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Volume 146, 2010
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Contact angle hysteresis: a different view and a trivial recipe for low hysteresis hydrophobic surfaces

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Abstract

Contact angle hysteresis is addressed from two perspectives. The first is an analysis of the events that occur during motion of droplets on superhydrophobic surfaces. Hysteresis is discussed in terms of receding contact line pinning and the tensile failure of capillary bridges. The sign of the curvature of the solid surface is implicated as playing a key role. The second is the report of a new method to prepare smooth low hysteresis surfaces. The thermal treatment of oxygen plasma-cleaned silicon wafers with trimethylsilyl-terminated linear poly(dimethylsiloxane) (PDMS - commercial silicone oils) in disposable glass vessels is described. This treatment renders silicon/silica surfaces that contain covalently attached PDMS chains. The grafted layers of nanometre scale thickness are liquid-like (rotationally dynamic at room temperature), decrease activation barriers for contact line motion and minimize water contact angle hysteresis. This simple method requires neither sophisticated techniques nor substantial laboratory skills to perform.

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Publication details

The article was received on 27 Nov 2009, accepted on 22 Jan 2010 and first published on 06 May 2010


Article type: Paper
DOI: 10.1039/B925045J
Citation: Faraday Discuss., 2010,146, 103-111
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    Contact angle hysteresis: a different view and a trivial recipe for low hysteresis hydrophobic surfaces

    J. W. Krumpfer and T. J. McCarthy, Faraday Discuss., 2010, 146, 103
    DOI: 10.1039/B925045J

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