Elastic deformation during dynamic force measurements in viscous fluids
arXiv:1809.10850 · doi:10.1016/j.cocis.2016.09.009
Abstract
Understanding and harnessing the coupling between lubrication pressure and elasticity provides materials design strategies for applications such as adhesives, coatings, microsensors, and biomaterials. Elastic deformation of compliant solids caused by viscous forces can also occur during dynamic force measurements in instruments such as the surface forces apparatus (SFA) or the atomic force microscope (AFM). We briefly review hydrodynamic interactions in the presence of soft, deformable interfaces in the lubrication limit. More specifically, we consider the scenario of two surfaces approaching each other in a viscous fluid where one or both surfaces is deformable, which is also relevant to many force measurement systems. In this article the basic theoretical background of the elastohydrodynamic problem is detailed, followed by a discussion of experimental validation and considerations, especially for the role of elastic deformation on surface forces measurements. Finally, current challenges to our understanding of soft hydrodynamic interactions, such as the consideration of substrate layering, poroelasticity, viscoelasticity, surface heterogeneity, as well as their implications are discussed.
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- A reciprocal theorem for the prediction of the normal force induced on a particle translating parallel to an elastic membrane
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- Axisymmetric flow due to a Stokeslet near a finite-sized elastic membrane
- Influence of non-hydrodynamic forces on the elastic response of an ultra-thin soft coating under fluid-mediated dynamic loading
- Morphology of soft and slippery contact via fluid drainage
- Lift induced by slip inhomogeneities in lubricated contacts
- Droplet settling on solids coated with a soft layer
- Hydrodynamic stress correlations in fluid films driven by stochastic surface forcing