Super Water-Repellent Fractal Surfaces of a Photochromic Diarylethene Induced by UV Light

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概要

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• Photochromic diarylethene forms super water-repellent surfaces upon irradiation with UV light. Microfibril-like crystals grow on the solid diarylethene surface after UV irradiation, and the contact angle of water on the surface becomes larger with increasing surface roughness with time. The fractal analysis was made by the box-counting method for the rough surfaces. There are three regions in the roughness size having the fractal dimension of ca. 2.4 (size of roughness smaller than 5 μm), of ca. 2.2 (size of roughness between 5–40 μm), and of ca. 2.0 (size of roughness larger than 40 μm). The fractal dimension of ca. 2.4 was due to the fibril-like structures generated gradually by UV irradiation on diarylethene surfaces accompanied with an increase in the contact angle. The surface structure with larger fractal dimension mainly contributes to realizing the super water-repellency of the diarylethene surfaces. This mechanism of spontaneous formation of fractal surfaces is similar to that for triglyceride and alkylketene dimer waxes.

• 2008-09-25

著者

• Uchida Kingo

  Department Of Materials Chemistry Faculty Of Science And Technology Ryukoku University

• Mayama Hiroyuki

  Nanotechnology Research Center Research Institute For Electronic Science Hokkaido University

• Yokojima Satoshi

  Mitsubishi Chemical Group Science And Technology Research Center Inc.

• TAKATA Atsushi

  Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University

• Tsujii Kaoru

  Nanotechnology Research Center Research Institute For Electronic Science Hokkaido University

• Nakamura Shinichiro

  Mitsubishi Chemical Group Sci. And Technol. Res. Center Inc.

• Yokojima Satoshi

  Mitsubishi Chemical Group Science and Technology Research Center, Inc., 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan

• Izumi Norikazu

  Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520-2194, Japan

• Minami Takayuki

  Nanotechnology Research Center, Research Institute for Electronic Sciences, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan

• Mayama Hiroyuki

  Nanotechnology Research Center, Research Institute for Electronic Sciences, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan

• Takata Atsushi

  Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520-2194, Japan

• Uchida Kingo

  Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520-2194, Japan

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