Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State

Abstract The difficulty of measuring very large contact angles (>150 degrees) has become more relevant with the increased popularity of super-repellent surfaces. Measurement is more difficult for dynamic contact angles, for which theoretical profiles do not fit well, and small capillary length li...

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Autores principales:	Tingyi “Leo” Liu, Chang-Jin “CJ” Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4fe2eaec72cc4229b22ece9efc8f86c9
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spelling	oai:doaj.org-article:4fe2eaec72cc4229b22ece9efc8f86c92021-12-02T11:53:00ZContact Angle Measurement of Small Capillary Length Liquid in Super-repelled State10.1038/s41598-017-00607-92045-2322https://doaj.org/article/4fe2eaec72cc4229b22ece9efc8f86c92017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00607-9https://doaj.org/toc/2045-2322Abstract The difficulty of measuring very large contact angles (>150 degrees) has become more relevant with the increased popularity of super-repellent surfaces. Measurement is more difficult for dynamic contact angles, for which theoretical profiles do not fit well, and small capillary length liquids, whose sessile droplets sag by gravity. Here, we expand the issue to the limit by investigating dynamic contact angles of liquids with an extremely small capillary length (<1.0 mm), empowered by the superomniphobic surface that can super-repel even fluorinated solvents, which highly wet all materials. Numerically simulating and experimentally testing 13 different liquids on the superomniphobic surface, we discover their dynamic contact angles can be measured with a consistent accuracy despite their vastly different capillary lengths if one keeps the lens magnification inversely proportional to the capillary length. Verifying the droplet equator height is a key parameter, we propose a new Bond number defined by the equator height and optical resolution to represent the measurement accuracy of large contact angles. Despite negligible improvement for most liquids today, the proposed approach teaches how to measure very large contact angles with consistent accuracy when any of the liquids in consideration has a capillary length below 1.0 mm.Tingyi “Leo” LiuChang-Jin “CJ” KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tingyi “Leo” Liu Chang-Jin “CJ” Kim Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
description	Abstract The difficulty of measuring very large contact angles (>150 degrees) has become more relevant with the increased popularity of super-repellent surfaces. Measurement is more difficult for dynamic contact angles, for which theoretical profiles do not fit well, and small capillary length liquids, whose sessile droplets sag by gravity. Here, we expand the issue to the limit by investigating dynamic contact angles of liquids with an extremely small capillary length (<1.0 mm), empowered by the superomniphobic surface that can super-repel even fluorinated solvents, which highly wet all materials. Numerically simulating and experimentally testing 13 different liquids on the superomniphobic surface, we discover their dynamic contact angles can be measured with a consistent accuracy despite their vastly different capillary lengths if one keeps the lens magnification inversely proportional to the capillary length. Verifying the droplet equator height is a key parameter, we propose a new Bond number defined by the equator height and optical resolution to represent the measurement accuracy of large contact angles. Despite negligible improvement for most liquids today, the proposed approach teaches how to measure very large contact angles with consistent accuracy when any of the liquids in consideration has a capillary length below 1.0 mm.
format	article
author	Tingyi “Leo” Liu Chang-Jin “CJ” Kim
author_facet	Tingyi “Leo” Liu Chang-Jin “CJ” Kim
author_sort	Tingyi “Leo” Liu
title	Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
title_short	Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
title_full	Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
title_fullStr	Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
title_full_unstemmed	Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
title_sort	contact angle measurement of small capillary length liquid in super-repelled state
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4fe2eaec72cc4229b22ece9efc8f86c9
work_keys_str_mv	AT tingyileoliu contactanglemeasurementofsmallcapillarylengthliquidinsuperrepelledstate AT changjincjkim contactanglemeasurementofsmallcapillarylengthliquidinsuperrepelledstate
_version_	1718394921646292992

Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State

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