ALEXANDRE, Arthur; LAVAUD, Maxime; FARES, Nicolas; MILLAN, Elodie; LOUYER, Yann; SALEZ, Thomas; AMAROUCHENE, Yacine; GUÉRIN, Thomas; DEAN, David S.

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ALEXANDRE, Arthur
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LAVAUD, Maxime
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

FARES, Nicolas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Physical Review Letters. 2023, vol. 130, p. 077101

American Physical Society

Résumé en anglais

We study the diffusion of particles confined close to a single wall and in double-wall planar channel geometries where the local diffusivities depend on the distance to the boundaries. Displacement parallel to the walls is Brownian as characterized by its variance, but it is non-Gaussian having a non-zero fourth cumulant. Establishing a link with Taylor dispersion, we calculate the fourth cumulant and the tails of the displacement distribution for general diffusivity tensors along with potentials generated by either the walls or externally, for instance gravity. Experimental and numerical studies of the motion of a colloid in the direction parallel to the wall give measured fourth cumulants which are correctly predicted by our theory. Interestingly, contrary to models of Brownian-yet-non-Gaussian diffusion, the tails of the displacement distribution are shown to be Gaussian rather than exponential. All together, our results provide additional tests and constraints for the inference of force maps and local transport properties near surfaces.< Réduire

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

Premières rencontres en environnement complexe - ANR-21-CE30-0020
Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Frottements dans les systèmes complexes - ANR-21-CE06-0039

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798