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Moulding technique demonstrates the contribution of surface geometry to the super-hydrophobic properties of the surface of a water strider

Paper ID Volume ID Publish Year Pages File Format Full-Text
2336 108 2008 5 PDF Available
Title
Moulding technique demonstrates the contribution of surface geometry to the super-hydrophobic properties of the surface of a water strider
Abstract

Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the surface, including the smallest microtrichia (200–300 nm wide, 7–9 μm long), was successfully replicated using a two-step moulding technique. The mould surface exhibited super-hydrophobic properties similar to the original insect surface. The average water contact angle (CA) of the mould was 164.7°, whereas the CA of the flat polymer was about 92°. These results show that (i) in water striders, the topography of the surface plays a dominant role in super-hydrophobicity, (ii) very low surface energy bulk material (typically smaller than 0.020 N m−1) is not necessary to achieve super-hydrophobicity; and (3) the two-step moulding technique may be used to mimic quite complex biological functional surfaces.

Keywords
Setae; Microtrichia; Cuticle; Contact angle; Patterned polymer
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Moulding technique demonstrates the contribution of surface geometry to the super-hydrophobic properties of the surface of a water strider
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 4, Issue 3, May 2008, Pages 766–770
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us