Probing effective slippage on superhydrophobic stripes by atomic force microscopyстатья

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Дата последнего поиска статьи во внешних источниках: 28 октября 2016 г.

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[1] Probing effective slippage on superhydrophobic stripes by atomic force microscopy / T. V. Nizkaya, A. L. Dubov, A. Mourran, O. I. Vinogradova // Soft Matter. — 2016. — Vol. 12. — P. 6910–6917. 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. [ DOI ]

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