The Influence of Hydrostatic Pressure on the Contact Angle of a Sessile Bubble

N. E. Esipova, A. I. Rusanov, V. D. Sobolev, S. V. Itskov

Research output

7 Citations (Scopus)

Abstract

Abstract: Although usual pressures have typically a weak effect on the properties of condensed phases and their surface layers, a parameter has been found in the surface physical chemistry—a contact angle at a three-phase contact line—that is rather sensitive to hydrostatic pressure. Experiments with an air bubble adhered to a solid surface immersed in water have shown that an increase in the hydrostatic pressure by less than two times causes a growth of the contact angle by more than 10°, if the angle is markedly smaller than 90°. Therewith, the three-phase contact line remains immobile, and only the liquid−gas interface changes its orientation. If the angle (no matter, acute or obtuse) is close to 90°, the three-phase contact line acquires mobility as an alternative way to reach an equilibrium. A thermodynamic theory has been developed on the basis of the generalized Young equation to explain these phenomena. It has been shown that, when the three-phase contact line is fixed, a growth of the pressure in a liquid always leads to a rise in the contact angle.

Original languageEnglish
Pages (from-to)507-514
Number of pages8
JournalColloid Journal
Volume81
Issue number5
DOIs
Publication statusPublished - 1 Sep 2019

Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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