The paradox of contact angle selection on stretched soft solids
arXiv:1803.04428 · doi:10.1103/PhysRevLett.121.068003
Abstract
The interfacial mechanics of soft elastic networks play a central role in biological and technological contexts. Yet, effects of solid capillarity have remained controversial, primarily due to the strain-dependent surface energy. Here we derive the equations that govern the selection of contact angles of liquid drops on elastic surfaces from variational principles. It is found that the substrate's elasticity imposes a nontrivial condition that relates pinning, hysteresis and contact line mobility to the so-called Shuttleworth effect. We experimentally validate our theory for droplets on a silicone gel, revealing an enhanced contact line mobility when stretching the substrate.
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Cited by in corpus (11)
- Dynamic solid surface tension causes droplet pinning and depinning
- Wetting on Silicone Surfaces
- Droplets sit and slide anisotropically on soft, stretched substrates
- The role of crosslinking density in surface stress and surface energy of soft solids
- Measuring surface tensions of soft solids with huge contact-angle hysteresis
- Soft wetting with (a)symmetric Shuttleworth effect
- On the singular nature of the elastocapillary ridge
- Soft electrowetting
- Emergence and Growth Dynamics of Wetting-induced Phase Separation on Soft Solids
- Gradient Induced Droplet Motion Over Soft Solids
- Universal description of wetting on multiscale surfaces using integral geometry