Direct Measurement of the Elastohydrodynamic Lift Force at the Nanoscale
arXiv:1907.05849 · doi:10.1103/PhysRevLett.124.054502
Abstract
We present the first direct measurement of the elastohydrodynamic lift force acting on a sphere moving within a viscous liquid, near and along a soft substrate under nanometric confinement. Using atomic force microscopy, the lift force is probed as a function of the gap size, for various driving velocities, viscosities, and stiffnesses. The force increases as the gap is reduced and shows a saturation at small gap. The results are in excellent agreement with scaling arguments and a quantitative model developed from the soft lubrication theory, in linear elasticity, and for small compliances. For larger compliances, or equivalently for smaller confinement length scales, an empirical scaling law for the observed saturation of the lift force is given and discussed.
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- Influence of non-hydrodynamic forces on the elastic response of an ultra-thin soft coating under fluid-mediated dynamic loading
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- Lift induced by slip inhomogeneities in lubricated contacts
- Elasto-inertial rectification of oscillatory flow in an elastic tube
- Asymmetric Stokes flow induced by a transverse point-force acting near a finite-sized elastic membrane
- Interactions enhance dispersion in fluctuating channels via emergent flows
- Capillary lubrication of a spherical particle near a fluid interface
- Elastohydrodynamics of a soft coating under fluid-mediated loading by a spherical probe
- Enhancement and Suppression of Active Particle Movement Due to Membrane Deformations