Asymmetric Wetting Hysteresis on Hydrophobic Microstructured Surfaces

The wetting behavior of hydrophobic, microstructured surfaces containing arrays of pillars or holes has been investigated. The size of the surface features was fixed (20 μm), while their separation was varied to adjust the area fraction (0−80%). The wettability of structured surfaces for liquids res...

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Published in:Langmuir 2009-05, Vol.25 (10), p.5655-5660
Main Authors: Priest, Craig, Albrecht, Trent W. J, Sedev, Rossen, Ralston, John
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Surface physical chemistry
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description The wetting behavior of hydrophobic, microstructured surfaces containing arrays of pillars or holes has been investigated. The size of the surface features was fixed (20 μm), while their separation was varied to adjust the area fraction (0−80%). The wettability of structured surfaces for liquids resting in the Cassie state is strongly dependent on the continuity of the solid component. Microstructured square pillars and holes showed distinct, asymmetric wetting hysteresis, consistent with our previous observations on flat, chemically heterogeneous surfaces. Furthermore, clear trends for the magnitude of contact angle hysteresis versus area fraction for the two types of microstructured surfaces are evident. The pinning energy associated with these surface features is estimated.
doi_str_mv 10.1021/la804246a
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subjects Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Surface physical chemistry
title Asymmetric Wetting Hysteresis on Hydrophobic Microstructured Surfaces
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