The effect of polymer surface on the wetting and adhesion of liquid systems
- 1 January 2007
- journal article
- Published by Taylor & Francis Ltd in Journal of Adhesion Science and Technology
- Vol. 21 (3-4), 227-241
- https://doi.org/10.1163/156856107780684567
Abstract
Young's equation describes the wetting phenomenon in terms of the contact angle between a liquid and a solid surface. However, the contact angle is not the only parameter that defines liquid–solid interactions, an additional parameter related to the adhesion between the liquid drop and the solid surface is also of importance in cases where liquid sliding is involved. It is postulated that wetting which is related to the contact angle, and interfacial adhesion, which is related to the sliding angle, are interdependent phenomena and have to be considered simultaneously. A variety of models that relate the sliding angle to the forces developed along the contact periphery between a liquid drop and a solid surface have been proposed in the literature. Here, a modified model is proposed that quantifies the drop-sliding phenomenon, based also on the interfacial adhesion that develops across the contact area of the liquid/solid interface. Consequently, an interfacial adhesion strength parameter can be defined depending on the mass of the drop, the contact angle and the sliding angle. To verify the proposed approach the adhesion strength parameter has been calculated, based on experimental results, for a number of polymer surfaces and has been correlated with their composition and structure. The interaction strength parameter can be calculated for any smooth surface from measurements of the contact and the sliding angles.Keywords
This publication has 17 references indexed in Scilit:
- Effects of the Surface Roughness on Sliding Angles of Water Droplets on Superhydrophobic SurfacesLangmuir, 2000
- Characterization of molecular interfaces in hydrophobic systemsProgress in Organic Coatings, 1997
- Liquid Drops on an Inclined Plane: The Relation between Contact Angles, Drop Shape, and Retentive ForceJournal of Colloid and Interface Science, 1995
- Interactions between heterogeneous surfaces of polymers and waterJournal of Applied Polymer Science, 1994
- The sliding of sessile and pendent droplets the critical conditionColloids and Surfaces, 1991
- On the ability of drops or bubbles to stick to non-horizontal surfaces of solids. Part 2. Small drops or bubbles having contact angles of arbitrary sizeJournal of Fluid Mechanics, 1985
- On the ability of drops or bubbles to stick to non-horizontal surfaces of solidsJournal of Fluid Mechanics, 1983
- Studies at phase interfaces. I. The sliding of liquid drops on solid surfaces and a theory for spray retentionJournal of Colloid Science, 1962
- Bestimmung der Haftfähigkeit von Flüssigkeiten an festen Körpern mit der AbreißwinkelmethodeColloid and Polymer Science, 1956
- III. An essay on the cohesion of fluidsPhilosophical Transactions of the Royal Society of London, 1805