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Issue 33, 2016
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Probing effective slippage on superhydrophobic stripes by atomic force microscopy

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Abstract

While the effective slippage of water past superhydrophobic surfaces has been studied over a decade, theoretical predictions have never been properly confirmed by experiments. Here we measure a drag force on a sphere approaching a plane decorated by superhydrophobic grooves and compare the results with the predictions of semi-analytical theory developed here, which employs the gas cushion model to calculate the local slip length at the gas sectors. We demonstrate that at intermediate and large (compared to a texture period) separations the half-sum of longitudinal and transverse effective slip lengths can be deduced from the force–distance curve by using the known analytical theory of hydrodynamic interaction of a sphere with a homogeneous slipping plane. This half-sum is shown to depend on the fraction of gas sectors and its value is in excellent agreement with theoretical predictions. At small distances the half-sum of effective longitudinal and transverse slip lengths becomes separation-dependent, and is in quantitative agreement with the predictions of our semi-analytical theory.

Graphical abstract: Probing effective slippage on superhydrophobic stripes by atomic force microscopy

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Article information


Submitted
08 May 2016
Accepted
21 Jul 2016
First published
21 Jul 2016

Soft Matter, 2016,12, 6910-6917
Article type
Paper

Probing effective slippage on superhydrophobic stripes by atomic force microscopy

T. V. Nizkaya, A. L. Dubov, A. Mourran and O. I. Vinogradova, Soft Matter, 2016, 12, 6910
DOI: 10.1039/C6SM01074A

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