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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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Autores principales: Norikane, Yasuo, Hayashino, Masaru, Ohnuma, Mio, Abe, Koji, Kikkawa, Yoshihiro, Saito, Koichiro, Manabe, Kengo, Miyake, Koji, Nakano, Miki, Takada, Naoki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8374144/
https://www.ncbi.nlm.nih.gov/pubmed/34422758
http://dx.doi.org/10.3389/fchem.2021.684767
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author Norikane, Yasuo
Hayashino, Masaru
Ohnuma, Mio
Abe, Koji
Kikkawa, Yoshihiro
Saito, Koichiro
Manabe, Kengo
Miyake, Koji
Nakano, Miki
Takada, Naoki
author_facet Norikane, Yasuo
Hayashino, Masaru
Ohnuma, Mio
Abe, Koji
Kikkawa, Yoshihiro
Saito, Koichiro
Manabe, Kengo
Miyake, Koji
Nakano, Miki
Takada, Naoki
author_sort Norikane, Yasuo
collection PubMed
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.
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spelling pubmed-83741442021-08-20 Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces Norikane, Yasuo Hayashino, Masaru Ohnuma, Mio Abe, Koji Kikkawa, Yoshihiro Saito, Koichiro Manabe, Kengo Miyake, Koji Nakano, Miki Takada, Naoki Front Chem Chemistry 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. Frontiers Media S.A. 2021-08-05 /pmc/articles/PMC8374144/ /pubmed/34422758 http://dx.doi.org/10.3389/fchem.2021.684767 Text en Copyright © 2021 Norikane, Hayashino, Ohnuma, Abe, Kikkawa, Saito, Manabe, Miyake, Nakano and Takada. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Norikane, Yasuo
Hayashino, Masaru
Ohnuma, Mio
Abe, Koji
Kikkawa, Yoshihiro
Saito, Koichiro
Manabe, Kengo
Miyake, Koji
Nakano, Miki
Takada, Naoki
Effect of Surface Properties on the Photo-Induced Crawling Motion of Azobenzene Crystals on Glass Surfaces
title 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_short 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
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8374144/
https://www.ncbi.nlm.nih.gov/pubmed/34422758
http://dx.doi.org/10.3389/fchem.2021.684767
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