KOPECZ-MULLER, Caroline; BERTIN, Vincent; RAPHAËL, Elie; MCGRAW, Joshua; SALEZ, Thomas

doi:10.1098/rspa.2022.0832

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KOPECZ-MULLER, Caroline
Gulliver (UMR 7083)
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

BERTIN, Vincent
University of Twente

RAPHAËL, Elie
Gulliver (UMR 7083)

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Proceedings of the Royal Society of London A Mathematical and Physical Sciences. 2023, vol. 479, n° 2271, p. 20220832

Resumen en inglés

When a rigid object approaches a soft material in a viscous fluid, hydrodynamic stresses arise in the lubricated contact region and deform the soft material. The elastic deformation modifies in turn the flow, hence generating a soft-lubrication coupling. Moreover, soft elastomers and gels are often porous. These materials may be filled with solvent or uncrosslinked polymer chains, and might be permeable to the surrounding fluid, which complexifies further the description. Here, we derive the point-force response of a semi-infinite and permeable poroelastic substrate. Then, we use this fundamental solution in order to address the specific poroelastic lubrication coupling associated with contactless colloidal-probe methods. In particular, we derive the conservative and dissipative components of the force associated with the oscillating vertical motion of a sphere close to the poroelastic substrate. Our results may be relevant for dynamic surface force apparatus and contactless colloidal-probe atomic force microscopy experiments on soft, living and/or fragile materials, such as swollen hydrogels and biological membranes.< Leer menos

DOI

http://dx.doi.org/10.1098/rspa.2022.0832

Proyecto europeo

Brownian Motion near Soft Interfaces

Proyecto ANR

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

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