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Solid surface tension measured by a liquid drop under a solid film.

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.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Nadermann N,Hui CY,Jagota A

doi

10.1073/pnas.1304587110

subject

Has Abstract

pub_date

2013-06-25 00:00:00

pages

10541-5

issue

26

eissn

0027-8424

issn

1091-6490

pii

1304587110

journal_volume

110

pub_type

杂志文章

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