Abstract
The wetting of solid surfaces is treated. The Young and receding contact angles are experimentally unattainable values for the majority of solid surfaces. Actually, we always observe the apparent contact angle. This makes the characterization of wetting of real surfaces problematic. It is proposed in this paper to characterize wetting of real surfaces with the advancing contact angle and the minimum work of adhesion calculated according to the Dupre equation. The advancing contact angle, which depends slightly on the experimental technique used for its measurement, corresponds to the maximal solid/liquid surface tension and correspondingly to the minimal work of adhesion, calculated according to the Dupre equation.
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Acknowledgments
The author is thankful to Mrs. Ye. Bormashenko, Mrs. O. Bormashenko-Blumberg, and Mrs. Al. Musin for their help in preparing this manuscript. The author is indebted to Professor R. Tadmor for the extremely useful discussions.
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This article is part of the Topical Collection on Contact Angle Hysteresis
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Bormashenko, E. Wetting of real solid surfaces: new glance on well-known problems. Colloid Polym Sci 291, 339–342 (2013). https://doi.org/10.1007/s00396-012-2778-8
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DOI: https://doi.org/10.1007/s00396-012-2778-8