Slip-mediated dewetting of polymer microdroplets

McGraw, Joshua D., Chan, Tak Shing, Maurer, Simon, Salez, Thomas, Benzaquen, Michael, Raphaël, Elie, Brinkmann, Martin and Jacobs, Karin (2016) Slip-mediated dewetting of polymer microdroplets. Proceedings of the National Academy of Sciences, 113 (5). pp. 1168-1173. ISSN 0027-8424

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Classical hydrodynamic models predict that infinite work is required to move a three-phase contact line, defined here as the line where a liquid/vapor interface intersects a solid surface. Assuming a slip boundary condition, in which the liquid slides against the solid, such an unphysical prediction is avoided. In this article, we present the results of experiments in which a contact line moves and where slip is a dominating and controllable factor. Spherical cap-shaped polystyrene microdroplets, with nonequilibrium contact angle, are placed on solid self-assembled monolayer coatings from which they dewet. The relaxation is monitored using in situ atomic force microscopy. We find that slip has a strong influence on the droplet evolutions, both on the transient nonspherical shapes and contact line dynamics. The observations are in agreement with scaling analysis and boundary element numerical integration of the governing Stokes equations, including a Navier slip boundary condition.

Item Type: Article
Uncontrolled Keywords: slip, contact line motion, free-surface flows, microflows, nanoflows
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 10 Oct 2019 17:13
Last Modified: 10 Oct 2019 17:13

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