Issue 38, 2017

Creasing in evaporation-driven cavity collapse


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

Article type
26 Jun 2017
10 Aug 2017
First published
22 Aug 2017
This article is Open Access
Creative Commons BY license

Soft Matter, 2017,13, 6894-6904

Creasing in evaporation-driven cavity collapse

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

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