Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS)
Understanding the wettability of soft surfaces is of key importance for the development of protective and repellent coatings and controlling droplet dynamics when required. There are many factors that affect the wetting and dynamic dewetting behavior of soft surfaces, such as the formation of wettin...
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MDPI AG
2023-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/5/1938 |
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| author | Fadoua Mayoussi Ali Usama Niloofar Nekoonam Ivonne Knauer David Böcherer Bastian E. Rapp Dorothea Helmer |
| author_facet | Fadoua Mayoussi Ali Usama Niloofar Nekoonam Ivonne Knauer David Böcherer Bastian E. Rapp Dorothea Helmer |
| author_sort | Fadoua Mayoussi |
| collection | DOAJ |
| description | Understanding the wettability of soft surfaces is of key importance for the development of protective and repellent coatings and controlling droplet dynamics when required. There are many factors that affect the wetting and dynamic dewetting behavior of soft surfaces, such as the formation of wetting ridges, the adaptive behavior of the surface caused by the interaction of the fluid with the surface, or the presence of free oligomers that are washed out of the soft surface. In this work, we report the fabrication and characterization of three soft polydimethylsiloxane (PDMS) surfaces with elastic moduli ranging from 7 kPa to 56 kPa. The dynamic dewetting behavior of liquids with different surface tensions was studied on these surfaces, and the data show soft and adaptive wetting behavior of the soft PDMS, as well as the presence of free oligomers. Thin layers of Parylene F (PF) were introduced to the surfaces and their influence on the wetting properties was studied. We show that the thin layers of PF prevent adaptive wetting by preventing the diffusion of liquids into the soft PDMS surfaces and by causing the loss of the soft wetting state. The dewetting properties of the soft PDMS are enhanced, leading to low sliding angles of ≤10° for water, ethylene glycol, and diiodomethane. Therefore, the introduction of a thin PF layer can be used to control wetting states and to increase the dewetting behavior of soft PDMS surfaces. |
| first_indexed | 2024-03-11T07:19:30Z |
| format | Article |
| id | doaj.art-4ee92418a4784dfe9dae38b77c75bbe6 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T07:19:30Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4ee92418a4784dfe9dae38b77c75bbe62023-11-17T08:04:59ZengMDPI AGMaterials1996-19442023-02-01165193810.3390/ma16051938Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS)Fadoua Mayoussi0Ali Usama1Niloofar Nekoonam2Ivonne Knauer3David Böcherer4Bastian E. Rapp5Dorothea Helmer6Laboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK) University of Freiburg, 79110 Freiburg im Breisgau, GermanyLaboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK) University of Freiburg, 79110 Freiburg im Breisgau, GermanyLaboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK) University of Freiburg, 79110 Freiburg im Breisgau, GermanyInstitute for Macromolecular Chemistry, University of Freiburg, 79104 Freiburg im Breisgau, GermanyLaboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK) University of Freiburg, 79110 Freiburg im Breisgau, GermanyLaboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK) University of Freiburg, 79110 Freiburg im Breisgau, GermanyLaboratory of Process Technology, NeptunLab, Department of Microsystem Engineering (IMTEK) University of Freiburg, 79110 Freiburg im Breisgau, GermanyUnderstanding the wettability of soft surfaces is of key importance for the development of protective and repellent coatings and controlling droplet dynamics when required. There are many factors that affect the wetting and dynamic dewetting behavior of soft surfaces, such as the formation of wetting ridges, the adaptive behavior of the surface caused by the interaction of the fluid with the surface, or the presence of free oligomers that are washed out of the soft surface. In this work, we report the fabrication and characterization of three soft polydimethylsiloxane (PDMS) surfaces with elastic moduli ranging from 7 kPa to 56 kPa. The dynamic dewetting behavior of liquids with different surface tensions was studied on these surfaces, and the data show soft and adaptive wetting behavior of the soft PDMS, as well as the presence of free oligomers. Thin layers of Parylene F (PF) were introduced to the surfaces and their influence on the wetting properties was studied. We show that the thin layers of PF prevent adaptive wetting by preventing the diffusion of liquids into the soft PDMS surfaces and by causing the loss of the soft wetting state. The dewetting properties of the soft PDMS are enhanced, leading to low sliding angles of ≤10° for water, ethylene glycol, and diiodomethane. Therefore, the introduction of a thin PF layer can be used to control wetting states and to increase the dewetting behavior of soft PDMS surfaces.https://www.mdpi.com/1996-1944/16/5/1938soft wettingpolydimethylsiloxaneadaptive wettingfree oligomersparylene F |
| spellingShingle | Fadoua Mayoussi Ali Usama Niloofar Nekoonam Ivonne Knauer David Böcherer Bastian E. Rapp Dorothea Helmer Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS) Materials soft wetting polydimethylsiloxane adaptive wetting free oligomers parylene F |
| title | Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS) |
| title_full | Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS) |
| title_fullStr | Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS) |
| title_full_unstemmed | Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS) |
| title_short | Influence of Parylene F Coatings on the Wetting Properties of Soft Polydimethylsiloxane (PDMS) |
| title_sort | influence of parylene f coatings on the wetting properties of soft polydimethylsiloxane pdms |
| topic | soft wetting polydimethylsiloxane adaptive wetting free oligomers parylene F |
| url | https://www.mdpi.com/1996-1944/16/5/1938 |
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