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

    • ESPCI Paris
    • PSL Research University : UMR7083, ESPCI, Gulliver

  • Vincent Bertin

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

  • David Dean

    • Laboratoire Ondes et Matière d'Aquitaine, CNRS
    • France, Universite Bordeaux

  • Raphael Sarfati

    • University of Colorado Boulder
    • Department of Chemical and Biological Engineering, Boulder

  • Elie Raphael

    • ESPCI Paris
    • PSL Research University : UMR7083, ESPCI, Gulliver

  • Yann Louyer

    • Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • Thomas Salez

    • Université de Bordeaux
    • Laboratoire Ondes et Matière d'Aquitaine, CNRS

  • yacine Amarouchene

    • Laboratoire Ondes et Matière d'Aquitaine, CNRS