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Superhydrophobic Nanocrystalline Nickel Films Inspired by Lotus Leaf

Published online by Cambridge University Press:  15 March 2011

Mehdi Shafiei  and
Ahmet T. Alpas
Mehdi Shafiei
Affiliation:
Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, ON N9b3P4, Canada
Ahmet T. Alpas
Affiliation:
Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, ON N9b3P4, Canada
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Abstract

A new method to fabricate superhydrophobic hard films is described. Surface texture of lotus leaf was replicated on an acetate film, on which a nanocrystalline (NC) Ni coating with a grain size of 30 ± 4 nm and a hardness of 4.42 GPa was electrodeposited. The surface texture consisted of conical protuberances with a height of 10.0 ± 2.0 0m and a tip radius of 2.5 ± 0.5 0m. An additional electrodeposition for 120 s and 300 s was used to locally modify the surface structure by depositing ‘Ni crowns' on the protuberances that increased their height to 14.0 ± 2.0 0m and their tip radius to 6.0 ± 0.5 0m. The modified structures were then treated with a perfluoropolyether (PFPE) solution, which provided a high water contact angle of 156°, i.e., comparable to the naturally superhydrophobic lotus leaf. The increased hydrophobicity as a result of surface structure and chemistry modifications was evident compared to a smooth NC Ni sample, which had a contact angle of 64°.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1132: Symposium Z – Mechanics of Biological and Biomedical Materials , 2008 , 1132-Z07-17
Copyright
Copyright © Materials Research Society 2009

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References

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