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11 janvier 2018: 1 événement

  • Séminaires Invités

    Jeudi 11 janvier 11:00-12:30 - Romain LHERMEROUT - Physical and Theoretical Chemistry Laboratory, University of Oxford, UK

    Interactions Across Nanoconfined Ionic Liquids

    Résumé : Ionic liquids are pure salts that are liquid under room temperature-pressure conditions. During the last decade they have been the focus of intense study because of their exceptional properties (nonvolatility, high conductivity, chemical stability etc.), which make them extremely promising for a range of applications (energy storage, lubrication, catalysis etc.).
    In particular, recent reports have revealed the existence of an anomalously long-ranged electrostatic interaction. However, these studies did not consider the effect of viscosity, which could be substantial given ionic liquids are typically 100 times more viscous than water. To disentangle the equilibrium and dynamical contributions, we performed systematic drainage measurements with a Surface Force Balance, exploring 3 orders of magnitude in approach velocity. We characterized the slip boundary condition by the presence of a structured, non-flowing layer at the wall, and showed that a long-range equilibrium force has to be invoked to describe the data quantitatively.
    Ionic liquids are also promising lubricants because of their ability to form structured boundary layers which are strongly bound on charged surfaces. We propose a new method to measure the frictional behavior as a function of the number of molecular layers separating the solid surfaces.



    contact : Benjamin Cross

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

    En savoir plus : Séminaires Invités