期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 34, 页码 8491-+出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201705427
关键词
diarylethene; fractal surface; lotus effect; photochromism; photosalient effect
资金
- JSPS KAKENHI [JP26107012, JP26400424]
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Photoresponsive crystalline systems mimicking bio-functions are prepared using photochromic diarylethenes. Upon UV irradiation of the diarylethene crystal, the photogenerated closed-ring isomers self-aggregate to form needle-shaped crystals on the surface. The rough surface shows the superhydrophobic lotus effect. In addition, the rose-petal effects of wetting, the anti-reflective moth-eye effect, and a double-roughness structure mimicking the surface of a lotus leaf are observed by controlling the heating procedures, UV irradiation processes, and molecular structural modification. By changing the molecular structure, a superhydrophilic surface mimicking a snail shell can be generated. We also find the crystal of a diarylethene derivative that shows a photosalient effect. The effect is observed partly due to the hollow structure of the crystal. It is demonstrated that a photo-response similar to the response of impatiens plant to stimulation is observed by packing small beads in the hollow. These photoresponsive functions are unique, and they demonstrate a macroscopic response by means of microscopic molecular movement induced by light. In the future, such a molecular assembly system will be a promising candidate for fabricating photoresponsive architectures and soft robots.
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