Effects of Methanol on Wettability of the Non-Smooth Surface on Butterfly Wing |
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Authors: | Yan Fang Gang Sun Qian Cong Guang-hua Chen Lu-quan Ren Key Laboratory of Terrain-Machine Bionics Engineering Jilin University Changchun PRChina School of Life Science Changchun Normal University Changchun PRChina |
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Institution: | Yan Fang1,2,Gang Sun1,Qian Cong1,Guang-hua Chen1,Lu-quan Ren1 1.Key Laboratory of Terrain-Machine Bionics Engineering(Ministry of Education,China),Jilin University,Changchun 130022,P.R.China 2.School of Life Science,Changchun Normal University,Changchun 130032,P.R.China |
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Abstract: | The contact angles of distilled water and methanol solution on the wings of butterflies were determined by a visual contact angle measuring system. The scale structures of the wings were observed using scanning electron microscopy, The influence of the scale micro- and ultra-structure on the wettability was investigated. Results show that the contact angle of distilled water on the wing surfaces varies from 134.0° to 159.2°. High hydrophobicity is found in six species with contact angles greater than 150°. The wing surfaces of some species are not only hydrophobic but also resist the wetting by methanol solution with 55% concentration. Only two species in Parnassius can not resist the wetting because the micro-structure (spindle-like shape) and ultra-structure (pinnule-like shape) of the wing scales are remarkably different from that of other species. The concentration of methanol solution for the occurrence of spreading/wetting on the wing surfaces of different species varies from 70% to 95%. After wetting by methanol solution for 10 min, the distilled water contact angle on the wing surface increases by 0.8°-2.1°, showing the promotion of capacity against wetting by distilled water. |
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Keywords: | non-smooth surface butterfly wing scale wettability micro/ultra-structure |
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