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Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids
We present a surface-engineering approach that turns all liquids highly wetting, including ultra-high surface tension fluids such as mercury. Previously, highly wetting behavior was only possible for intrinsically wetting liquid/material combinations through surface roughening to enable the so-calle...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8794827/ https://www.ncbi.nlm.nih.gov/pubmed/35064079 http://dx.doi.org/10.1073/pnas.2109052119 |
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author | Wilke, Kyle L. Lu, Zhengmao Song, Youngsup Wang, Evelyn N. |
author_facet | Wilke, Kyle L. Lu, Zhengmao Song, Youngsup Wang, Evelyn N. |
author_sort | Wilke, Kyle L. |
collection | PubMed |
description | We present a surface-engineering approach that turns all liquids highly wetting, including ultra-high surface tension fluids such as mercury. Previously, highly wetting behavior was only possible for intrinsically wetting liquid/material combinations through surface roughening to enable the so-called Wenzel and hemiwicking states, in which liquid fills the surface structures and causes a droplet to exhibit a low contact angle when contacting the surface. Here, we show that roughness made of reentrant structures allows for a metastable hemiwicking state even for nonwetting liquids. Our surface energy model reveals that with liquid filled in the structure, the reentrant feature creates a local energy barrier, which prevents liquid depletion from surface structures regardless of the intrinsic wettability. We experimentally demonstrated this concept with microfabricated reentrant channels. Notably, we show an apparent contact angle as low as 35° for mercury on structured silicon surfaces with fluorinated coatings, on which the intrinsic contact angle of mercury is 143°, turning a highly nonwetting liquid/material combination highly wetting through surface engineering. Our work enables highly wetting behavior for previously inaccessible material/liquid combinations and thus expands the design space for various thermofluidic applications. |
format | Online Article Text |
id | pubmed-8794827 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-87948272022-07-21 Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids Wilke, Kyle L. Lu, Zhengmao Song, Youngsup Wang, Evelyn N. Proc Natl Acad Sci U S A Physical Sciences We present a surface-engineering approach that turns all liquids highly wetting, including ultra-high surface tension fluids such as mercury. Previously, highly wetting behavior was only possible for intrinsically wetting liquid/material combinations through surface roughening to enable the so-called Wenzel and hemiwicking states, in which liquid fills the surface structures and causes a droplet to exhibit a low contact angle when contacting the surface. Here, we show that roughness made of reentrant structures allows for a metastable hemiwicking state even for nonwetting liquids. Our surface energy model reveals that with liquid filled in the structure, the reentrant feature creates a local energy barrier, which prevents liquid depletion from surface structures regardless of the intrinsic wettability. We experimentally demonstrated this concept with microfabricated reentrant channels. Notably, we show an apparent contact angle as low as 35° for mercury on structured silicon surfaces with fluorinated coatings, on which the intrinsic contact angle of mercury is 143°, turning a highly nonwetting liquid/material combination highly wetting through surface engineering. Our work enables highly wetting behavior for previously inaccessible material/liquid combinations and thus expands the design space for various thermofluidic applications. National Academy of Sciences 2022-01-21 2022-01-25 /pmc/articles/PMC8794827/ /pubmed/35064079 http://dx.doi.org/10.1073/pnas.2109052119 Text en Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Physical Sciences Wilke, Kyle L. Lu, Zhengmao Song, Youngsup Wang, Evelyn N. Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
title | Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
title_full | Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
title_fullStr | Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
title_full_unstemmed | Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
title_short | Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
title_sort | turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids |
topic | Physical Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8794827/ https://www.ncbi.nlm.nih.gov/pubmed/35064079 http://dx.doi.org/10.1073/pnas.2109052119 |
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