Kinetics of Sorption in Hygroscopic Hydrogels
Hygroscopic hydrogels hold significant promise for high-performance atmospheric water harvesting, passive cooling, and thermal management. However, a mechanistic understanding of the sorption kinetics of hygroscopic hydrogels remains elusive, impeding an optimized design and broad adoption. Here, we...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Chemical Society (ACS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/139794 |
| _version_ | 1826194841347817472 |
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| author | Díaz-Marín, Carlos D Zhang, Lenan Lu, Zhengmao Alshrah, Mohammed Grossman, Jeffrey C Wang, Evelyn N |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Díaz-Marín, Carlos D Zhang, Lenan Lu, Zhengmao Alshrah, Mohammed Grossman, Jeffrey C Wang, Evelyn N |
| author_sort | Díaz-Marín, Carlos D |
| collection | MIT |
| description | Hygroscopic hydrogels hold significant promise for high-performance atmospheric water harvesting, passive cooling, and thermal management. However, a mechanistic understanding of the sorption kinetics of hygroscopic hydrogels remains elusive, impeding an optimized design and broad adoption. Here, we develop a generalized two-concentration model (TCM) to describe the sorption kinetics of hygroscopic hydrogels, where vapor transport in hydrogel micropores and liquid transport in polymer nanopores are coupled through the sorption at the interface. We show that the liquid transport due to the chemical potential gradient in the hydrogel plays an important role in the fast kinetics. The high water uptake is attributed to the expansion of hydrogel during liquid transport. Moreover, we identify key design parameters governing the kinetics, including the initial porosity, hydrogel thickness, and shear modulus. This work provides a generic framework of sorption kinetics, which bridges the knowledge gap between the fundamental transport and practical design of hygroscopic hydrogels. |
| first_indexed | 2024-09-23T10:02:39Z |
| format | Article |
| id | mit-1721.1/139794 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:02:39Z |
| publishDate | 2022 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/1397942023-02-07T04:47:56Z Kinetics of Sorption in Hygroscopic Hydrogels Díaz-Marín, Carlos D Zhang, Lenan Lu, Zhengmao Alshrah, Mohammed Grossman, Jeffrey C Wang, Evelyn N Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Materials Science and Engineering Hygroscopic hydrogels hold significant promise for high-performance atmospheric water harvesting, passive cooling, and thermal management. However, a mechanistic understanding of the sorption kinetics of hygroscopic hydrogels remains elusive, impeding an optimized design and broad adoption. Here, we develop a generalized two-concentration model (TCM) to describe the sorption kinetics of hygroscopic hydrogels, where vapor transport in hydrogel micropores and liquid transport in polymer nanopores are coupled through the sorption at the interface. We show that the liquid transport due to the chemical potential gradient in the hydrogel plays an important role in the fast kinetics. The high water uptake is attributed to the expansion of hydrogel during liquid transport. Moreover, we identify key design parameters governing the kinetics, including the initial porosity, hydrogel thickness, and shear modulus. This work provides a generic framework of sorption kinetics, which bridges the knowledge gap between the fundamental transport and practical design of hygroscopic hydrogels. 2022-01-28T20:31:26Z 2022-01-28T20:31:26Z 2022-01-21 2022-01-28T20:21:03Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/139794 Díaz-Marín, Carlos D, Zhang, Lenan, Lu, Zhengmao, Alshrah, Mohammed, Grossman, Jeffrey C et al. 2022. "Kinetics of Sorption in Hygroscopic Hydrogels." Nano Letters. en 10.1021/acs.nanolett.1c04216 Nano Letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Chemical Society (ACS) Other repository |
| spellingShingle | Díaz-Marín, Carlos D Zhang, Lenan Lu, Zhengmao Alshrah, Mohammed Grossman, Jeffrey C Wang, Evelyn N Kinetics of Sorption in Hygroscopic Hydrogels |
| title | Kinetics of Sorption in Hygroscopic Hydrogels |
| title_full | Kinetics of Sorption in Hygroscopic Hydrogels |
| title_fullStr | Kinetics of Sorption in Hygroscopic Hydrogels |
| title_full_unstemmed | Kinetics of Sorption in Hygroscopic Hydrogels |
| title_short | Kinetics of Sorption in Hygroscopic Hydrogels |
| title_sort | kinetics of sorption in hygroscopic hydrogels |
| url | https://hdl.handle.net/1721.1/139794 |
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