A simple and economic approach to superhydrophobic films

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Abstract

It has been recognized that a simple and economic preparation of superhydrophobic films is the prerequisite for their industrial and commercial applications. In this work, superhydrophobic films were successfully achieved on insulating materials. For such films, the contact angle can reach a maximum of 151.8° (sliding angle about 8°) with a surface roughness of 10.88 μm. If surface roughness was less than 10.88 μm, the contact angle increased with roughness, but for roughness greater than 10.88 μm, the contact angle decreased with roughness. It was further revealed that the surface hierarchical structures of the films were responsible for such a high contact angle and a low sliding angle. Moreover, the wetting ability of the rough films was different and can be interpreted using the different wetting state models. In addition, sandstorm tests and hydrophobicity experiments showed that such films could resist the external force well and exhibit a durable superhydrophobicity.

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Design and Creation of Superwetting/Antiwetting Surfaces

X. J. Feng, L Jiang, Yinmin Wang (2007)

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Anti-icing superhydrophobic coatings.

Liangliang Cao, Andrew Jones, Vinod Sikka … (2009)

We use nanoparticle-polymer composites to demonstrate the anti-icing capability of superhydrophobic surfaces and report direct experimental evidence that such surfaces are able to prevent ice formation upon impact of supercooled water both in laboratory conditions and in natural environments. We find that the anti-icing capability of these composites depends not only on their superhydrophobicity but also on the size of the particles exposed on the surface. The critical particle sizes that determine the superhydrophobicity and the anti-icing property are in two different length scales. The effect of particle size on ice formation is explained by using a classical heterogeneous nucleation theory. This result implies that the anti-icing property of a surface is not directly correlated with the superhydrophobicity, and thus, it is uncertain whether a superhydrophobic surface is anti-icing without detailed knowledge of the surface morphology. The result also opens up possibilities for rational design of anti-icing superhydrophobic surfaces by tuning surface textures in multiple length scales.