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          Institute: MPI für Dynamik und Selbstorganisation     Collection: Dynamik komplexer Fluide     Display Documents



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ID: 340451.0, MPI für Dynamik und Selbstorganisation / Dynamik komplexer Fluide
Switching Liquid Morphologies on Linear Grooves
Authors:Khare, Krishnacharya; Herminghaus, Stephan; Baret, Jean-Christophe; Law, Bruce M.; Brinkmann, Martin; Seemann, Ralf
Language:English
Date of Publication (YYYY-MM-DD):2007-11-15
Title of Journal:Langmuir
Volume:23
Issue / Number:26
Start Page:12997
End Page:13006
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The morphology of liquids confined to linear micrometer-sized grooves of triangular and rectangular cross section is studied for different substrate wettabilities. Depending on the wettability and exact geometry, either droplike morphologies or elongated liquid filaments represent the generic equilibrium structures on the substrate. Upon changing the apparent contact angle of aqueous drops by electrowetting, we are able to trigger the transition between elongated filaments and droplets. In the case of rectangular grooves, this transition allows us to advance liquid reversibly into the grooves while crossing a certain threshold contact angle. In triangular grooves, however, these elongated filaments undergo a dynamic instability when the contact angle returns to a value above the filling threshold. The different filling and drainage behavior is explained by specific aspects of the triangular and rectangular groove geometry.
External Publication Status:published
Document Type:Article
Communicated by:Folkert Müller-Hoissen
Affiliations:MPI für Dynamik und Selbstorganisation/Dynamik komplexer Fluide
External Affiliations:ISIS-ULP, BP 70028, 67083 Strasbourg Cedex, France
Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
Identifiers:DOI:10.1021/la701899u
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