Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis

The equilibrium contact angle of a droplet resting on a solid substrate can reveal essential properties of the solid’s surface. However, when the motion of a droplet on a surface shows significant hysteresis, it is generally accepted that the solid’s equilibrium properties cannot be determined. Here...

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Autores principales:	Jin Young Kim, Stefanie Heyden, Dominic Gerber, Nicolas Bain, Eric R. Dufresne, Robert W. Style
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/39148dc5b4b340899f8ee31c191fb213
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id	oai:doaj.org-article:39148dc5b4b340899f8ee31c191fb213
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spelling	oai:doaj.org-article:39148dc5b4b340899f8ee31c191fb2132021-12-02T15:06:45ZMeasuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis10.1103/PhysRevX.11.0310042160-3308https://doaj.org/article/39148dc5b4b340899f8ee31c191fb2132021-07-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031004http://doi.org/10.1103/PhysRevX.11.031004https://doaj.org/toc/2160-3308The equilibrium contact angle of a droplet resting on a solid substrate can reveal essential properties of the solid’s surface. However, when the motion of a droplet on a surface shows significant hysteresis, it is generally accepted that the solid’s equilibrium properties cannot be determined. Here, we describe a method to measure surface tensions of soft solids with strong wetting hysteresis. With independent knowledge of the surface tension of the wetting fluid and the linear-elastic response of the solid, the solid deformations under the contact line and the contact angle of a single droplet together reveal the difference in surface tension of the solid against the liquid and vapor phases If the solid’s elastic properties are unknown, then this surface tension difference can be determined from the change in substrate deformations with contact angle. These results reveal an alternate equilibrium contact angle, equivalent to the classic form of Young-Dupré, but with surface tensions in place of surface energies. We motivate and apply this approach with experiments on gelatin, a common hydrogel.Jin Young KimStefanie HeydenDominic GerberNicolas BainEric R. DufresneRobert W. StyleAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031004 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jin Young Kim Stefanie Heyden Dominic Gerber Nicolas Bain Eric R. Dufresne Robert W. Style Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis
description	The equilibrium contact angle of a droplet resting on a solid substrate can reveal essential properties of the solid’s surface. However, when the motion of a droplet on a surface shows significant hysteresis, it is generally accepted that the solid’s equilibrium properties cannot be determined. Here, we describe a method to measure surface tensions of soft solids with strong wetting hysteresis. With independent knowledge of the surface tension of the wetting fluid and the linear-elastic response of the solid, the solid deformations under the contact line and the contact angle of a single droplet together reveal the difference in surface tension of the solid against the liquid and vapor phases If the solid’s elastic properties are unknown, then this surface tension difference can be determined from the change in substrate deformations with contact angle. These results reveal an alternate equilibrium contact angle, equivalent to the classic form of Young-Dupré, but with surface tensions in place of surface energies. We motivate and apply this approach with experiments on gelatin, a common hydrogel.
format	article
author	Jin Young Kim Stefanie Heyden Dominic Gerber Nicolas Bain Eric R. Dufresne Robert W. Style
author_facet	Jin Young Kim Stefanie Heyden Dominic Gerber Nicolas Bain Eric R. Dufresne Robert W. Style
author_sort	Jin Young Kim
title	Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis
title_short	Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis
title_full	Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis
title_fullStr	Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis
title_full_unstemmed	Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis
title_sort	measuring surface tensions of soft solids with huge contact-angle hysteresis
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/39148dc5b4b340899f8ee31c191fb213
work_keys_str_mv	AT jinyoungkim measuringsurfacetensionsofsoftsolidswithhugecontactanglehysteresis AT stefanieheyden measuringsurfacetensionsofsoftsolidswithhugecontactanglehysteresis AT dominicgerber measuringsurfacetensionsofsoftsolidswithhugecontactanglehysteresis AT nicolasbain measuringsurfacetensionsofsoftsolidswithhugecontactanglehysteresis AT ericrdufresne measuringsurfacetensionsofsoftsolidswithhugecontactanglehysteresis AT robertwstyle measuringsurfacetensionsofsoftsolidswithhugecontactanglehysteresis
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Measuring Surface Tensions of Soft Solids with Huge Contact-Angle Hysteresis

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