Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction
Superhydrophobic surfaces submerged under water appear shiny due to total internal reflection of light from a thin layer of air (plastron) trapped in their surface texture. This entrapped air is advantageous for frictional drag reduction in various applications ranging from microfluidic channels to...
| Main Authors: | , , , |
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| 其他作者: | |
| 格式: | 文件 |
| 语言: | English |
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American Chemical Society (ACS)
2020
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| 在线阅读: | https://hdl.handle.net/1721.1/124202 |
| _version_ | 1826193813167669248 |
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| author | Panchanathan, Divya Rajappan, Anoop Varanasi, Kripa McKinley, Gareth H |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Panchanathan, Divya Rajappan, Anoop Varanasi, Kripa McKinley, Gareth H |
| author_sort | Panchanathan, Divya |
| collection | MIT |
| description | Superhydrophobic surfaces submerged under water appear shiny due to total internal reflection of light from a thin layer of air (plastron) trapped in their surface texture. This entrapped air is advantageous for frictional drag reduction in various applications ranging from microfluidic channels to marine vessels. However, these aerophilic textures are prone to impregnation by water due to turbulent pressure fluctuations from external flows and dissolution of the trapped gas into the water. We demonstrate a novel chemical method to replenish the plastron in situ by using the decomposition reaction of hydrogen peroxide on superhydrophobic surfaces prepared with a catalytic coating. We also provide a thermodynamic framework for designing superhydrophobic surfaces with optimal texture and chemistry for underwater plastron regeneration. We finally demonstrate the practical utility of this method by fabricating periodic microtextures on aluminum surfaces that incorporate a cheap catalyst, manganese dioxide. We perform drag-reduction experiments under turbulent flow conditions in a Taylor-Couette cell (TC cell), which show that more than half of the drag increase ensuing from plastron collapse can be recovered spontaneously by injection of dilute H₂O₂ into the TC cell. Thus, we present a low-cost, scalable method to enable in situ plastron regeneration on large surfaces for marine applications. |
| first_indexed | 2024-09-23T09:45:48Z |
| format | Article |
| id | mit-1721.1/124202 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:45:48Z |
| publishDate | 2020 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/1242022022-09-26T13:33:03Z Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction Panchanathan, Divya Rajappan, Anoop Varanasi, Kripa McKinley, Gareth H Massachusetts Institute of Technology. Department of Mechanical Engineering Superhydrophobic surfaces submerged under water appear shiny due to total internal reflection of light from a thin layer of air (plastron) trapped in their surface texture. This entrapped air is advantageous for frictional drag reduction in various applications ranging from microfluidic channels to marine vessels. However, these aerophilic textures are prone to impregnation by water due to turbulent pressure fluctuations from external flows and dissolution of the trapped gas into the water. We demonstrate a novel chemical method to replenish the plastron in situ by using the decomposition reaction of hydrogen peroxide on superhydrophobic surfaces prepared with a catalytic coating. We also provide a thermodynamic framework for designing superhydrophobic surfaces with optimal texture and chemistry for underwater plastron regeneration. We finally demonstrate the practical utility of this method by fabricating periodic microtextures on aluminum surfaces that incorporate a cheap catalyst, manganese dioxide. We perform drag-reduction experiments under turbulent flow conditions in a Taylor-Couette cell (TC cell), which show that more than half of the drag increase ensuing from plastron collapse can be recovered spontaneously by injection of dilute H₂O₂ into the TC cell. Thus, we present a low-cost, scalable method to enable in situ plastron regeneration on large surfaces for marine applications. 2020-03-23T20:21:39Z 2020-03-23T20:21:39Z 2018-09 2018-07 2020-03-19T13:55:23Z Article http://purl.org/eprint/type/JournalArticle 1944-8244 1944-8252 https://hdl.handle.net/1721.1/124202 Panchanathan, Divya et al. "Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction." ACS Applied Materials & Interfaces 10, 39 (September 2018): 33684-33692 © 2018 American Chemical Society en http://dx.doi.org/10.1021/acsami.8b12471 ACS Applied Materials & Interfaces 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) Gareth McKinley |
| spellingShingle | Panchanathan, Divya Rajappan, Anoop Varanasi, Kripa McKinley, Gareth H Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction |
| title | Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction |
| title_full | Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction |
| title_fullStr | Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction |
| title_full_unstemmed | Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction |
| title_short | Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction |
| title_sort | plastron regeneration on submerged superhydrophobic surfaces using in situ gas generation by chemical reaction |
| url | https://hdl.handle.net/1721.1/124202 |
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