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Beyond the Navier-de Gennes paradigm : slip inhibition on ideal substrates

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Title: Beyond the Navier-de Gennes paradigm : slip inhibition on ideal substrates
Authors: Ilton, Mark Browse this author
Salez, Thomas Browse this author
Fowler, Paul D. Browse this author
Rivetti, Marco Browse this author
Aly, Mohammed Browse this author
Benzaquen, Michael Browse this author
McGraw, Joshua D. Browse this author
Raphaël, Elie Browse this author
Dalnoki-Veress, Kari Browse this author
Bäumchen, Oliver Browse this author
Issue Date: 21-Mar-2018
Publisher: Springer Nature
Journal Title: Nature Communications
Volume: 9
Start Page: 1172
Publisher DOI: 10.1038/s41467-018-03610-4
Abstract: Hydrodynamic slip of a liquid at a solid surface represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For polymeric liquids, de Gennes predicted that the Navier boundary condition together with the theory of polymer dynamics imply extraordinarily large interfacial slip for entangled polymer melts on ideal surfaces; this prediction was confirmed using dewetting experiments on ultra-smooth, low-energy substrates. Here, we use capillary leveling -- surface tension driven flow of films with initially non-uniform thickness -- of polymeric films on these same substrates. Measurement of the slip length from a robust one-parameter fit to a lubrication model is achieved. We show that at the lower shear rates involved in leveling experiments as compared to dewetting ones, the employed substrates can no longer be considered ideal. The data is instead consistent with physical adsorption of polymer chains at the solid/liquid interface. We extend the Navier-de Gennes description using one additional parameter, namely the density of physically adsorbed chains per unit surface. The resulting model is found to be in excellent agreement with the experimental observations.
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Type: article (author version)
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)


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