Designing Robust Hierarchically Textured Oleophobic Fabrics
Commercially available woven fabrics (e.g., nylon- or PET-based fabrics) possess inherently re-entrant textures in the form of cylindrical yarns and fibers. We analyze the liquid repellency of woven and nanotextured oleophobic fabrics using a nested model with n levels of hierarchy that is construct...
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| Format: | Article |
| Language: | en_US |
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American Chemical Society (ACS)
2017
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| Online Access: | http://hdl.handle.net/1721.1/109349 https://orcid.org/0000-0002-3873-2472 https://orcid.org/0000-0003-4591-6090 https://orcid.org/0000-0003-1085-7692 https://orcid.org/0000-0001-8323-2779 |
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| author | Truong, Quoc T. Sieber, Michael Kleingartner, Justin Alan Srinivasan, Siddarth Cohen, Robert E McKinley, Gareth H |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Truong, Quoc T. Sieber, Michael Kleingartner, Justin Alan Srinivasan, Siddarth Cohen, Robert E McKinley, Gareth H |
| author_sort | Truong, Quoc T. |
| collection | MIT |
| description | Commercially available woven fabrics (e.g., nylon- or PET-based fabrics) possess inherently re-entrant textures in the form of cylindrical yarns and fibers. We analyze the liquid repellency of woven and nanotextured oleophobic fabrics using a nested model with n levels of hierarchy that is constructed from modular units of cylindrical and spherical building blocks. At each level of hierarchy, the density of the topographical features is captured using a dimensionless textural parameter D[subscript n][superscript *]. For a plain-woven mesh comprised of chemically treated fiber bundles (n = 2), the tight packing of individual fibers in each bundle (D[subscript 2][superscript *] ≈ 1) imposes a geometric constraint on the maximum oleophobicity that can be achieved solely by modifying the surface energy of the coating. For liquid droplets contacting such tightly bundled fabrics with modified surface energies, we show that this model predicts a lower bound on the equilibrium contact angle of θE ≈ 57° below which the Cassie–Baxter to Wenzel wetting transition occurs spontaneously, and this is validated experimentally. We demonstrate how the introduction of an additional higher order micro-/nanotexture onto the fibers (n = 3) is necessary to overcome this limit and create more robustly nonwetting fabrics. Finally, we show a simple experimental realization of the enhanced oleophobicity of fabrics by depositing spherical microbeads of poly(methyl methacrylate)/fluorodecyl polyhedral oligomeric silsesquioxane (fluorodecyl POSS) onto the fibers of a commercial woven nylon fabric. |
| first_indexed | 2024-09-23T17:11:01Z |
| format | Article |
| id | mit-1721.1/109349 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T17:11:01Z |
| publishDate | 2017 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/1093492022-10-03T11:00:46Z Designing Robust Hierarchically Textured Oleophobic Fabrics Truong, Quoc T. Sieber, Michael Kleingartner, Justin Alan Srinivasan, Siddarth Cohen, Robert E McKinley, Gareth H Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Kleingartner, Justin Alan Srinivasan, Siddarth Cohen, Robert E McKinley, Gareth H Commercially available woven fabrics (e.g., nylon- or PET-based fabrics) possess inherently re-entrant textures in the form of cylindrical yarns and fibers. We analyze the liquid repellency of woven and nanotextured oleophobic fabrics using a nested model with n levels of hierarchy that is constructed from modular units of cylindrical and spherical building blocks. At each level of hierarchy, the density of the topographical features is captured using a dimensionless textural parameter D[subscript n][superscript *]. For a plain-woven mesh comprised of chemically treated fiber bundles (n = 2), the tight packing of individual fibers in each bundle (D[subscript 2][superscript *] ≈ 1) imposes a geometric constraint on the maximum oleophobicity that can be achieved solely by modifying the surface energy of the coating. For liquid droplets contacting such tightly bundled fabrics with modified surface energies, we show that this model predicts a lower bound on the equilibrium contact angle of θE ≈ 57° below which the Cassie–Baxter to Wenzel wetting transition occurs spontaneously, and this is validated experimentally. We demonstrate how the introduction of an additional higher order micro-/nanotexture onto the fibers (n = 3) is necessary to overcome this limit and create more robustly nonwetting fabrics. Finally, we show a simple experimental realization of the enhanced oleophobicity of fabrics by depositing spherical microbeads of poly(methyl methacrylate)/fluorodecyl polyhedral oligomeric silsesquioxane (fluorodecyl POSS) onto the fibers of a commercial woven nylon fabric. United States. Army Research Office (W911NF-13-D-0001) 2017-05-25T18:52:23Z 2017-05-25T18:52:23Z 2015-12 2015-08 Article http://purl.org/eprint/type/JournalArticle 0743-7463 1520-5827 http://hdl.handle.net/1721.1/109349 Kleingartner, Justin A.; Srinivasan, Siddarth; Truong, Quoc T.; Sieber, Michael; Cohen, Robert E. and McKinley, Gareth H. “Designing Robust Hierarchically Textured Oleophobic Fabrics.” Langmuir 31, no. 48 (December 2015): 13201–13213 © 2015 American Chemical Society https://orcid.org/0000-0002-3873-2472 https://orcid.org/0000-0003-4591-6090 https://orcid.org/0000-0003-1085-7692 https://orcid.org/0000-0001-8323-2779 en_US http://dx.doi.org/10.1021/acs.langmuir.5b03000 Langmuir Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Chemical Society (ACS) MIT Web Domain |
| spellingShingle | Truong, Quoc T. Sieber, Michael Kleingartner, Justin Alan Srinivasan, Siddarth Cohen, Robert E McKinley, Gareth H Designing Robust Hierarchically Textured Oleophobic Fabrics |
| title | Designing Robust Hierarchically Textured Oleophobic Fabrics |
| title_full | Designing Robust Hierarchically Textured Oleophobic Fabrics |
| title_fullStr | Designing Robust Hierarchically Textured Oleophobic Fabrics |
| title_full_unstemmed | Designing Robust Hierarchically Textured Oleophobic Fabrics |
| title_short | Designing Robust Hierarchically Textured Oleophobic Fabrics |
| title_sort | designing robust hierarchically textured oleophobic fabrics |
| url | http://hdl.handle.net/1721.1/109349 https://orcid.org/0000-0002-3873-2472 https://orcid.org/0000-0003-4591-6090 https://orcid.org/0000-0003-1085-7692 https://orcid.org/0000-0001-8323-2779 |
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