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Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors

Recently, flexible sensors based on conductive hydrogels have been widely used in human health monitoring, human movement detection and soft robotics due to their excellent flexibility, high water content, good biocompatibility. However, traditional conductive hydrogels tend to freeze and lose their...

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Autores principales: Dai, Bailin, Cui, Ting, Xu, Yue, Wu, Shaoji, Li, Youwei, Wang, Wu, Liu, Sihua, Tang, Jianxin, Tang, Li
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9223130/
https://www.ncbi.nlm.nih.gov/pubmed/35735718
http://dx.doi.org/10.3390/gels8060374
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author Dai, Bailin
Cui, Ting
Xu, Yue
Wu, Shaoji
Li, Youwei
Wang, Wu
Liu, Sihua
Tang, Jianxin
Tang, Li
author_facet Dai, Bailin
Cui, Ting
Xu, Yue
Wu, Shaoji
Li, Youwei
Wang, Wu
Liu, Sihua
Tang, Jianxin
Tang, Li
author_sort Dai, Bailin
collection PubMed
description Recently, flexible sensors based on conductive hydrogels have been widely used in human health monitoring, human movement detection and soft robotics due to their excellent flexibility, high water content, good biocompatibility. However, traditional conductive hydrogels tend to freeze and lose their flexibility at low temperature, which greatly limits their application in a low temperature environment. Herein, according to the mechanism that multi−hydrogen bonds can inhibit ice crystal formation by forming hydrogen bonds with water molecules, we used butanediol (BD) and N−hydroxyethyl acrylamide (HEAA) monomer with a multi−hydrogen bond structure to construct LiCl/p(HEAA−co−BD) conductive hydrogel with antifreeze property. The results indicated that the prepared LiCl/p(HEAA−co−BD) conductive hydrogel showed excellent antifreeze property with a low freeze point of −85.6 °C. Therefore, even at −40 °C, the hydrogel can still stretch up to 400% with a tensile stress of ~450 KPa. Moreover, the hydrogel exhibited repeatable adhesion property (~30 KPa), which was attributed to the existence of multiple hydrogen bonds. Furthermore, a simple flexible sensor was fabricated by using LiCl/p(HEAA−co−BD) conductive hydrogel to detect compression and stretching responses. The sensor had excellent sensitivity and could monitor human body movement.
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spelling pubmed-92231302022-06-24 Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors Dai, Bailin Cui, Ting Xu, Yue Wu, Shaoji Li, Youwei Wang, Wu Liu, Sihua Tang, Jianxin Tang, Li Gels Article Recently, flexible sensors based on conductive hydrogels have been widely used in human health monitoring, human movement detection and soft robotics due to their excellent flexibility, high water content, good biocompatibility. However, traditional conductive hydrogels tend to freeze and lose their flexibility at low temperature, which greatly limits their application in a low temperature environment. Herein, according to the mechanism that multi−hydrogen bonds can inhibit ice crystal formation by forming hydrogen bonds with water molecules, we used butanediol (BD) and N−hydroxyethyl acrylamide (HEAA) monomer with a multi−hydrogen bond structure to construct LiCl/p(HEAA−co−BD) conductive hydrogel with antifreeze property. The results indicated that the prepared LiCl/p(HEAA−co−BD) conductive hydrogel showed excellent antifreeze property with a low freeze point of −85.6 °C. Therefore, even at −40 °C, the hydrogel can still stretch up to 400% with a tensile stress of ~450 KPa. Moreover, the hydrogel exhibited repeatable adhesion property (~30 KPa), which was attributed to the existence of multiple hydrogen bonds. Furthermore, a simple flexible sensor was fabricated by using LiCl/p(HEAA−co−BD) conductive hydrogel to detect compression and stretching responses. The sensor had excellent sensitivity and could monitor human body movement. MDPI 2022-06-13 /pmc/articles/PMC9223130/ /pubmed/35735718 http://dx.doi.org/10.3390/gels8060374 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dai, Bailin
Cui, Ting
Xu, Yue
Wu, Shaoji
Li, Youwei
Wang, Wu
Liu, Sihua
Tang, Jianxin
Tang, Li
Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors
title Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors
title_full Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors
title_fullStr Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors
title_full_unstemmed Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors
title_short Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors
title_sort smart antifreeze hydrogels with abundant hydrogen bonding for conductive flexible sensors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9223130/
https://www.ncbi.nlm.nih.gov/pubmed/35735718
http://dx.doi.org/10.3390/gels8060374
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