RODRÍGUEZ MATUS, Marcela; ZHANG, Zaicheng; BENRAHLA, Zouhir; MAJEE, Arghya; MAALI, Abdelhamid; WÜRGER, Alois

doi:10.1103/PhysRevE.105.064606

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RODRÍGUEZ MATUS, Marcela
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

ZHANG, Zaicheng
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

BENRAHLA, Zouhir
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Physical Review E. 2022, vol. 105, n° 6, p. 064606

American Physical Society (APS)

Résumé en anglais

Theoretically and experimentally, we study electroviscous phenomena resulting from charge-flow coupling in a nanoscale capillary. Our theoretical approach relies on Poisson-Boltzmann mean-field theory and on coupled linear relations for charge and hydrodynamic flows, including electro-osmosis and charge advection. With respect to the unperturbed Poiseuille flow, we define an electroviscous coupling parameter ξ , which turns out to be maximum where the film height h 0 is comparable to the Debye screening length λ. We also present dynamic atomic force microscopy data for the viscoelastic response of a confined water film in sphere-plane geometry; our theory provides a quantitative description for the electroviscous drag coefficient and the electrostatic repulsion as a function of the film height, with the surface charge density as the only free parameter. Charge regulation sets in at even smaller distances.< Réduire

DOI

http://dx.doi.org/10.1103/PhysRevE.105.064606

Project ANR

Electrodynamical diffuse layers - ANR-19-CE30-0012

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