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16 avril 2018: 1 événement

  • Séminaires Invités

    Lundi 16 avril 14:00-15:30 - Laurent JOLY - Institut Lumière Matière, Université Lyon 1

    Molecular Views on Osmotic Flows

    Résumé : Osmotic flows are generated at interfaces by various thermodynamic gradients (e.g. electric potential gradient : electro-osmosis, solute concentration gradient : diffusio-osmosis, temperature gradient : thermo-osmosis). They represent powerful tools to manipulate liquids in micro and nanofluidic systems, and play a key role in living systems, in sustainable energies, or in water treatment and desalination processes. Osmotic flows arise from the coupling between hydrodynamics and liquid-wall interactions in the nanometric vicinity of the interface, and yet standard descriptions are usually based on continuum models and liquid-wall interactions only. During this talk I will illustrate with recent work how molecular dynamics simulations can be used to investigate the mechanisms underlying osmotic flows.
    In particular I will discuss the case of thermo-osmosis. We have shown the critical role of interfacial hydrodynamics, which can reverse the direction of the flow, and strongly amplify it. Notably, we have predicted giant thermo-osmotic flows at the water-graphene interface and through carbon-based membranes. These theoretical results open many perspectives for the efficient generation of flows using waste heat, which could be applied for instance to sea water desalination.



    contact : Benjamin Cross

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

    En savoir plus : Séminaires Invités