VILQUIN, Alexandre; BERTIN, Vincent; RAPHAËL, Elie; DEAN, David; SALEZ, Thomas; MCGRAW, Joshua

doi:10.1103/PhysRevLett.130.038201

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VILQUIN, Alexandre
Gulliver (UMR 7083)
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

BERTIN, Vincent
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Gulliver (UMR 7083)
University of Twente

RAPHAËL, Elie
Gulliver (UMR 7083)

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Article de revue

Ce document a été publié dans

Physical Review Letters. 2023, vol. 130, n° 3, p. 038201

American Physical Society

Résumé en anglais

The dispersive spreading of microscopic particles in shear flows is influenced both by advection and thermal motion. At the nanoscale, interactions between such particles and their confining boundaries become unavoidable. We address the roles of electrostatic repulsion and absorption on the spatial distribution and dispersion of charged nanoparticles in near-surface shear flows, observed under evanescent illumination. The electrostatic repulsion between particles and the lower charged surface is tuned by varying electrolyte concentrations. Particles leaving the field of vision can be neglected from further analysis, such that the experimental ensemble is equivalent to that of Taylor dispersion with absorption. These two ingredients modify the particle distribution, deviating strongly from the Gibbs-Boltzmann one at the nanoscale studied here. The overall effect is to restrain the accessible space available to particles, leading to a striking, ten-fold reduction in the spreading dynamics as compared to the non-interacting case.< Réduire

Mots clés en anglais

Taylor dispersion

Shear flows

Nanoparticle dispersion

Microfluidics

DOI

http://dx.doi.org/10.1103/PhysRevLett.130.038201

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

Confinement des Polymères en Solution : Recherches Optiques Avancées Sous Confinement Extrême - ANR-19-CE06-0021
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

Origine

Importé de hal

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