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

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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)

Langue

Document de travail - Pré-publication

Résumé en anglais

The dispersion of microscopic particles in shear flows is influenced both by advection and thermal motion. At the nanoscale, the interactions between such particles and their confining boundaries, along with their size, cannot be neglected. Here, using evanescent-wave microscopy with sub-micrometric observation zones, we study the transport of charged nanoparticles in linear shear flows, near a charged, planar wall on one side, and an open, particle-consuming boundary on the other side where the particle leaves the observation zone. By varying the concentration of electrolytes, we show how electrostatic interactions between particles and surface affect dispersion. In addition, an absorption-like condition at the open boundary induces an exponential decay of the particle number, which alters the transport efficiency. The combination of these two effects reduces the overall dispersion by an order of magnitude, as captured by our theoretical model. Our findings might have implications in biological contexts as well as in technological devices based on the transport of confined diffusive objects at small scales.< Réduire

Mots clés en anglais

Taylor dispersion

Shear flows

Nanoparticle dispersion

Microfluidics

URI

https://oskar-bordeaux.fr/handle/20.500.12278/164967

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 - ANR-21-CE06-0039

Origine

Importé de hal

Unités de recherche

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