TY - JOUR

T1 - The Influence of Hydrostatic Pressure on the Contact Angle of a Sessile Bubble

AU - Esipova, N. E.

AU - Rusanov, A. I.

AU - Sobolev, V. D.

AU - Itskov, S. V.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85073224679&partnerID=8YFLogxK

U2 - 10.1134/S1061933X1905003X

DO - 10.1134/S1061933X1905003X

M3 - Article

AN - SCOPUS:85073224679

VL - 81

SP - 507

EP - 514

JO - Colloid Journal

JF - Colloid Journal

SN - 1061-933X

IS - 5

ER -