AI Article Synopsis
- The mechanics of soft elastic networks are crucial in both biology and technology, particularly concerning how liquid droplets interact with these surfaces.
- The study focuses on the complex relationship between contact angles of droplets on elastic surfaces and their surface energy, which varies with strain, and derives relevant equations from variational principles.
- Through experiments with silicone gel, the research confirms that stretching the substrate increases the mobility of the contact line, illustrating the influence of elasticity on droplet behavior.
Article Abstract
The interfacial mechanics of soft elastic networks plays 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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| http://dx.doi.org/10.1103/PhysRevLett.121.068003 | DOI Listing |
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