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Short and long time drop dynamics on lubricated substrates
KTH / Harvard University, Cambridge, United States / Princeton University, Princeton, United States.
Korea Advanced Institute of Science and Technology, Daejeon, South Korea / Princeton University, Princeton, United States.
Princeton University, Princeton, United States.
2013 (engelsk)Inngår i: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 104, nr 3, artikkel-id 34008Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

Liquid infiltrated solids have been proposed as functional solvent-phobic surfaces for handling single and multiphase flows. Implementation of such surfaces alters the interfacial transport phenomenon as compared to a dry substrate. To better understand the interface characteristics in such systems we study experimentally the dynamics of a pendant water drop in air that contacts a substrate coated by thin oil films. At short times the water drop is deformed by the oil that spreads onto the water-air interface, and the dynamics are characterized by inertial and viscous regimes. At late times, the the oil film under the drop relaxes either to a stable thin film or ruptures. In the thin film rupture regime, we measure the waiting time for the rupture as a function of the drop equilibrium contact angle on a dry substrate and the initial film height. The waiting time is rationalized by lubrication theory, which indicates that long-range intermolecular forces destabilize the oil-water interface and is the primary mechanism for the film drainage.

sted, utgiver, år, opplag, sider
2013. Vol. 104, nr 3, artikkel-id 34008
Emneord [en]
Thin Liquid-Films, Range Forces, Surfaces, Coalescence
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URN: urn:nbn:se:sh:diva-30112DOI: 10.1209/0295-5075/104/34008ISI: 000328564200014Scopus ID: 2-s2.0-84890519250OAI: oai:DiVA.org:sh-30112DiVA, id: diva2:932470
Forskningsfinansiär
Swedish Research CouncilTilgjengelig fra: 2014-01-20 Laget: 2016-06-01 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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