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Signatures of slip in dewetting polymer films

Thin polymer films on hydrophobic substrates are susceptible to rupture and hole formation. This, in turn, initiates a complex dewetting process, which ultimately leads to characteristic droplet patterns. Experimental and theoretical studies suggest that the type of droplet pattern depends on the sp...

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Detalles Bibliográficos
Autores principales: Peschka, Dirk, Haefner, Sabrina, Marquant, Ludovic, Jacobs, Karin, Münch, Andreas, Wagner, Barbara
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6510987/
https://www.ncbi.nlm.nih.gov/pubmed/31004049
http://dx.doi.org/10.1073/pnas.1820487116
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author Peschka, Dirk
Haefner, Sabrina
Marquant, Ludovic
Jacobs, Karin
Münch, Andreas
Wagner, Barbara
author_facet Peschka, Dirk
Haefner, Sabrina
Marquant, Ludovic
Jacobs, Karin
Münch, Andreas
Wagner, Barbara
author_sort Peschka, Dirk
collection PubMed
description Thin polymer films on hydrophobic substrates are susceptible to rupture and hole formation. This, in turn, initiates a complex dewetting process, which ultimately leads to characteristic droplet patterns. Experimental and theoretical studies suggest that the type of droplet pattern depends on the specific interfacial condition between the polymer and the substrate. Predicting the morphological evolution over long timescales and on the different length scales involved is a major computational challenge. In this study, a highly adaptive numerical scheme is presented, which allows for following the dewetting process deep into the nonlinear regime of the model equations and captures the complex dynamics, including the shedding of droplets. In addition, our numerical results predict the previously unknown shedding of satellite droplets during the destabilization of liquid ridges that form during the late stages of the dewetting process. While the formation of satellite droplets is well known in the context of elongating fluid filaments and jets, we show here that, for dewetting liquid ridges, this property can be dramatically altered by the interfacial condition between polymer and substrate, namely slip. This work shows how dissipative processes can be used to systematically tune the formation of patterns.
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spelling pubmed-65109872019-05-23 Signatures of slip in dewetting polymer films Peschka, Dirk Haefner, Sabrina Marquant, Ludovic Jacobs, Karin Münch, Andreas Wagner, Barbara Proc Natl Acad Sci U S A PNAS Plus Thin polymer films on hydrophobic substrates are susceptible to rupture and hole formation. This, in turn, initiates a complex dewetting process, which ultimately leads to characteristic droplet patterns. Experimental and theoretical studies suggest that the type of droplet pattern depends on the specific interfacial condition between the polymer and the substrate. Predicting the morphological evolution over long timescales and on the different length scales involved is a major computational challenge. In this study, a highly adaptive numerical scheme is presented, which allows for following the dewetting process deep into the nonlinear regime of the model equations and captures the complex dynamics, including the shedding of droplets. In addition, our numerical results predict the previously unknown shedding of satellite droplets during the destabilization of liquid ridges that form during the late stages of the dewetting process. While the formation of satellite droplets is well known in the context of elongating fluid filaments and jets, we show here that, for dewetting liquid ridges, this property can be dramatically altered by the interfacial condition between polymer and substrate, namely slip. This work shows how dissipative processes can be used to systematically tune the formation of patterns. National Academy of Sciences 2019-05-07 2019-04-19 /pmc/articles/PMC6510987/ /pubmed/31004049 http://dx.doi.org/10.1073/pnas.1820487116 Text en Copyright © 2019 the Author(s). Published by PNAS. http://creativecommons.org/licenses/by/4.0/ This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY) (http://creativecommons.org/licenses/by/4.0/) .
spellingShingle PNAS Plus
Peschka, Dirk
Haefner, Sabrina
Marquant, Ludovic
Jacobs, Karin
Münch, Andreas
Wagner, Barbara
Signatures of slip in dewetting polymer films
title Signatures of slip in dewetting polymer films
title_full Signatures of slip in dewetting polymer films
title_fullStr Signatures of slip in dewetting polymer films
title_full_unstemmed Signatures of slip in dewetting polymer films
title_short Signatures of slip in dewetting polymer films
title_sort signatures of slip in dewetting polymer films
topic PNAS Plus
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6510987/
https://www.ncbi.nlm.nih.gov/pubmed/31004049
http://dx.doi.org/10.1073/pnas.1820487116
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