Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction
Understanding wettability and mechanisms of wetting transition are important for design and engineering of superhydrophobic surfaces. There have been numerous studies on the design and fabrication of superhydrophobic and omniphobic surfaces and on the wetting transition mechanisms triggered by liqui...
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| Format: | Article |
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Nature Publishing Group
2019
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| Online Access: | http://hdl.handle.net/1721.1/120937 https://orcid.org/0000-0002-3548-6173 https://orcid.org/0000-0002-7372-3512 https://orcid.org/0000-0003-2609-4204 |
| _version_ | 1811075008988971008 |
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| author | Annavarapu, Rama Kishore Sojoudi, Hossein Kim, Sanha Hart, Anastasios John Wang, Minghui |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Annavarapu, Rama Kishore Sojoudi, Hossein Kim, Sanha Hart, Anastasios John Wang, Minghui |
| author_sort | Annavarapu, Rama Kishore |
| collection | MIT |
| description | Understanding wettability and mechanisms of wetting transition are important for design and engineering of superhydrophobic surfaces. There have been numerous studies on the design and fabrication of superhydrophobic and omniphobic surfaces and on the wetting transition mechanisms triggered by liquid evaporation. However, there is a lack of a universal method to examine wetting transition on rough surfaces. Here, we introduce force zones across the droplet base and use a local force balance model to explain wetting transition on engineered nanoporous microstructures, utilizing a critical force per unit length (FPL) value. For the first time, we provide a universal scale using the concept of the critical FPL value which enables comparison of various superhydrophobic surfaces in terms of preventing wetting transition during liquid evaporation. In addition, we establish the concept of contact line-fraction theoretically and experimentally by relating it to area-fraction, which clarifies various arguments about the validity of the Cassie-Baxter equation. We use the contact line-fraction model to explain the droplet contact angles, liquid evaporation modes, and depinning mechanism during liquid evaporation. Finally, we develop a model relating a droplet curvature to conventional beam deflection, providing a framework for engineering pressure stable superhydrophobic surfaces. |
| first_indexed | 2024-09-23T09:58:54Z |
| format | Article |
| id | mit-1721.1/120937 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:58:54Z |
| publishDate | 2019 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1209372022-09-26T14:59:08Z Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction Annavarapu, Rama Kishore Sojoudi, Hossein Kim, Sanha Hart, Anastasios John Wang, Minghui Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Kim, Sanha Hart, Anastasios John Wang, Minghui Understanding wettability and mechanisms of wetting transition are important for design and engineering of superhydrophobic surfaces. There have been numerous studies on the design and fabrication of superhydrophobic and omniphobic surfaces and on the wetting transition mechanisms triggered by liquid evaporation. However, there is a lack of a universal method to examine wetting transition on rough surfaces. Here, we introduce force zones across the droplet base and use a local force balance model to explain wetting transition on engineered nanoporous microstructures, utilizing a critical force per unit length (FPL) value. For the first time, we provide a universal scale using the concept of the critical FPL value which enables comparison of various superhydrophobic surfaces in terms of preventing wetting transition during liquid evaporation. In addition, we establish the concept of contact line-fraction theoretically and experimentally by relating it to area-fraction, which clarifies various arguments about the validity of the Cassie-Baxter equation. We use the contact line-fraction model to explain the droplet contact angles, liquid evaporation modes, and depinning mechanism during liquid evaporation. Finally, we develop a model relating a droplet curvature to conventional beam deflection, providing a framework for engineering pressure stable superhydrophobic surfaces. 2019-03-12T19:38:35Z 2019-03-12T19:38:35Z 2019-01 2018-05 2019-02-15T15:50:28Z Article http://purl.org/eprint/type/JournalArticle 2045-2322 http://hdl.handle.net/1721.1/120937 Annavarapu, Rama Kishore, Sanha Kim, Minghui Wang, A. John Hart, and Hossein Sojoudi. “Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction.” Scientific Reports 9, no. 1 (January 23, 2019). © 2019 The Authors https://orcid.org/0000-0002-3548-6173 https://orcid.org/0000-0002-7372-3512 https://orcid.org/0000-0003-2609-4204 http://dx.doi.org/10.1038/s41598-018-37093-6 Scientific Reports Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Scientific Reports |
| spellingShingle | Annavarapu, Rama Kishore Sojoudi, Hossein Kim, Sanha Hart, Anastasios John Wang, Minghui Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction |
| title | Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction |
| title_full | Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction |
| title_fullStr | Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction |
| title_full_unstemmed | Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction |
| title_short | Explaining Evaporation-Triggered Wetting Transition Using Local Force Balance Model and Contact Line-Fraction |
| title_sort | explaining evaporation triggered wetting transition using local force balance model and contact line fraction |
| url | http://hdl.handle.net/1721.1/120937 https://orcid.org/0000-0002-3548-6173 https://orcid.org/0000-0002-7372-3512 https://orcid.org/0000-0003-2609-4204 |
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