Contactless Rheology of Soft Gels over a Broad Frequency Range
ALMOHAMAD, Samir
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
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Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Language
en
Article de revue
This item was published in
Physical Review Applied. 2022, vol. 17, p. 064045
American Physical Society
English Abstract
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. ...Read more >
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.Read less <
ANR Project
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
Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Origin
Hal imported