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Universal, geometry-driven hydrophobic behaviour of bare metal nanowire clusters

机译：裸露的纳米线簇的通用的，几何学驱动的疏水行为

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摘要

A parallel array of isolated metal nanowires is expected to be hydrophilic. We show, however, that a clustering of such nanowires brought about by vacuum drying produces a 'dual-scale roughness' and confers a strongly hydrophobic property to the surface. The mean size of the nanowire clusters as well as the contact angle are both found to be related to the wire length, and the critical wire length above which the surface becomes hydrophobic is approximate to 10 mu m. Surface roughness is generally known to enhance water-repellent properties, but this is the first report of roughness-induced hydrophobicity on a bare (uncoated) metallic surface.
机译：隔离金属纳米线的平行阵列有望具有亲水性。但是，我们表明，通过真空干燥产生的此类纳米线簇会产生“双尺度粗糙度”，并赋予表面强疏水性。发现纳米线簇的平均尺寸以及接触角均与导线长度有关，并且在其上表面变为疏水性的临界导线长度约为10μm。通常已知表面粗糙度会增强疏水性，但这是在裸露（未涂覆）金属表面上粗糙度引起的疏水性的首次报道。

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