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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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Publication details

The article was received on 08 May 2016, accepted on 21 Jul 2016 and first published on 21 Jul 2016


Article type: Paper
DOI: 10.1039/C6SM01074A
Citation: Soft Matter, 2016,12, 6910-6917
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    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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