How Wenzel and cassie were wrong.

@article{Gao2007HowWA,
  title={How Wenzel and cassie were wrong.},
  author={Lichao Gao and Thomas J. McCarthy},
  journal={Langmuir : the ACS journal of surfaces and colloids},
  year={2007},
  volume={23 7},
  pages={
          3762-5
        }
}
  • L. Gao, T. J. McCarthy
  • Published 2007
  • Chemistry, Medicine
  • Langmuir : the ACS journal of surfaces and colloids
We argue using experimental data that contact lines and not contact areas are important in determining wettability. Three types of two-component surfaces were prepared that contain "spots" in a surrounding field: a hydrophilic spot in a hydrophobic field, a rough spot in a smooth field, and a smooth spot in a rough field. Water contact angles were measured within the spots and with the spot confined to within the contact line of the sessile drop. Spot diameter and contact line diameter were… Expand
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It is reported that the contact angle is independent of area void fraction for surfaces with microcavities, which correspond to situations when the advancing contact line is continuous, in contrast with Cassie-Baxter theory, which uses areavoid fraction as the determining parameter, regardless of the type of roughness. Expand
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Apparent contact angles are totally governed by the area of the solid surface adjacent to the triple (three-phase) line. However, apparent contact angles do not describe the wetting situation… Expand
Contact angle and local wetting at contact line.
  • Ri Li, Y. Shan
  • Medicine
  • Langmuir : the ACS journal of surfaces and colloids
  • 2012
TLDR
This theoretical study was motivated by recent experiments and theoretical work that had suggested the dependence of the static contact angle on the local wetting at the triple-phase contact line and suggests that the wetting described by the Wenzel and Cassie equations is also the local soaking of the contact line rather than the global wetting of the droplet. Expand
Contact line characteristics of liquid–gas interfaces over grooved surfaces
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