Chapter 24
Biomimetic Functions by Microscopic
Molecular Reactions in Macroscopic
Photoresponsive Crystalline System
Kingo Uchida, Ryo Nishimura, Hiroyuki Mayama, Tsuyoshi Tsujioka,
Satoshi Yokojima, and Shinichiro Nakamura
Abstract Photoresponsive crystalline systems by microscopic molecular photoreactions to induce biomimetic functions are prepared using photochromic diarylethenes.
Upon UV irradiation to crystals of open-ring isomer of diarylethene, needle-shaped
crystals are formed on the surface by self-aggregation of the photogenerated closedring isomers. By using the photoinduced crystal growth technique, we prepared both
superhydrophilic and superhydrophobic surfaces. Our technique is then successfully
applied to prepare the double roughness surfaces by mimicking the structure of
natural lotus leaf to show the bouncing ability of water droplet suggesting the importance of this double roughness structure. By a fine control of surface structures,
we also prepared an object transportation system exploiting the bending behavior of
surface-assembled diarylethene crystals. This system can transport polystyrene beads
on a photo-actuated smart surface to a desired area by changing the light incidence
irradiation directions. As further biomimetics, we prepared a hollow crystal showing
photosalient phenomena. After packing small beads in the hollow, the crystal broke
with scattering the included beads resembling the Impatiens.
Keywords Crystal growth technique · Diarylethene · Double roughness surface ·
Object transport system · Photosalient effect · Impatiens
K. Uchida (B) · R. Nishimura
Department of Materials Chemistry, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
e-mail: uchida@rins.ryukoku.ac.jp
H. Mayama
Department of Chemistry, Asahikawa Medical University, 2-1-1-1 Midorigaoka-Higashi,
Asahikawa, Hokkaido 078-8510, Japan
T. Tsujioka
Department of Arts and Sciences, Osaka Kyoiku University, Asahigaoka 4-698-1, Kashiwara,
Osaka 582-8582, Japan
S. Yokojima
School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi,
Hachioji, Tokyo 192-0392, Japan
S. Nakamura
RIKEN Cluster for Science, Technology and Innovation Hub, Nakamura Laboratory,
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
© Springer Nature Singapore Pte Ltd. 2020
H. Miyasaka et al. (eds.), Photosynergetic Responses in Molecules
and Molecular Aggregates, https://doi.org/10.1007/978-981-15-5451-3_24
405
Biomimetic Functions by Microscopic
Molecular Reactions in Macroscopic
Photoresponsive Crystalline System
Kingo Uchida, Ryo Nishimura, Hiroyuki Mayama, Tsuyoshi Tsujioka,
Satoshi Yokojima, and Shinichiro Nakamura
Abstract Photoresponsive crystalline systems by microscopic molecular photoreactions to induce biomimetic functions are prepared using photochromic diarylethenes.
Upon UV irradiation to crystals of open-ring isomer of diarylethene, needle-shaped
crystals are formed on the surface by self-aggregation of the photogenerated closedring isomers. By using the photoinduced crystal growth technique, we prepared both
superhydrophilic and superhydrophobic surfaces. Our technique is then successfully
applied to prepare the double roughness surfaces by mimicking the structure of
natural lotus leaf to show the bouncing ability of water droplet suggesting the importance of this double roughness structure. By a fine control of surface structures,
we also prepared an object transportation system exploiting the bending behavior of
surface-assembled diarylethene crystals. This system can transport polystyrene beads
on a photo-actuated smart surface to a desired area by changing the light incidence
irradiation directions. As further biomimetics, we prepared a hollow crystal showing
photosalient phenomena. After packing small beads in the hollow, the crystal broke
with scattering the included beads resembling the Impatiens.
Keywords Crystal growth technique · Diarylethene · Double roughness surface ·
Object transport system · Photosalient effect · Impatiens
K. Uchida (B) · R. Nishimura
Department of Materials Chemistry, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
e-mail: uchida@rins.ryukoku.ac.jp
H. Mayama
Department of Chemistry, Asahikawa Medical University, 2-1-1-1 Midorigaoka-Higashi,
Asahikawa, Hokkaido 078-8510, Japan
T. Tsujioka
Department of Arts and Sciences, Osaka Kyoiku University, Asahigaoka 4-698-1, Kashiwara,
Osaka 582-8582, Japan
S. Yokojima
School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi,
Hachioji, Tokyo 192-0392, Japan
S. Nakamura
RIKEN Cluster for Science, Technology and Innovation Hub, Nakamura Laboratory,
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
© Springer Nature Singapore Pte Ltd. 2020
H. Miyasaka et al. (eds.), Photosynergetic Responses in Molecules
and Molecular Aggregates, https://doi.org/10.1007/978-981-15-5451-3_24
405