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Issue 37, 2014
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Elastocapillary deformations on partially-wetting substrates: rival contact-line models

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Abstract

A partially-wetting liquid can deform the underlying elastic substrate upon which it rests. This situation requires the development of theoretical models to describe the wetting forces imparted by the drop onto the solid substrate, particularly those at the contact-line. We construct a general solution using a displacement potential function for the elastic deformations within a finite elastic substrate associated with these wetting forces, and compare the results for several different contact-line models. Our work incorporates internal contributions to the surface stress from both liquid/solid Σls and Σsg solid/gas solid surface tensions (surface stress), which results in a non-standard boundary-value problem that we solve using a dual integral equation. We compare our results to relevant experiments and conclude that the generalization of solid surface tension ΣlsΣsg is an essential feature in any model of partial-wetting. The comparisons also allow us to systematically eliminate some proposed contact-line models.

Graphical abstract: Elastocapillary deformations on partially-wetting substrates: rival contact-line models

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Supplementary files

Article information


Submitted
24 Apr 2014
Accepted
07 Jul 2014
First published
31 Jul 2014

Soft Matter, 2014,10, 7361-7369
Article type
Paper

Elastocapillary deformations on partially-wetting substrates: rival contact-line models

J. B. Bostwick, M. Shearer and K. E. Daniels, Soft Matter, 2014, 10, 7361
DOI: 10.1039/C4SM00891J

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