Whispering Gallery‐Mode Microdroplet Tensiometry

Droplets are ideally suited to support high‐Q‐factor whispering gallery modes (WGMs) due to their perfectly smooth surface. WGMs enable extremely precise measurements of the droplet properties such as size and shape. Herein, a simple, fast, and very precise technique to measure interfacial tension (...

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Autores principales:	Gregor Pirnat, Matjaž Humar
Formato:	article
Lenguaje:	EN
Publicado:	Wiley-VCH 2021
Materias:	droplets interfacial tension tensiometry whispering gallery modes Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/8acac03d93bb47fd87e647c7bbbb08cd
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id	oai:doaj.org-article:8acac03d93bb47fd87e647c7bbbb08cd
record_format	dspace
spelling	oai:doaj.org-article:8acac03d93bb47fd87e647c7bbbb08cd2021-11-04T09:00:27ZWhispering Gallery‐Mode Microdroplet Tensiometry2699-929310.1002/adpr.202100129https://doaj.org/article/8acac03d93bb47fd87e647c7bbbb08cd2021-11-01T00:00:00Zhttps://doi.org/10.1002/adpr.202100129https://doaj.org/toc/2699-9293Droplets are ideally suited to support high‐Q‐factor whispering gallery modes (WGMs) due to their perfectly smooth surface. WGMs enable extremely precise measurements of the droplet properties such as size and shape. Herein, a simple, fast, and very precise technique to measure interfacial tension (IFT) between two immiscible liquids based on WGMs is demonstrated. A microdroplet is generated at the end of a glass microcapillary, submerged in a continuous liquid phase, and its size changes are monitored with nanometer precision via WGMs, while simultaneously applying finely tunable pressure through the microcapillary. IFT is determined from the size of the droplet and the pressure in the microcapillary at equilibrium. Droplets as small as 8 μm are used, thus requiring extremely small sample volume. The IFT measurements can be carried out also at nonequilibrium state when either the size of the droplet or the chemical composition of the continuous phase changes in time. Simultaneously, the WGMs enable very precise measurement of the refractive index of either the droplet or the continuous phase.Gregor PirnatMatjaž HumarWiley-VCHarticledropletsinterfacial tensiontensiometrywhispering gallery modesApplied optics. PhotonicsTA1501-1820Optics. LightQC350-467ENAdvanced Photonics Research, Vol 2, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	droplets interfacial tension tensiometry whispering gallery modes Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
spellingShingle	droplets interfacial tension tensiometry whispering gallery modes Applied optics. Photonics TA1501-1820 Optics. Light QC350-467 Gregor Pirnat Matjaž Humar Whispering Gallery‐Mode Microdroplet Tensiometry
description	Droplets are ideally suited to support high‐Q‐factor whispering gallery modes (WGMs) due to their perfectly smooth surface. WGMs enable extremely precise measurements of the droplet properties such as size and shape. Herein, a simple, fast, and very precise technique to measure interfacial tension (IFT) between two immiscible liquids based on WGMs is demonstrated. A microdroplet is generated at the end of a glass microcapillary, submerged in a continuous liquid phase, and its size changes are monitored with nanometer precision via WGMs, while simultaneously applying finely tunable pressure through the microcapillary. IFT is determined from the size of the droplet and the pressure in the microcapillary at equilibrium. Droplets as small as 8 μm are used, thus requiring extremely small sample volume. The IFT measurements can be carried out also at nonequilibrium state when either the size of the droplet or the chemical composition of the continuous phase changes in time. Simultaneously, the WGMs enable very precise measurement of the refractive index of either the droplet or the continuous phase.
format	article
author	Gregor Pirnat Matjaž Humar
author_facet	Gregor Pirnat Matjaž Humar
author_sort	Gregor Pirnat
title	Whispering Gallery‐Mode Microdroplet Tensiometry
title_short	Whispering Gallery‐Mode Microdroplet Tensiometry
title_full	Whispering Gallery‐Mode Microdroplet Tensiometry
title_fullStr	Whispering Gallery‐Mode Microdroplet Tensiometry
title_full_unstemmed	Whispering Gallery‐Mode Microdroplet Tensiometry
title_sort	whispering gallery‐mode microdroplet tensiometry
publisher	Wiley-VCH
publishDate	2021
url	https://doaj.org/article/8acac03d93bb47fd87e647c7bbbb08cd
work_keys_str_mv	AT gregorpirnat whisperinggallerymodemicrodroplettensiometry AT matjazhumar whisperinggallerymodemicrodroplettensiometry
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Whispering Gallery‐Mode Microdroplet Tensiometry

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