期刊
BIOLOGY OPEN
卷 6, 期 8, 页码 1209-1218出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/bio.026070
关键词
Wetting; Bug biomimetics; Reflectance; Camouflage; Liquid-surface interaction; Laser structuring; Microstructures
类别
资金
- European program H2020 Furture and Emerging Technologies Open [665337 LiNaBioFluid]
- Osterreichische Forschungsforderungsgesellschaft (FFG) [853482]
The neotropical flat bug species Dysodius lunatus and Dysodius magnus show a fascinating camouflage principle, as their appearance renders the animal hardly visible on the bark of trees. However, when getting wet due to rain, bark changes its colour and gets darker. In order to keep the camouflage effect, it seems that some Dysodius species benefit from their ability to hold awater film on their cuticle and therefore change their optical properties when also wetted by water. This camouflage behaviour requires the insect to have a hydrophilic surface and passive surface structures which facilitate the liquid spreading. Here we show morphological and chemical characterisations of the surface, especially the cuticular waxes of D. magnus. Scanning electron microscopy revealed that the animal is covered with pillar-like microstructures which, in combination with a surprising chemical hydrophilicity of the cuticle waxes, render the bug almost superhydrophilic: water spreads immediately across the surface. We could theoretically model this behaviour assuming the effect of hemi-wicking (a state in which a droplet sits on a rough surface, partwise imbibing the structure around). Additionally the principle was abstracted and a laser-patterned polymer surface, mimicking the structure and contact angle of Dysodius wax, shows exactly the behaviour of the natural rolemodel-immediate spreading of water and the formation of a thin continuous water film changing optical properties of the surface.
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