Journal
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
Volume 18, Issue 1, Pages 29-37Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1163/156856104322746983
Keywords
contact angle; Wilhelmy balance; serrated surfaces; Cassie equation
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The Wilhelmy balance technique can be used to assess the wettability of rectangular samples with two differently treated faces. The contact angle on the treated face can be reliably deduced, provided that a consistent value for the contact an le on the untreated face has been obtained. As an example, a hydrophobic plate with various serrations on one face only is examined in detail. The agreement between the experimentally determined contact angles and the angles predicted by the Cassie equation is very good. We demonstrate that there are no methodological reasons to reject the use of the Wilhemy technique for samples which have received different physical or chemical treatments on the two faces.
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