Solid surface tension measured by a liquid drop under a solid film
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TLDR
It is shown that a drop of liquid a few hundred microns in diameter placed under a solid, elastic, thin film causes it to bulge by tens of microns, demonstrating that compliant thin-film structures can be used to measure solid surface tensions.Abstract:
We show that a drop of liquid a few hundred microns in diameter placed under a solid, elastic, thin film (∼10 μm thick) causes it to bulge by tens of microns. The deformed shape is governed by equilibrium of tensions exerted by the various interfaces and the solid film, a form of Neumann’s triangle. Unlike Young’s equation, which specifies the contact angles at the junction of two fluids and a (rigid) solid, and is fundamentally underdetermined, both tensions in the solid film can be determined here if the liquid–vapor surface tension is known independently. Tensions in the solid film have a contribution from elastic stretch and a constant residual component. The residual component, extracted by extrapolation to films of vanishing thickness and supported by analysis of the elastic deformation, is interpreted as the solid–fluid surface tension, demonstrating that compliant thin-film structures can be used to measure solid surface tensions.read more
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Journal ArticleDOI
Surface tension and contact with soft elastic solids
Robert W. Style,Callen Hyland,Rostislav Boltyanskiy,John S. Wettlaufer,John S. Wettlaufer,Eric R. Dufresne +5 more
TL;DR: It is shown that, whereas the Johnson-Kendall-Roberts theory holds for particles larger than a critical, elastocapillary lengthscale, it fails for smaller particles, and adhesion of small particles mimics the adsorption of particles at a fluid interface, with a size-independent contact angle between the undeformed surface and the particle given by a generalized version of the Young's law.
Journal ArticleDOI
Elastocapillarity: Surface Tension and the Mechanics of Soft Solids
TL;DR: In this paper, the authors outline the theory of surface stresses from both mechanical and thermodynamic perspectives, emphasizing the relationship between surface stress and surface energy, and highlight how surface stresses cause dramatic departures from classic theories for wetting (Young-Dupre), adhesion (Johnson-Kendall-Roberts), and composites (Eshelby).
Journal ArticleDOI
Stiffening solids with liquid inclusions
Robert W. Style,Robert W. Style,Rostislav Boltyanskiy,Benjamin Allen,Katharine Jensen,Henry P. Foote,John S. Wettlaufer,John S. Wettlaufer,John S. Wettlaufer,Eric R. Dufresne +9 more
TL;DR: In this paper, the authors show that when the droplets are small enough, material can become stiffer, highlighting a role for surface tension in embedded with fluid inclusions, and demonstrate that the surface tension increases with the size of the inclusions.
Journal ArticleDOI
Elastocapillarity: when Surface Tension Deforms Elastic Solids
TL;DR: In this paper, a review of different scaling parameters and characteristic lengths involved in elastocapillarity is presented, focusing on three main configurations, each characterized by a specific dimension: three-dimensional (3D), deformations induced in bulk solids; 1D, bending and bundling of rod-like structures;...
References
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An Essay on the Cohesion of Fluids
TL;DR: In this article, it has been shown that for each combination of a solid and a fluid, there is an appropriate angle of contact between the surfaces of the fluid, exposed to the air, and to the solid.
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Capillarity and Wetting Phenomena
TL;DR: The first € price and the £ and $ price are net prices, subject to local VAT as discussed by the authors, and prices and other details are subject to change without notice. All errors and omissions excepted.
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TL;DR: This paper describes the compatibility of poly(dimethylsiloxane) (PDMS) with organic solvents; this compatibility is important in considering the potential of PDMS-based microfluidic devices in a number of applications, including that of microreactors for organic reactions.
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