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Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels

Understanding the physical principle that governs the stimuli-induced swelling and shrinking kinetics of hydrogels is indispensable for their applications. Here, we show that the shrinking and swelling kinetics of self-healing hydrogels could be intrinsically asymmetric. The structure frustration, f...

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Autores principales: Cui, Kunpeng, Yu, Chengtao, Ye, Ya Nan, Li, Xueyu, Gong, Jian Ping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457170/
https://www.ncbi.nlm.nih.gov/pubmed/36037384
http://dx.doi.org/10.1073/pnas.2207422119
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author Cui, Kunpeng
Yu, Chengtao
Ye, Ya Nan
Li, Xueyu
Gong, Jian Ping
author_facet Cui, Kunpeng
Yu, Chengtao
Ye, Ya Nan
Li, Xueyu
Gong, Jian Ping
author_sort Cui, Kunpeng
collection PubMed
description Understanding the physical principle that governs the stimuli-induced swelling and shrinking kinetics of hydrogels is indispensable for their applications. Here, we show that the shrinking and swelling kinetics of self-healing hydrogels could be intrinsically asymmetric. The structure frustration, formed by the large difference in the heat and solvent diffusions, remarkably slows down the shrinking kinetics. The plateau modulus of viscoelastic gels is found to be a key parameter governing the formation of structure frustration and, in turn, the asymmetric swelling and shrinking kinetics. This work provides fundamental understandings on the temperature-triggered transient structure formation in self-healing hydrogels. Our findings will find broad use in diverse applications of self-healing hydrogels, where cooperative diffusion of water and gel network is involved. Our findings should also give insight into the molecular diffusion in biological systems that possess macromolecular crowding environments similar to self-healing hydrogels.
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spelling pubmed-94571702023-03-01 Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels Cui, Kunpeng Yu, Chengtao Ye, Ya Nan Li, Xueyu Gong, Jian Ping Proc Natl Acad Sci U S A Physical Sciences Understanding the physical principle that governs the stimuli-induced swelling and shrinking kinetics of hydrogels is indispensable for their applications. Here, we show that the shrinking and swelling kinetics of self-healing hydrogels could be intrinsically asymmetric. The structure frustration, formed by the large difference in the heat and solvent diffusions, remarkably slows down the shrinking kinetics. The plateau modulus of viscoelastic gels is found to be a key parameter governing the formation of structure frustration and, in turn, the asymmetric swelling and shrinking kinetics. This work provides fundamental understandings on the temperature-triggered transient structure formation in self-healing hydrogels. Our findings will find broad use in diverse applications of self-healing hydrogels, where cooperative diffusion of water and gel network is involved. Our findings should also give insight into the molecular diffusion in biological systems that possess macromolecular crowding environments similar to self-healing hydrogels. National Academy of Sciences 2022-08-29 2022-09-06 /pmc/articles/PMC9457170/ /pubmed/36037384 http://dx.doi.org/10.1073/pnas.2207422119 Text en Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) .
spellingShingle Physical Sciences
Cui, Kunpeng
Yu, Chengtao
Ye, Ya Nan
Li, Xueyu
Gong, Jian Ping
Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
title Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
title_full Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
title_fullStr Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
title_full_unstemmed Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
title_short Mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
title_sort mechanism of temperature-induced asymmetric swelling and shrinking kinetics in self-healing hydrogels
topic Physical Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457170/
https://www.ncbi.nlm.nih.gov/pubmed/36037384
http://dx.doi.org/10.1073/pnas.2207422119
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