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Bio-inspired highly hydrophobic surface with ecdysis behavior using an organic monolithic resin and titanium dioxide photocatalyst

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Abstract

In order to develop a durable highly hydrophobic surface, a biomimetic design was developed by combining an organic monolithic resin, TiO2 photocatalyst, and polytetrafluoroethylene particles. An accelerated weathering resistance examination revealed that the highly hydrophobic surface maintained a water contact angle exceeding 140° for 6 years. Moreover, high antiwear performance was confirmed by a rubbing test. Since the organic monolithic resin had co-continual structures with interconnected pores, new surface with a microstructure appeared continually by removal of the damaged surface. On the other hand, decomposition of organic compounds by TiO2 photocatalyst enabled self-etching of the damaged top layer of the organic monolithic resin. The flowing water due to rainfall or physical scraping contributed to the removal of the damaged surface. However, the film thickness after surface restoration was approximately constant. In addition, dynamic hydrophobicity could be improved when interconnected pores of the organic monolithic resins were impregnated with perfluorocarbon liquid. Thus, we have addressed essential issues and proposed a new method for designing hydrophobic surfaces with high durability.

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Acknowledgments

The present study was supported in part by the Project to Create Photocatalyst Industry for Recycling-oriented Society of the New Energy and Industrial Technology Development Organization (NEDO) and by JSPS KAKENHI through a Grant-in-Aid for Exploratory Research (Grant Number 23656066). Technical support by Ms. Mio Hayashi, Ms. Hiroko Takei and Taihokohzai Co., Ltd. is gratefully appreciated.

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Author notes

  1. Munetoshi Sakai

    Present address: Science University of Tokyo, Yamaguchi, 1-1-1 Daigaku-Dori, Sanyo-Onoda, Yamaguchi, 756-0884, Japan

Authors and Affiliations

  1. Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-0012, Japan

    Munetoshi Sakai, Tomoya Kato, Toshihiro Isobe, Akira Nakajima & Akira Fujishima

  2. Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan

    Tomoya Kato, Toshihiro Isobe & Akira Nakajima

  3. Emaus Kyoto, 26 Saiin Nishida-cho, Ukyou-ku, Kyoto, 615-0055, Japan

    Norio Ishizuka

  4. Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan

    Munetoshi Sakai & Akira Fujishima

Authors
  1. Munetoshi Sakai
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  2. Tomoya Kato
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  3. Norio Ishizuka
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  4. Toshihiro Isobe
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  5. Akira Nakajima
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  6. Akira Fujishima
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Corresponding authors

Correspondence to Munetoshi Sakai or Akira Nakajima.

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Sakai, M., Kato, T., Ishizuka, N. et al. Bio-inspired highly hydrophobic surface with ecdysis behavior using an organic monolithic resin and titanium dioxide photocatalyst. J Sol-Gel Sci Technol 77, 257–265 (2016). https://doi.org/10.1007/s10971-015-3851-9

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  • DOI: https://doi.org/10.1007/s10971-015-3851-9

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