Wetting properties on nanostructured surfaces of cicada wings

Sun, Mingxia, Watson, Gregory S., Zheng, Yongmei, Watson, Jolanta A., and Liang, Aiping (2009) Wetting properties on nanostructured surfaces of cicada wings. Journal of Experimental Biology, 212 (19). pp. 3148-3155.

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This study has investigated the wettability of forewings of 15 species of cicadas, with distinctly different wetting properties related to their nanostructures. The wing surfaces exhibited hydrophilic or weak to strong hydrophobic properties with contact angles ranging from 76.8deg. to 146.0deg. The nanostructures (protrusions), observed using environmental scanning electron microscopy (ESEM), were classified into four types according to the patterning, diameter (82–148 nm), spacing (44–117nm) and height (159–446nm). Surface analysis by X-ray photoelectron spectroscopy (XPS) showed significant differences in wing membrane chemistry. Thus, wetting properties at the macroscopic scale were dependent on slight differences in nanoscale architecture and composition of the wax layer. This investigation offers insights into the diversity of nanostructuring and how subtle small-scale changes may facilitate large changes in wettability.

Item ID: 9997
Item Type: Article (Research - C1)
ISSN: 1477-9145
Keywords: cicada; forewing; nanostructure; chemistry; hydrophobicity
Date Deposited: 15 Apr 2010 03:54
FoR Codes: 02 PHYSICAL SCIENCES > 0299 Other Physical Sciences > 029901 Biological Physics @ 80%
09 ENGINEERING > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 40%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 40%
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 20%
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