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Issue 1, 2009
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Some thoughts on superhydrophobic wetting

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Abstract

Surface roughness has a profound influence on the wetting properties of a material. This fact is especially true with respect to the wetting of superhydrophobic surfaces. As a result of a special surface structure, a drop of water brought into contact with such a material forms an almost perfect sphere and even a very slight tilting of the superhydrophobic object is sufficient to cause the drop to roll off. For the description of the behavior of drops on rough surfaces two theories, namely those of Cassie and Wenzel, are often employed. However, it is currently becoming well established that both models explain the wetting behavior more from a qualitative or practical point of view rather than giving a quantitative description. For a prediction of actual contact angles, a more complex description is required that, next to thermodynamics, takes into account the kinetics of wetting. In this article, we focus on a few key aspects of superhydrophobic wetting, namely the characterization of superhydrophobic surfaces, models for the movement of drops, transitions between the Cassie and Wenzel states, and the behavior of superhydrophobic materials under condensation.

Graphical abstract: Some thoughts on superhydrophobic wetting

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Publication details

The article was received on 11 Jul 2008, accepted on 10 Sep 2008 and first published on 01 Dec 2008


Article type: Review Article
DOI: 10.1039/B811945G
Citation: Soft Matter, 2009,5, 51-61
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    Some thoughts on superhydrophobic wetting

    C. Dorrer and J. Rühe, Soft Matter, 2009, 5, 51
    DOI: 10.1039/B811945G

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