The Influence of Hydrostatic Pressure on the Contact Angle of a Sessile Bubble
| Autor: | N. E. Esipova, V. D. Sobolev, Anatoly I. Rusanov, S. V. Itskov |
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| Rok vydání: | 2019 |
| Předmět: |
Surface (mathematics)
Materials science 010304 chemical physics Bubble Contact line Young equation Hydrostatic pressure 02 engineering and technology Surfaces and Interfaces Mechanics 021001 nanoscience & nanotechnology 01 natural sciences Contact angle Colloid and Surface Chemistry Orientation (geometry) 0103 physical sciences Air bubble Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Colloid Journal. 81:507-514 |
| ISSN: | 1608-3067 1061-933X |
| DOI: | 10.1134/s1061933x1905003x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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