NDLI: Solid-supported thin elastomer films deformed by microdrops

Content Provider	Royal Society of Chemistry (RSC)
Author	Lorenzoni, Simone Raiteri, Roberto Auernhammer, Günter K. Pericet-Camara, Ramon Koynov, Kaloian Bonaccurso, Elmar
Copyright Year	2009
Abstract	A sessile droplet can deform the surface of a soft solid not only with its weight. The surface tension pulls up a ridge at the perimeter of the drop, and the capillary pressure embosses a quasi-spherical dimple underneath the drop. This holds for the case of a bulk solid. However, if the solid forms a film with thickness comparable to the deformation scale the shape and the depth of the dimple are strongly distorted. We investigated dimples on elastomer films with a Young's modulus of 25 kPa and thickness in the range 4–104 µm embossed by sessile ionic liquid droplets. The films are supported by an undeformable glass slide. Below a certain critical film thickness, the dimple is shallower and the ridge at the drop rim is less elevated than for the bulk elastomer. The deviations are more pronounced for thinner films. Further, troughs form at the two sides of the ridge. Their distance from the rim is equivalent to the layer thickness. The measurements are qualitatively reproduced by an analytical model and quantitatively by numerical simulations. A consistent physical picture of the deformation on the bulk elastomer and of the distortions on the thin films is given.
Starting Page	3611
Ending Page	3617
Page Count	7
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	5
Issue Number	19
Journal	Soft Matter
DOI	10.1039/b907212h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Elastomer Micrometre Leaf Surface tension Pascal (unit) Ionic liquid
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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