Microstructure and wettability on the elytral surface of aquatic beetle

Sun, Mingxia, Liang, Aiping, Watson, Gregory S., Watson, Jolanta A., Zheng, Yongmei, and Jiang, Lei (2014) Microstructure and wettability on the elytral surface of aquatic beetle. Applied Mechanics and Materials, 461. pp. 731-740.

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The microstructures on elytral surface of aquatic beetles belonging to Hydrophilidae and Dytiscidae were observed under an environment scanning microscope, and the wettabilities were determined with an optical contact angle meter. The results show the elytral surfaces are relatively smooth compared to the structures of other insects such as the butterfly wing scales or cicada wing protrusions. They exhibit a polygonal structuring with grooves and pores being the main constituent units. The contact angles (CAs) range from 47.1o to 82.1o. The advancing and receding angles were measured by injecting into and withdrawing a small amount of water on the most hydrophilic (with a contact angle of 47.1o) and hydrophobic (with a contact angle of 82.1o) elytral surfaces, which illustrates the vital role of three-phase contact line (TCL) in the wetting mechanism of aquatic beetle elytral surfaces.

Item ID: 38791
Item Type: Article (Research - C1)
ISSN: 1662-7482
Keywords: bionic, contact angle hyteresis, elytral surface, microstructure, wettability
Funders: Chinese Academy of Sciences (CAS), National Basic Research Program of China (NBRP), National Science Fund for Fostering Talents in Basic Research, Key Laboratory of the Zoological Systematics and Evolution of the Chinese Academy of Sciences
Projects and Grants: CAS Grant No. KSCX2-EW-G-4, CAS Grant No. O529YX5105, NBRP Grant No. 2011CB302102, NSFC- J1210002
Date Deposited: 20 May 2015 00:28
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