Journal
OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
Volume 56, Issue 1, Pages 9-22Publisher
EDP SCIENCES S A
DOI: 10.2516/ogst:2001002
Keywords
advancing contact angle; receding contact angle; hysteresis; equilibrium contact angle; vibrations; capillary waves
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The theory of contact angles has been developed using the concept of the Young contact angle, an equilibrium quantity related to perfectly smooth and homogeneous surfaces; on real surfaces it is commonly accepted that one can obtain metastable equilibrium states, in l,Inch the shape of the meniscus along the triple line is not fully equivalent to the equilibrium meniscus. In the present paper, a new method is presented to obtain an equilibrium contact angle with a simple modification of the Wilhelmy microbalance. The supply of acoustic energy, to the liquid at a frequency which induces the resonant formation of capillary waves, followed by the reduction of the amplitude Of the vibration, allows the meniscus to move from the metastable advancing or receding shape to the stable equilibrium one.
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