Viscoelastic and poroelastic relaxations of soft solid surfaces
arXiv:2006.09767 · doi:10.1103/PhysRevLett.125.238002
Abstract
Understanding surface mechanics of soft solids, such as soft polymeric gels, is crucial in many engineering processes, such as dynamic wetting and adhesive failure. In these situations, a combination of capillary and elastic forces drives the motion, which is balanced by dissipative mechanisms to determine the rate. While shear rheology (i.e. viscoelasticity) has long been assumed to dominate the dissipation, recent works have suggested that compressibility effects (i.e. poroelasticity) could play roles in swollen networks. We use fast interferometric imaging to quantify the relaxation of surface deformations due to a displaced contact line. By systematically measuring the profiles at different time and length scales, we experimentally observe a crossover from viscoelastic to poroelastic surface relaxations.
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- Phase Separation in Wetting Ridges of Sliding Drops on Soft and Swollen Surfaces
- The role of crosslinking density in surface stress and surface energy of soft solids
- Elasticity-Controlled Jamming Criticality in Soft Composite Solids
- Dynamics of Droplets Moving on Lubricated Polymer Brushes
- Emergence and Growth Dynamics of Wetting-induced Phase Separation on Soft Solids
- Adhesion of fluid infused silicone elastomer to glass
- Unravelling the multiscale surface mechanics of soft solids