Differences in Nanostructure and Hydrophobicity of Cicada (Cryptotympana atrata) Forewing Surface with the Distribution of Precipitation

Figure 2

SEM images of protrusions and optical photographs of the contact angles on the cicada Cryptotympana atrata wing surfaces. (a) The structure of the sample collected from Zhejiang with a contact angle of 136.1° and large contact angle hysteresis. (b) The cross section of the sample collected from Zhejiang showing the regular arrangement of protrusions. (c) The structure of the sample collected from Fujian with a contact angle of 100.8° and large contact angle hysteresis. (d) The cross section of the sample collected from Fujian showing the quasi-ordered arrangement of protrusions.

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