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One-pot freezing-thawing preparation of cellulose nanofibrils reinforced polyvinyl alcohol based ionic hydrogel strain sensor for human motion monitoring
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2021-09-22 , DOI: 10.1016/j.carbpol.2021.118697
Jianquan Hu 1 , Yinglong Wu 1 , Qian Yang 1 , Quanwei Zhou 1 , Lanfeng Hui 1 , Zhong Liu 1 , Feng Xu 2 , Dayong Ding 3
Affiliation  

Ionic conductive hydrogels have been widely applied in sensors, energy storage and soft electronics recently. However, most of the polyvinyl alcohol (PVA) based ionic hydrogels are mainly fabricated by soaking the hydrogels in high concentration electrolyte solution which can induce the waste of electrolyte and solvent. Herein, we have designed cellulose nanofibrils (CNF) and ZnSO4 reinforced PVA based hydrogels through a one-pot simple freezing-thawing method at low ZnSO4 concentration without any soaking process. Furthermore, the hydrogel with 0.4% CNF exhibited stress up to 0.79 MPa (242% strain) and high ionic conductivity of 0.32 S m−1 (0.07 M ZnSO4). Moreover, hydrogel sensor displayed high linear gauge factor 1.70 (0–200% strain), excellent stability, durability and reliability. The integrated hydrogel sensor also showed excellent sensor performance for human motion monitoring. This work provides a new prospect for the design of cellulose reinforced conductive hydrogels via a facile method.



中文翻译:

一锅冻融制备纤维素纳米纤维增强聚乙烯醇基离子水凝胶应变传感器用于人体运动监测

近年来,离子导电水凝胶已广泛应用于传感器、储能和软电子等领域。然而,大多数基于聚乙烯醇(PVA)的离子水凝胶主要是通过将水凝胶浸泡在高浓度电解质溶液中制备的,这会导致电解质和溶剂的浪费。在此,我们通过一锅简单冻融法在低 ZnSO 4浓度下设计了纤维素纳米纤维 (CNF) 和 ZnSO 4增强 PVA 基水凝胶,无需任何浸泡过程。此外,具有 0.4% CNF 的水凝胶表现出高达 0.79 MPa(242% 应变)的应力和 0.32 S m -1(0.07 M ZnSO 4)。此外,水凝胶传感器显示出高线性应变系数 1.70(0-200% 应变)、出色的稳定性、耐用性和可靠性。集成的水凝胶传感器还显示出出色的人体运动监测传感器性能。这项工作为通过简便的方法设计纤维素增强导电水凝胶提供了新的前景。

更新日期:2021-09-27
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