Supervisory authorities


   

   

our social networks


               

Search




Home > Research > Talks & Conferences > Talks Given at LIPhy

Invited Talks

published on , updated on

These talks are given by invited speakers at LIPhy. The intended audience is the whole LIPhy. A large general introduction intended for non-specialist is usually provided.

Typical talk duration is around one hour and includes about 15 mn of questions. The talks are scheduled usually every Monday at 2PM. The place is at the conference room, second floor.

Access to the lab can be obtained by calling Nadine D’Andréa or Chantal Reignier through the intercom at the main entrance.

Agenda

  • Monday 13 December 2021 14:00-15:30 - Adrien Bussonnière - MSC. Univ. Paris / CNRS

    Local origin of the viscoelasticity of liquid foam

    Résumé : Liquid foam mainly consists of air bubbles separated by soap-stabilized thin liquid films. This light and fragile material is surprisingly extremely dissipative, its effective viscosity can be as high as thousands of times the water viscosity. Localization of the velocity gradient in the thin liquid films, resulting in important viscous dissipation, has been invoked to rationalized this dissipation enhancement. Nonetheless, the local stresses driving and controlling the liquid phase flow remains an open question. In this talk, we reveal the local origin of the strain confinement in the films and provide a dissipative mechanism, at the scale of few bubbles.
    When deformed, we show that the largest part of the foam films surprisingly behaves as a pure reversible elastic. Their stored elastic energy is then released by exchanging interface with the neighbor films. However, the film junctions, where 3 films meet, cannot accommodate a uniform velocity on each of its interfaces. This geometrical frustration gives rise to a shear flow in a small domain of the film, close to the junction, and is at the origin of the enhanced dissipation. The size of these sheared regions, and the induced dissipation, are modelled, and are shown to be controlled by the soap molecule diffusivity and solubility. Our results provide the missing link between the solution physico-chemical properties and the apparent viscosity. We foresee that established local laws will allow to unravel foam rheology.
    ===================
    Contact: Benjamin Dollet


  • Thursday 13 January 14:00-15:30 - Michele Migliore - Institute of Biophysics, National Research Council, Palermo

    Cognitive functions (and dysfunctions) emerging from large-scale data-driven models of brain regions

    Résumé : Understanding the neural basis of brain functions and dysfunctions has a huge impact on a number of scientific, technical, and social fields. Experimental findings have given and continue to give important clues at different levels, from subcellular biochemical pathways to behaviors. However, most of the multi-level mechanisms underlying the cognitive architecture of the involved brain regions are still largely unknown or poorly understood. This mainly depends on the practical impossibility to obtain detailed simultaneous in vivo recordings from an appropriate set of cells, making it nearly impossible to decipher and understand the emergent properties and behavior of large neuronal networks. We are addressing this problem using large-scale computational models of biologically inspired cognitive architectures. I will present and discuss the main results and techniques we use to design and exploit full-scale models of neurons and networks implemented following their natural 3D structure, with the main aim to uncover the mechanisms underlying higher brain functions and helping the development of innovative therapies to treat brain diseases.
    ============
    Contact: Laila Blömer


  • Monday 17 January 14:00-15:30 - Marie-Jean Thoraval - Xi'an Jiaotong University

    Impact dynamics of compound drops

    Résumé : The impact of a liquid drop has many applications, from combustion to cooling technologies or 3D printing. Additional materials can be loaded into the drop to enhance these applications, such as for the printing of dispersions, biomaterials or polymer foams. The impact dynamics of the resulting complex drops are still not well understood. We focus here on the simplest geometries of compound drops, where either a particle, an immiscible liquid drop or a bubble is added inside the drop. We systematically investigate some of the new dynamics emerging from the impact of these compound drops, including vertical jetting and rebound.
    ==========
    Contact: Philippe Marmottant


  • Monday 31 January 14:00-15:30 - Isabelle Beurroies - MADIREL, Aix-Marseille Université

    Nanoporous materials: from their characterization to adsorption or energy storage applications

    Résumé : The use of nanoporous materials is wide and concerns the fields of catalysis, health, energy, environment and sustainable development.
    In the case of separation or storage of molecules, the knowledge of the textural characteristics is fundamental. For that, standard technics can be used such as N2 adsorption at 77K or mercury porosimetry to determine the surface area, the pore volume or the pore size distribution.
    Adsorption is an important process investigated for gas separation/storage and also for liquid purification. To quantify the phenomenon the adsorption isotherms need to be established. According to the adsorbate phase, different technics are available either manometry/gravimetry for the gas or liquid depletion method for liquid phase.
    A better understanding of the mechanism of adsorption is possible by combining these technics with microcalorimetry allowing to measure the energy involved for the interaction between the nanoporous adsorbent and the probe.
    Moreover the nanoporous materials may be used as mechanical energy storage systems. When they are submitted to mechanical pressure :
    i) either the non wetting transmitting pressure fluid may enter into the pore at a defined pressure leading to the intrusion involving a conversion of mechanical energy into interfacial energy
    ii) or the flexible nanoporous material (such as MOFs) undergoes a structural change
    According to the reversibility of the phenomenon the material show different mechanical behavior from spring to dumpers


  • Monday 7 February 14:00-15:30 - Clément Lauzin - Université Catholique de Louvain-la-Neuve

    Séminaire LIPhy

    Résumé : =======
    Contact: Irène Ventrillard


  • Tuesday 8 March 14:00-15:30 - Rik Vos - Erasmus MC Rotterdam

    Séminaire LIPhy

    Résumé : ========
    Contact: Gwennou Coupier


  • Thursday 24 March 14:00-15:30 - Gerald Kneller - Centre de Biophysique Moléculaire, CNRS

    Séminaire LIPhy

  • Monday 28 March 14:00-15:30 - Ramiro Gaudoy-Diana et Benjamin Thiria - PMMH, ESPCI

    Séminaire LIPhy

    Résumé : Contact: Aurélie Dupont / Philippe Peyla


  • Monday 11 April 14:00-15:30 - Stefano Berti - Université de Lille

    Séminaire LIPhy

    Résumé : ========
    Contact: Salima Rafaï


Ajouter un événement iCal