Dual wettability on diarylethene microcrystalline surface mimicking a termite wing
Dual wettability on diarylethene microcrystalline surface mimicking a termite wing
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DOI：
10.1038/s42004-019-0192-6
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发表时间：
2019-08
影响因子：
5.9
通讯作者：
Ryo Nishimura;Kengo Hyodo;H. Mayama;S. Yokojima;Shinichiro Nakamura;K. Uchida
中科院分区：
文献类型：
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作者：
Ryo Nishimura;Kengo Hyodo;H. Mayama;S. Yokojima;Shinichiro Nakamura;K. Uchida
白蚁的翅膀有一个特殊的性质，润湿接触水滴：它吸收水雾，而较大的水滴在表面反弹。这是由于白蚁的生存策略。在这里，我们重现白蚁翅膀的双重润湿性的光诱导晶体生长技术。在UV照射到两种二芳基乙烯的混合物的微晶表面时，观察到两种类型的明显不同尺寸的针状晶体生长。表面表现出类似于白蚁翅膀的双重润湿性的行为。水滴的弹跳能力归因于较小尺寸的针状晶体，而粘附性归因于较大尺寸的针状晶体，这解释了白蚁翅膀的微观结构。考虑耗散能和粘附能，可以从理论上解释弹性体的弹跳能力和双重润湿性。该表面可能用于集水应用。
The termite wing has a specific property of wetting in contact with a water droplet: it adsorbs water mist, whereas larger water droplets are bounced on the surface. This is owing to the survival strategy of termites. Here, we reproduce the termite wing’s dual wettability by a photoinduced crystal growth technique. Upon UV irradiation to a microcrystalline surface of a mixture of two diarylethenes, two types of needle-shaped crystals of distinctly different sizes are observed to grow. The surface shows behavior akin to the termite wing’s dual wettability. The bouncing ability of a water droplet is attributed to the smaller-sized needle crystals, whereas the adhesive property is owing to the larger-sized ones, explaining the microstructures of the termite wing. Considering dissipation energy and adhesion energy, the bouncing ability and dual wettability can be explained theoretically. The surface could potentially be used in water harvesting applications.