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Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement

Acoustic levitation is well-suited to ‘lab-on-a-drop’ contactless chemical analysis of droplets. Rapid mixing is of fundamental importance in lab-on-a-drop platforms and many other applications involving droplet manipulation. Small droplets, however, have low Reynolds numbers; thus, mixing via turbu...

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Autores principales: Honda, Kota, Fujiwara, Kota, Hasegawa, Koji, Kaneko, Akiko, Abe, Yutaka
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10638323/
https://www.ncbi.nlm.nih.gov/pubmed/37949912
http://dx.doi.org/10.1038/s41598-023-46008-z
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author Honda, Kota
Fujiwara, Kota
Hasegawa, Koji
Kaneko, Akiko
Abe, Yutaka
author_facet Honda, Kota
Fujiwara, Kota
Hasegawa, Koji
Kaneko, Akiko
Abe, Yutaka
author_sort Honda, Kota
collection PubMed
description Acoustic levitation is well-suited to ‘lab-on-a-drop’ contactless chemical analysis of droplets. Rapid mixing is of fundamental importance in lab-on-a-drop platforms and many other applications involving droplet manipulation. Small droplets, however, have low Reynolds numbers; thus, mixing via turbulence is not possible. Inducing surface oscillation is effective in this regard, however, the relationship between internal flow and mixing dynamics of droplets remains unclear. In this study, we conducted a set of simultaneous optical measurements to assess both the flow field and the distribution of fluid components within acoustically levitated droplets. To achieve this, we developed a technique to selectively separate fluorescent particles within each fluid, permitting the measurement of the concentration field based on the data from the discrete particle distribution. This approach revealed a relationship between the mixing process and the internal flow caused by surface oscillation. Thus, the internal flow induced by surface oscillation could enhance droplet mixing. Our findings will be conducive to the application and further development of lab-on-a-drop devices.
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spelling pubmed-106383232023-11-11 Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement Honda, Kota Fujiwara, Kota Hasegawa, Koji Kaneko, Akiko Abe, Yutaka Sci Rep Article Acoustic levitation is well-suited to ‘lab-on-a-drop’ contactless chemical analysis of droplets. Rapid mixing is of fundamental importance in lab-on-a-drop platforms and many other applications involving droplet manipulation. Small droplets, however, have low Reynolds numbers; thus, mixing via turbulence is not possible. Inducing surface oscillation is effective in this regard, however, the relationship between internal flow and mixing dynamics of droplets remains unclear. In this study, we conducted a set of simultaneous optical measurements to assess both the flow field and the distribution of fluid components within acoustically levitated droplets. To achieve this, we developed a technique to selectively separate fluorescent particles within each fluid, permitting the measurement of the concentration field based on the data from the discrete particle distribution. This approach revealed a relationship between the mixing process and the internal flow caused by surface oscillation. Thus, the internal flow induced by surface oscillation could enhance droplet mixing. Our findings will be conducive to the application and further development of lab-on-a-drop devices. Nature Publishing Group UK 2023-11-10 /pmc/articles/PMC10638323/ /pubmed/37949912 http://dx.doi.org/10.1038/s41598-023-46008-z Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Honda, Kota
Fujiwara, Kota
Hasegawa, Koji
Kaneko, Akiko
Abe, Yutaka
Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
title Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
title_full Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
title_fullStr Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
title_full_unstemmed Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
title_short Coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
title_sort coalescence and mixing dynamics of droplets in acoustic levitation by selective colour imaging and measurement
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10638323/
https://www.ncbi.nlm.nih.gov/pubmed/37949912
http://dx.doi.org/10.1038/s41598-023-46008-z
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