A REVIEW ON EFFECT OF ELCTROETCHING ON COPPER SUBSTRATE TO ACHIEVE SUPERHYDROPHOBICITY

Mechanical Engineering

The interest in highly water-repellent surfaces has grown in recent years due to the desire for self-cleaning surfaces. A super-hydrophobic surface is one that achieves a water contact angle of 150 ͦ or greater. This article explores the different approaches used to construct super-hydrophobic surfaces and identifies the key propertiesof each surface that contribute to its hydrophobicity.The models used to describe surface interaction with water are considered, with attention directed to the methods of contact angle analysis. A copper substrate was etched in the mixed solution by different methods to generate a desired roughened structure and surface contact angle. The morphology and microstructure of as-prepared etched Cu surface were observed with a field-emission scanning electron microscope, and its friction-reducing and anticorrosion abilities were evaluated in relation to water contact angle measurements, X-ray diffrac-tion (XRD), X-ray photoelectron spectroscopy (XPS), potentiodynamic polarizationand electrochemical impedance spectroscopy techniques. Wettability of solid surfaces is an important property and depends both on surface roughness and on surface chemistry.

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