Precursors to Molecular Slip on Smooth Hydrophobic Surfaces

Experiments and simulations suggest that simple liquids may experience slip while flowing near a smooth, hydrophobic surface. Here we show how precursors to molecular slip can be observed in the complex response of a liquid to oscillatory shear. We measure both the change in frequency and bandwidth...

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Bibliographic Details
Published in:Physical review letters 2018-09, Vol.121 (13), p.134501-134501
Main Authors: Pye, Justin E, Wood, Clay E, Burton, Justin C
Format: Article
Language:English
Subjects:
Crystal growth
Hydrophobic surfaces
Hydrophobicity
Microbalances
Precursors
Quartz crystals
Self-assembled monolayers
Self-assembly
Slip
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Summary:Experiments and simulations suggest that simple liquids may experience slip while flowing near a smooth, hydrophobic surface. Here we show how precursors to molecular slip can be observed in the complex response of a liquid to oscillatory shear. We measure both the change in frequency and bandwidth of a quartz crystal microbalance during the growth of a single drop of water immersed in an ambient liquid. By varying the hydrophobicity of the surface using self-assembled monolayers, our results show little or no slip for water on all surfaces. However, we observe excess transverse motion near hydrophobic surfaces due to weak binding in the corrugated surface potential, an essential precursor to slip. We also show how this effect can be easily missed in simulations utilizing finite-ranged interaction potentials.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.134501