Journal
PROGRESS IN ORGANIC COATINGS
Volume 119, Issue -, Pages 123-126Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2018.02.028
Keywords
Wettability; Surface free energy; Roughness
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The significance of wettability between solid and liquid substances in different fields encourages scientists to develop accurate models to estimate the resultant apparent contact angles. Surface free energy (SFE), which is principally defined for ideal (flat) surfaces, is not applicable to predict the wettability of real (rough) surfaces. This paper introduces a new parameter, namely normalized surface free energy (NSFE) as a combination of SFE and roughness, to predict the contact angle of liquids on non-ideal low-energy surfaces. The remarkable consistency of the predicted and measured contact angles of liquids on some rough surfaces also confirm the validity of the approach.
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