Evidence of the No-Slip Boundary Condition of Water Flow between Hydrophilic Surfaces Using Atomic Force Microscopy

Langmuir ◽  
2009 ◽  
Vol 25 (20) ◽  
pp. 12002-12005 ◽  
Author(s):  
Abdelhamid Maali ◽  
Yuliang Wang ◽  
Bharat Bhushan
Keyword(s):  
Boundary Condition ◽  
Atomic Force Microscopy ◽  
Water Flow ◽  
Slip Boundary Condition ◽  
Force Microscopy ◽  
Slip Boundary ◽  
Hydrophilic Surfaces ◽  
Atomic Force

scholarly journals Slip-mediated dewetting of polymer microdroplets

2016 ◽  
Vol 113 (5) ◽  
pp. 1168-1173 ◽  
Author(s):  
Joshua D. McGraw ◽  
Tak Shing Chan ◽  
Simon Maurer ◽  
Thomas Salez ◽  
Michael Benzaquen ◽  
...  
Keyword(s):  
Boundary Condition ◽  
Contact Line ◽  
Stokes Equations ◽  
Slip Boundary Condition ◽  
Scaling Analysis ◽  
Self Assembled Monolayer ◽  
Spherical Cap ◽  
Force Microscopy ◽  
Navier Slip ◽  
Slip Boundary

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.

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