Fractal Surfaces of Molecular Crystals Mimicking Lotus Leaf with Phototunable Double Roughness Structures
2016
Nishimura, Ryo | Hyodo, Kengo | Sawaguchi, Haruna | Yamamoto, Yoshiaki | Nonomura, Yoshimune | Mayama, Hiroyuki | Yokojima, Satoshi | Nakamura, Shinichiro | Uchida, Kingo
Double roughness structure, the origin of the lotus effect of natural lotus leaf, was successfully reproduced on a diarylethene microcrystalline surface. Static superwater-repellency and dynamic water-drop-bouncing were observed on the surface, in the manner of natural lotus leaves. Double roughness structure was essential for water-drop-bouncing. This ability was not observed on a single roughness microcrystalline surface showing the lotus effect of the same diarylethene derivative. The double roughness structure was reversibly controlled by alternating irradiation with UV and visible light.
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