Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.198001
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Funding
- Universite Grenoble Alpes, the Spanish Ministry for Economy and Competiveness [MAT2014-54867-R]
- European Research Council [306435]
- French Agence Nationale de la Recherche [ANR-13-JS08-0002-01]
- Centre National d'Etudes Spatiales (CNES)
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We study experimentally the motion of nondeformable microbeads in a linear shear flow close to a wall bearing a thin and soft polymer layer. Combining microfluidics and 3D optical tracking, we demonstrate that the steady-state bead-to-surface distance increases with the flow strength. Moreover, such lift is shown to result from flow-induced deformations of the layer, in quantitative agreement with theoretical predictions from elastohydrodynamics. This study thus provides the first experimental evidence of soft lubrication at play at small scale, in a system relevant, for example, to the physics of blood microcirculation.
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