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Brownian motion in confinement

ORAL

Abstract

Brownian motion in confinement is a paradigm for numerous biological situations. Here, we study the diffusion of micrometer-sized beads in water confined between two walls that are separated by a micrometric distance. Using holographic microscopy, we track the particles in three dimensions with a precision approaching the nanometric range. From statistical analysis performed on the individual trajectories, we extract the local diffusion coefficient as a function of the position of the bead in the microcavity. The experimental results are in good agreement with the numerical and analytical predictions — which paves the way towards the study of other situations of confinement, such as soft boundaries.

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Presenters

  • Maxime Lavaud

    Laboratoire Ondes et Matière d'Aquitaine, CNRS

Authors

  • Maxime Lavaud

    Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • Pierre Soulard

    Gulliver, ESPCI Paris, PSL Research University, ESPCI, Gulliver

  • Vincent Bertin

    Gulliver, ESPCI Paris, ESPCI Paris, Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • David Dean

    Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • Raphael Sarfati

    University of Colorado, Boulder, Department of Chemical and Biological Engineening, Boulder

  • Elie Raphael

    Gulliver, ESPCI Paris, ESPCI Paris, PSL Research University, ESPCI, Gulliver

  • Yann Louyer

    Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • Thomas Salez

    LOMA, Université de Bordeaux, University of Bordeaux, Université de Bordeaux, Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • Yacine Amarouchene

    Laboratoire Ondes et Matière d'Aquitaine, CNRS