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24 mai 2018: 1 événement

  • Séminaires Invités

    Jeudi 24 mai 2018 11:00-12:30 - Simon Gravelle - Universidad Adolfo Ibáñez, Viña del Mar, Chile

    Nanofluidics : a theoretical and numerical investigation of fluid transport in nanochannels

    Résumé : Inspired by aquaporin, a natural hourglass-shaped water channel, we found that this particular geometry allows a significant improvement of the hydrodynamic permeability of a channel, thanks to a geometrical optimization of the entrance dissipation. Our results suggest that a specific value of the hourglass angle optimizes the water flow and, strikingly, this angle appears to be close to the angles measured on aquaporins.
    We studied capillary filing inside subnanometric carbon channels. We showed that the disjoining pressure induced by the fluid structuring inside the nanochannel plays a major role in the capillary filing dynamics. A remarkable consequence is that, for a given chemistry, the wettability of a nanochannel may brutally vary with its dimension. We discuss some potential applications in water-ethanol separation.
    Bonus : surviving without roots in the Atacama Desert
    We analyze the structure and function of the Tillandsia trichome to explain the trichome’s uncanny ability to absorb water from fog while also minimizing evaporative losses within the hyperarid Atacama Desert.

    contact : Benoit Coasne

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

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