Nanoparticle Taylor dispersion near charged surfaces with an open boundary
BERTIN, Vincent
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Gulliver (UMR 7083)
University of Twente
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Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Gulliver (UMR 7083)
University of Twente
BERTIN, Vincent
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Gulliver (UMR 7083)
University of Twente
< Reduce
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Gulliver (UMR 7083)
University of Twente
Language
en
Article de revue
This item was published in
Physical Review Letters. 2023, vol. 130, n° 3, p. 038201
American Physical Society
English Abstract
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. ...Read more >
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.Read less <
English Keywords
Taylor dispersion
Shear flows
Nanoparticle dispersion
Microfluidics
European Project
Brownian Motion near Soft Interfaces
ANR Project
Confinement des Polymères en Solution : Recherches Optiques Avancées Sous Confinement Extrême - ANR-19-CE06-0021
Mouvement brownien au voisinage d'interfaces molles
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Frottements dans les systèmes complexes - ANR-21-CE06-0039
Mouvement brownien au voisinage d'interfaces molles
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Frottements dans les systèmes complexes - ANR-21-CE06-0039
Origin
Hal imported