ZHANG, Zaicheng; ARSHAD, Muhammad; BERTIN, Vincent; ALMOHAMAD, Samir; RAPHAËL, Elie; SALEZ, Thomas; MAALI, Abdelhamid

doi:10.1103/PhysRevApplied.17.064045

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

ARSHAD, Muhammad
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

BERTIN, Vincent
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Physical Review Applied. 2022, vol. 17, p. 064045

American Physical Society

Résumé en anglais

We report contactless measurements of the viscoelastic rheological properties of soft gels. The experiments are performed using a colloidal-probe Atomic Force Microscope (AFM) in a liquid environment and in dynamic mode. The mechanical response is measured as a function of the liquid gap thickness for different oscillation frequencies. Our measurements reveal an elastohydrodynamic (EHD) coupling between the flow induced by the probe oscillation and the viscoelastic deformation of the gels. The data are quantitatively described by a viscoelastic lubrication model. The frequency-dependent storage and loss moduli of the polydimethylsiloxane (PDMS) gels are extracted from fits of the data to the model and are in good agreement with the Chasset–Thirion law. Our results demonstrate that contactless colloidal-probe methods are powerful tools that can be used for probing soft interfaces finely over a wide range of frequencies.< Réduire

DOI

http://dx.doi.org/10.1103/PhysRevApplied.17.064045

Project ANR

Electrodynamical diffuse layers - ANR-19-CE30-0012
Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029

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