexpected behavior : the droplet dynamics on such a surface includes two regimes with different constant speeds. Our experiments reveal an unexpected link between microscopic phenomena at the scale of the polymer matrix and the macroscopic dynamics of a droplet.



    contact : Philippe Marmottant

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 6 mars 14:00-15:30 - Stéphanie Pitre-Champagnat - IR4, Orsay

    LIPHY Seminar

    Résumé :



    contact : Gwennou Coupier

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 13 mars 14:00-15:30 - Philippe Coussot - laboratoire Navier, UMR 8205 CNRS, ENPC-ParisTech, IFSTTAR, Université Paris-Est à Champs- sur-Marne

    LIPHY Seminar

    Résumé :



    contact : Elise Lorenceau

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 20 mars 14:00-15:30 - Olivier Baledent - Reims

    LIPHY Seminar

    Résumé :



    contact : Mourad Ismaïl

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 27 mars 14:00-15:30 - Céline Labouesse - Stem Cell Institue, Cambridge

    LIPHY Seminar

    Résumé :



    contact : Pierre Recho

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 3 avril 14:00-15:30 - Marcel Lauterbach - MPI for Brain Research, Frankfurt, Germany

    LIPHY Seminar

    Résumé :



    contact : Aurélie Dupont

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


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  • Jeudi 26 janvier 11:00-13:00 - Peter FRATZL - Max Planck Institute of Colloids and Interfaces, Potsdam-Golm, Germany

    Exceptional seminar Namisceb

    Résumé : Exceptional seminar
    Namisceb
    Collagen-based extra-cellular matrices – the underestimated role of water
    We have the pleasure to announce you an exceptional seminar that will take place on January 26th at 11am, at the LIPhy, conference room.
    Collagen is the main organic component of many tissues in our body, including tendons, bone and dentin. The multi-scale structure of these tissues provides exceptional mechanical properties that combine stiffness with resilience or toughness. The talk will briefly review the current knowledge about the multi-scale structure of collagen in tendon and bone, in relation to their mechanical behavior. Recent data also show that collagen may contract by the action of osmotic stresses and provide pretension in extracellular tissues that compress mineral in dentin and bone. This indicates that collagen is not just a passive scaffold molecule in the extracellular matrix but that it likely plays an active mechanical role in establishing pre-tension in a variety of extracellular tissues.
    If you want to meet Prof. Fratzl, please contact : aurelie.dupont@univ-grenoble-alpes.fr


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