Persistent droplet motion in liquid-liquid dewetting

When a nonvolatile liquid film dewets from a partly compatible liquid substrate, the advancing dewetting front leaves behind droplets formed through a Rayleigh instability mechanism at its rim. We have found that these droplets continue to move in the direction of the dewetting front for extended pe...

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Bibliographic Details
Published in:Physical review letters 2004-06, Vol.92 (23), p.236104.1-236104.4, Article 236104
Main Authors: ORON, Matti, KERLE, Tobias, YERUSHALMI-ROZEN, Rachel, KLEIN, Jacob
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fluid surfaces and fluid-fluid interfaces
Physics
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:When a nonvolatile liquid film dewets from a partly compatible liquid substrate, the advancing dewetting front leaves behind droplets formed through a Rayleigh instability mechanism at its rim. We have found that these droplets continue to move in the direction of the dewetting front for extended periods (of order one day) with an initial droplet velocity varying linearly with the droplet size, and a displacement varying logarithmically with time. We attribute this persistent motion to a transient surface tension gradient on the substrate liquid surface trailing the dewetting front.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.236104