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Biomimetics 2017, 2(1), 2;

Fabrication of Mechanically Stable Superhydrophobic Aluminium Surface with Excellent Self-Cleaning and Anti-Fogging Properties

Department of Chemical Engineering, National Institute of Technology Rourkela, Odisha 769008, India
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Carbone
Received: 31 December 2016 / Revised: 12 February 2017 / Accepted: 16 February 2017 / Published: 23 February 2017
(This article belongs to the Special Issue Micro- and Nano-Structured Bio-Inspired Surfaces)
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The development of a self-cleaning and anti-fogging superhydrophobic coating for aluminium surfaces that is durable in aggressive conditions has raised tremendous interest in materials science. In this work, a superhydrophobic Al surface was synthesized by employing chemical etching technique with a mixture of hydrochloric and nitric acids, followed by passivation with lauric acid. The surface morphology analysis revealed the presence of rough microstructures on the coated Al surface. Superhydrophobicity with water contact angle of 170 ± 3.9° and sliding angle of 4 ± 0.5° was achieved. The surface bounced off the high-speed water jet, indicating the excellent water-repellent nature of the coating. It also continuously floated on a water surface for four weeks, showing its excellent buoyancy. Additionally, the coating maintained its superhydrophobicity after undergoing 100 cycles of adhesive tape peeling test. Its superhydrophobic nature withstood 90° and 180° bending and repeated folding and de-folding. The coating exhibits an excellent self-cleaning property. In a low temperature condensation test, almost no accumulation of water drops on the surface showed the excellent anti-fogging property of the coating. This approach can be applied to any size and shape of Al surface, and hence has great industrial applications. View Full-Text
Keywords: superhydrophobic; water-repellent; chemical etching; self-cleaning; anti-fogging superhydrophobic; water-repellent; chemical etching; self-cleaning; anti-fogging

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Varshney, P.; Mohapatra, S.S.; Kumar, A. Fabrication of Mechanically Stable Superhydrophobic Aluminium Surface with Excellent Self-Cleaning and Anti-Fogging Properties. Biomimetics 2017, 2, 2.

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