Sessile drops in weightlessness: an ideal playground for challenging Young’s equation

Abstract Sessile drop creation in weightlessness is critical for designing scientific instruments for space applications and for manipulating organic or biological liquids, such as whole human blood or DNA drops. It requires perfect control of injection, spreading, and wetting; however, the simple a...

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Autores principales:	Marc Medale, David Brutin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Biotechnology TP248.13-248.65 Physiology QP1-981
Acceso en línea:	https://doaj.org/article/521943ff83ae440f907d5b807871aa95
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spelling	oai:doaj.org-article:521943ff83ae440f907d5b807871aa952021-12-02T14:53:44ZSessile drops in weightlessness: an ideal playground for challenging Young’s equation10.1038/s41526-021-00153-92373-8065https://doaj.org/article/521943ff83ae440f907d5b807871aa952021-08-01T00:00:00Zhttps://doi.org/10.1038/s41526-021-00153-9https://doaj.org/toc/2373-8065Abstract Sessile drop creation in weightlessness is critical for designing scientific instruments for space applications and for manipulating organic or biological liquids, such as whole human blood or DNA drops. It requires perfect control of injection, spreading, and wetting; however, the simple act of creating a drop on a substrate is more complex than it appears. A new macroscopic model is derived to better understand this related behavior. We find that, for a given set of substrate, liquid, and surrounding gas properties, when the ratio of surface free energies to contact line free energy is on the macroscopic scale, the macroscopic contact angle can vary at static equilibrium over a broad volume range. It can increase or decrease against volume depending on the sign of this ratio up to an asymptotic value. Consequently, our model aims to explore configurations that challenge the faithful representativity of the classical Young’s equation and extends the present understanding of wetting.Marc MedaleDavid BrutinNature PortfolioarticleBiotechnologyTP248.13-248.65PhysiologyQP1-981ENnpj Microgravity, Vol 7, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biotechnology TP248.13-248.65 Physiology QP1-981
spellingShingle	Biotechnology TP248.13-248.65 Physiology QP1-981 Marc Medale David Brutin Sessile drops in weightlessness: an ideal playground for challenging Young’s equation
description	Abstract Sessile drop creation in weightlessness is critical for designing scientific instruments for space applications and for manipulating organic or biological liquids, such as whole human blood or DNA drops. It requires perfect control of injection, spreading, and wetting; however, the simple act of creating a drop on a substrate is more complex than it appears. A new macroscopic model is derived to better understand this related behavior. We find that, for a given set of substrate, liquid, and surrounding gas properties, when the ratio of surface free energies to contact line free energy is on the macroscopic scale, the macroscopic contact angle can vary at static equilibrium over a broad volume range. It can increase or decrease against volume depending on the sign of this ratio up to an asymptotic value. Consequently, our model aims to explore configurations that challenge the faithful representativity of the classical Young’s equation and extends the present understanding of wetting.
format	article
author	Marc Medale David Brutin
author_facet	Marc Medale David Brutin
author_sort	Marc Medale
title	Sessile drops in weightlessness: an ideal playground for challenging Young’s equation
title_short	Sessile drops in weightlessness: an ideal playground for challenging Young’s equation
title_full	Sessile drops in weightlessness: an ideal playground for challenging Young’s equation
title_fullStr	Sessile drops in weightlessness: an ideal playground for challenging Young’s equation
title_full_unstemmed	Sessile drops in weightlessness: an ideal playground for challenging Young’s equation
title_sort	sessile drops in weightlessness: an ideal playground for challenging young’s equation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/521943ff83ae440f907d5b807871aa95
work_keys_str_mv	AT marcmedale sessiledropsinweightlessnessanidealplaygroundforchallengingyoungsequation AT davidbrutin sessiledropsinweightlessnessanidealplaygroundforchallengingyoungsequation
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Sessile drops in weightlessness: an ideal playground for challenging Young’s equation

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