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Differential rotation in cholesteric pillars under a temperature gradient

Steady rotation is induced in cholesteric droplets dispersed in a specific liquid solvent under a temperature gradient. In this phenomenon, two rotational modes have been considered: (1) collective rotation of the local director field and (2) rigid-body rotation of the whole droplet structure. Howev...

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Autores principales: Yoshioka, Jun, Araoka, Fumito
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7560747/
https://www.ncbi.nlm.nih.gov/pubmed/33057019
http://dx.doi.org/10.1038/s41598-020-73024-0
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author Yoshioka, Jun
Araoka, Fumito
author_facet Yoshioka, Jun
Araoka, Fumito
author_sort Yoshioka, Jun
collection PubMed
description Steady rotation is induced in cholesteric droplets dispersed in a specific liquid solvent under a temperature gradient. In this phenomenon, two rotational modes have been considered: (1) collective rotation of the local director field and (2) rigid-body rotation of the whole droplet structure. However, here we present another rotational mode induced in a pillar-shaped cholesteric droplet confined between substrates under a temperature gradient, that is, a differential rotation where the angular velocity varies as a function of the radial coordinate in the pillar. A detailed flow field analysis revealed that every pillar under a temperature gradient involves a double convection roll. These results suggested that the differential rotation in the cholesteric pillars was driven by the inhomogeneous material flow induced by a temperature gradient. The present experimental study indicates that the coupling between the flow and the director motion plays a key role in the rotation of the cholesteric droplets under the temperature gradient.
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spelling pubmed-75607472020-10-19 Differential rotation in cholesteric pillars under a temperature gradient Yoshioka, Jun Araoka, Fumito Sci Rep Article Steady rotation is induced in cholesteric droplets dispersed in a specific liquid solvent under a temperature gradient. In this phenomenon, two rotational modes have been considered: (1) collective rotation of the local director field and (2) rigid-body rotation of the whole droplet structure. However, here we present another rotational mode induced in a pillar-shaped cholesteric droplet confined between substrates under a temperature gradient, that is, a differential rotation where the angular velocity varies as a function of the radial coordinate in the pillar. A detailed flow field analysis revealed that every pillar under a temperature gradient involves a double convection roll. These results suggested that the differential rotation in the cholesteric pillars was driven by the inhomogeneous material flow induced by a temperature gradient. The present experimental study indicates that the coupling between the flow and the director motion plays a key role in the rotation of the cholesteric droplets under the temperature gradient. Nature Publishing Group UK 2020-10-14 /pmc/articles/PMC7560747/ /pubmed/33057019 http://dx.doi.org/10.1038/s41598-020-73024-0 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Yoshioka, Jun
Araoka, Fumito
Differential rotation in cholesteric pillars under a temperature gradient
title Differential rotation in cholesteric pillars under a temperature gradient
title_full Differential rotation in cholesteric pillars under a temperature gradient
title_fullStr Differential rotation in cholesteric pillars under a temperature gradient
title_full_unstemmed Differential rotation in cholesteric pillars under a temperature gradient
title_short Differential rotation in cholesteric pillars under a temperature gradient
title_sort differential rotation in cholesteric pillars under a temperature gradient
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7560747/
https://www.ncbi.nlm.nih.gov/pubmed/33057019
http://dx.doi.org/10.1038/s41598-020-73024-0
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