Volume 146, 2010

Contact angle hysteresis: a different view and a trivial recipe for low hysteresis hydrophobic surfaces

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.

Article information

Article type
Paper
Submitted
27 Nov 2009
Accepted
22 Jan 2010
First published
06 May 2010

Faraday Discuss., 2010,146, 103-111

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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