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Issue 38, 2017

Creasing in evaporation-driven cavity collapse

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Abstract

We report on crease morphology and evolution at the surface of contracting cavities embedded within elastomeric solids of varying composition (Sylgard 184: pre-polymer to crosslinker mixing ratios of 10 : 1, 12 : 1, 17.5 : 1, and 25 : 1). Cavity contraction is achieved through evaporation of an embedded 10 μL liquid droplet. In validation of recent theoretical predictions, strain-stiffening modeled via the Gent constitutive relation [Jin and Suo, JMPS, 2015, 74, 68–79] is found to govern both crease onset and crease density. Specifically, crease onset matches prediction using only experimentally-measured parameters. Neo-Hookean solids are found to prefer initiating creasing with many short creases that join to form a collapsed state with only a few creases, whereas creasing in Gent solids initiates with a few creases that propagate across the cavity surface. These experimental observations are explained by energy minimization using finite element simulation of a cylindrical crease geometry.

Graphical abstract: Creasing in evaporation-driven cavity collapse

Supplementary files

Article information


Submitted
26 Jun 2017
Accepted
10 Aug 2017
First published
22 Aug 2017

This article is Open Access

Soft Matter, 2017,13, 6894-6904
Article type
Paper

Creasing in evaporation-driven cavity collapse

M. P. Milner, L. Jin and S. B. Hutchens, Soft Matter, 2017, 13, 6894 DOI: 10.1039/C7SM01258F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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