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Article Dans Une Revue Physical Review E Année : 2022

Electroviscous drag on squeezing motion in sphere-plane geometry

Résumé

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.
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Dates et versions

hal-03697317 , version 1 (16-06-2022)

Identifiants

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Marcela Rodríguez Matus, Zaicheng Zhang, Zouhir Benrahla, Arghya Majee, Abdelhamid Maali, et al.. Electroviscous drag on squeezing motion in sphere-plane geometry. Physical Review E , 2022, 105 (6), pp.064606. ⟨10.1103/PhysRevE.105.064606⟩. ⟨hal-03697317⟩

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