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Volume 15
Issue 22
10.3390/ma15227903
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Article

Superrepellent Porous Polymer Surfaces by Replication from Wrinkled Polydimethylsiloxane/Parylene F

by
Fadoua Mayoussi
1,
Ali Usama
1,
Kiana Karimi
1,
Niloofar Nekoonam
1,
Andreas Goralczyk
1,
Pang Zhu
1,
Dorothea Helmer
1,2,3,* and
Bastian E. Rapp
1,2,3
1
Laboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK), University of Freiburg, 79110 Freiburg im Breisgau, Germany
2
Freiburg Materials Research Center (FMF), University of Freiburg, 79104 Freiburg im Breisgau, Germany
3
Freiburg Center of Interactive Materials and Bioinspired Technologies (FIT), University of Freiburg, 79110 Freiburg im Breisgau, Germany
*
Author to whom correspondence should be addressed.
Materials 2022, 15(22), 7903; https://doi.org/10.3390/ma15227903
Submission received: 23 October 2022 / Revised: 4 November 2022 / Accepted: 7 November 2022 / Published: 9 November 2022
(This article belongs to the Special Issue Porous Materials and Advanced Manufacturing Technologies)
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Abstract

Superrepellent surfaces, such as micro/nanostructured surfaces, are of key importance in both academia and industry for emerging applications in areas such as self-cleaning, drag reduction, and oil repellence. Engineering these surfaces is achieved through the combination of the required surface topography, such as porosity, with low-surface-energy materials. The surface topography is crucial for achieving high liquid repellence and low roll-off angles. In general, the combination of micro- and nanostructures is most promising in achieving high repellence. In this work, we report the enhancement of wetting properties of porous polymers by replication from wrinkled Parylene F (PF)-coated polydimethylsiloxane (PDMS). Fluorinated polymer foam “Fluoropor” serves as the low-surface-energy polymer. The wrinkled molds are achieved via the deposition of a thin PF layer onto the soft PDMS substrates. Through consecutive supercritical drying, superrepellent surfaces with a high surface porosity and a high water contact angle (CA) of >165° are achieved. The replicated surfaces show low roll-off angles (ROA) <10° for water and <21° for ethylene glycol. Moreover, the introduction of the micro-wrinkles to Fluoropor not only enhances its liquid repellence for water and ethylene glycol but also for liquids with low surface tension, such as n-hexadecane.
Keywords: surface patterning; polydimethylsiloxane; superhydrophobicity; porous materials surface patterning; polydimethylsiloxane; superhydrophobicity; porous materials

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MDPI and ACS Style

Mayoussi, F.; Usama, A.; Karimi, K.; Nekoonam, N.; Goralczyk, A.; Zhu, P.; Helmer, D.; Rapp, B.E. Superrepellent Porous Polymer Surfaces by Replication from Wrinkled Polydimethylsiloxane/Parylene F. Materials 2022, 15, 7903. https://doi.org/10.3390/ma15227903

AMA Style

Mayoussi F, Usama A, Karimi K, Nekoonam N, Goralczyk A, Zhu P, Helmer D, Rapp BE. Superrepellent Porous Polymer Surfaces by Replication from Wrinkled Polydimethylsiloxane/Parylene F. Materials. 2022; 15(22):7903. https://doi.org/10.3390/ma15227903

Chicago/Turabian Style

Mayoussi, Fadoua, Ali Usama, Kiana Karimi, Niloofar Nekoonam, Andreas Goralczyk, Pang Zhu, Dorothea Helmer, and Bastian E. Rapp. 2022. "Superrepellent Porous Polymer Surfaces by Replication from Wrinkled Polydimethylsiloxane/Parylene F" Materials 15, no. 22: 7903. https://doi.org/10.3390/ma15227903

APA Style

Mayoussi, F., Usama, A., Karimi, K., Nekoonam, N., Goralczyk, A., Zhu, P., Helmer, D., & Rapp, B. E. (2022). Superrepellent Porous Polymer Surfaces by Replication from Wrinkled Polydimethylsiloxane/Parylene F. Materials, 15(22), 7903. https://doi.org/10.3390/ma15227903

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