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Abstract: In order to characterize very weak adhesive surfaces, we have developed aquantitative test inspired by the Johnson, Kendall, and Roberts adhesion testfor soft adhesives, which relies on the formation and then the rupture of acapillary bridge between the surface to be tested and a liquid bath. Both theshape and the kinetics of breakage of the capillary bridge for various coatingsput into contact with liquids of various viscosities and surface tensions havebeen studied. Several pull off regimes can be distinguished. For low pull offvelocities, a quasi-static regime is observed, well described by capillaryequations and sensitive to the hysteresis of the contact angle of the fluid onthe coating. Above a critical pull off velocity that depends on the fluidviscosity, a dynamic regime is observed, characterized by the formation of aflat pancake of fluid on the coating that recedes more slowly than thecapillary bridge itself. After the breakage of the capillary bridge, a smalldrop can remain attached to the surface. The volume of this drop depends on thedynamical regime and is strongly affected by very small differences between thecoatings. The aptitude of this test in characterizing very weakly adhesivesurfaces is exemplified by a comparison between three different perfluorinatedcoatings.



Author: Laurianne Vagharchakian LPS, Frederic Restagno LPS, Liliane Leger LPS

Source: https://arxiv.org/



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