Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces
Photo-induced crawling motion of a crystal of 3,3′-dimethylazobenzene (DMAB) on a glass substrate having different surface properties was studied. When exposed to UV and visible lights simultaneously from different directions, crystals crawl continuously on a glass surface. On a hydrophilic surface,...
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doaj-13136019e36047a3add0690bffbf6b712021-08-05T05:12:59ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462021-08-01910.3389/fchem.2021.684767684767Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass SurfacesYasuo Norikane0Yasuo Norikane1Masaru Hayashino2Masaru Hayashino3Mio Ohnuma4Koji Abe5Yoshihiro Kikkawa6Koichiro Saito7Kengo Manabe8Koji Miyake9Miki Nakano10Naoki Takada11Research Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanDepartment of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Ibaraki, JapanResearch Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanGraduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki, JapanResearch Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanResearch Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanResearch Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanResearch Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanResearch Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanAdvanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanAdvanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanResearch Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, JapanPhoto-induced crawling motion of a crystal of 3,3′-dimethylazobenzene (DMAB) on a glass substrate having different surface properties was studied. When exposed to UV and visible lights simultaneously from different directions, crystals crawl continuously on a glass surface. On a hydrophilic surface, the crystals crawled faster than those on other surfaces but crystals showed spreading while they moved. On hydrophobic surfaces, on the other hand, the crystals showed little shape change and slower crawling motion. The contact angles of the liquid phase of DMAB on surface-modified glass substrates showed positive correlation with the water contact angles. The interaction of melted azobenzene with glass surfaces plays an important role for the crawling motion. We proposed models to explain the asymmetric condition that leads to the directional motion. Specifically by considering the penetration length of UV and visible light sources, it was successfully shown that the depth of light penetration is different at the position of a crystal. This creates a nonequilibrium condition where melting and crystallization are predominant in the same crystal.https://www.frontiersin.org/articles/10.3389/fchem.2021.684767/fullphotochromismcrystalazobenzeneactuationphase transition |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yasuo Norikane Yasuo Norikane Masaru Hayashino Masaru Hayashino Mio Ohnuma Koji Abe Yoshihiro Kikkawa Koichiro Saito Kengo Manabe Koji Miyake Miki Nakano Naoki Takada |
spellingShingle |
Yasuo Norikane Yasuo Norikane Masaru Hayashino Masaru Hayashino Mio Ohnuma Koji Abe Yoshihiro Kikkawa Koichiro Saito Kengo Manabe Koji Miyake Miki Nakano Naoki Takada Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces Frontiers in Chemistry photochromism crystal azobenzene actuation phase transition |
author_facet |
Yasuo Norikane Yasuo Norikane Masaru Hayashino Masaru Hayashino Mio Ohnuma Koji Abe Yoshihiro Kikkawa Koichiro Saito Kengo Manabe Koji Miyake Miki Nakano Naoki Takada |
author_sort |
Yasuo Norikane |
title |
Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces |
title_short |
Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces |
title_full |
Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces |
title_fullStr |
Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces |
title_full_unstemmed |
Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces |
title_sort |
effect of surface properties on the photo-induced crawling motion of azobenzene crystals on glass surfaces |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Chemistry |
issn |
2296-2646 |
publishDate |
2021-08-01 |
description |
Photo-induced crawling motion of a crystal of 3,3′-dimethylazobenzene (DMAB) on a glass substrate having different surface properties was studied. When exposed to UV and visible lights simultaneously from different directions, crystals crawl continuously on a glass surface. On a hydrophilic surface, the crystals crawled faster than those on other surfaces but crystals showed spreading while they moved. On hydrophobic surfaces, on the other hand, the crystals showed little shape change and slower crawling motion. The contact angles of the liquid phase of DMAB on surface-modified glass substrates showed positive correlation with the water contact angles. The interaction of melted azobenzene with glass surfaces plays an important role for the crawling motion. We proposed models to explain the asymmetric condition that leads to the directional motion. Specifically by considering the penetration length of UV and visible light sources, it was successfully shown that the depth of light penetration is different at the position of a crystal. This creates a nonequilibrium condition where melting and crystallization are predominant in the same crystal. |
topic |
photochromism crystal azobenzene actuation phase transition |
url |
https://www.frontiersin.org/articles/10.3389/fchem.2021.684767/full |
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