LAVAUD, Maxime; SALEZ, Thomas; LOUYER, Yann; AMAROUCHENE, Yacine

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

SALEZ, Thomas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LOUYER, Yann
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Article de revue

Ce document a été publié dans

Physical Review Research. 2021, vol. 3, p. L032011

American Physical Society

Résumé en anglais

Brownian motion in confinement and at interfaces is a canonical situation, encountered from fundamental biophysics to nanoscale engineering. Using the Lorenz-Mie framework, we optically record the thermally-induced tridimensional trajectories of individual microparticles, within salty aqueous solutions, in the vicinity of a rigid wall, and in the presence of surface charges. We construct the time-dependent position and displacement probability density functions, and study the non-Gaussian character of the latter which is a direct signature of the hindered mobility near the wall. Based on these distributions, we implement a novel, robust and self-calibrated multifitting method, allowing for the thermal-noise-limited inference of diffusion coefficients spatially-resolved at the nanoscale, equilibrium potentials, and forces at the femtoNewton resolution.< Réduire

Project ANR

Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010

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Unités de recherche

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