As-placed contact angles for sessile drops

Rafael Tadmor, Preeti S. Yadav

Research output: Contribution to journalArticlepeer-review

125 Scopus citations


As-placed contact angle is the contact angle a drop adapts as a result of its placement on a surface. As expected, the as-placed contact angle, θAP, of a sessile drop on a horizontal surface decreases with the drop size due to the increase in hydrostatic pressure. We present a theoretical prediction for θAP which shows that it is a unique function of the advancing contact angle, θA, drop size, and material properties (surface tensions and densities). We test our prediction with published and new data. The theory agrees with the experiments. From the relation of the as-placed contact angle to drop size the thermodynamic equilibrium contact angle is also calculated.

Original languageEnglish
Pages (from-to)241-246
Number of pages6
JournalJournal of Colloid and Interface Science
Issue number1
StatePublished - 1 Jan 2008
Externally publishedYes


  • Advancing contact angle
  • Hydrostatic pressure
  • Interfacial tension
  • Line energy
  • Line tension
  • Receding contact angle
  • Surface tension
  • Three phase contact line
  • Young contact angle
  • Young equation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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