Abstract
In this paper, water boatman, an insect which lives in water was observed. It is found that there exists hydrophobicity and superhydrophobicity on the surface of insect’s abdomen, dorsa and hind wings. The water contact angle and glide angle on the hind wings was about 159° and 8°, respectively. It reveals that the micro and nanometer hierarchical structures of abdomen, dorsa and hind wings play a crucial role for the formation of hydrophobicity and superhydrophobicity. Possessions of hydrophobicity and superhydrophobicty enable waterman to swim upward or downward, breath freely in water or take off from water under unfavorable condition. Finally, the formation mechanism of superhydrophobicity was discussed on the basis of Cassie’s theory.
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