Multifunctional Self-Healing Dual Network Hydrogels Constructed via Host–Guest Interaction and Dynamic Covalent Bond as Wearable Strain Sensors for Monitoring Human and Organ Motions,ACS Applied Materials & Interfaces

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Multifunctional Self-Healing Dual Network Hydrogels Constructed via Host–Guest Interaction and Dynamic Covalent Bond as Wearable Strain Sensors for Monitoring Human and Organ Motions
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-03-16 , DOI: 10.1021/acsami.1c03213
Xiong Liu _{1,

2} , Zhijun Ren _{1,

2} , Fangfei Liu _{1,

2} , Li Zhao _{1,

2} , Qiangjun Ling _{1,

2} , Haibin Gu _{1,

2}

Affiliation

Hydrogel-based flexible strain sensors have shown great potential in body movement tracking, early disease diagnosis, noninvasive treatment, electronic skins, and soft robotics. The good self-healing, biocompatible, sensitive and stretchable properties are the focus of hydrogel-based flexible strain sensors. Dual network (DN) hydrogels are hopeful to fabricate self-healing hydrogels with the above properties. Here, multifunctional DN hydrogels are prepared via a combination of host–guest interaction of β-cyclodextrin and ferrocene with dynamic borate ester bonds of poly(vinyl alcohol) and borax. Carbon nanotubes are used to endow the DN hydrogels with good conductivity. The obtained DN composite hydrogels possess good biocompatibility, stretchability (436%), fracture strength (41.0 KPa), self-healing property (healing efficiency of 95%), and high tensile strain sensitivity (gauge factor of 5.9). The DN composite hydrogels are used as flexible strain sensors to detect different human motions. After cutting, the healed hydrogels also can monitor human motions and have good stability. In addition, the hydrogel sensors may track the respiratory movement of a pig lung in vitro. This work exhibits new ideas and approaches to develop multifunctional self-healing hydrogels for constructing flexible strain sensors.

中文翻译：

通过宿主-来宾相互作用和动态共价键构建的多功能自愈双网络水凝胶，作为可穿戴式应变传感器来监测人体和器官的运动

基于水凝胶的柔性应变传感器在人体运动跟踪，早期疾病诊断，非侵入性治疗，电子皮肤和软机器人方面显示出巨大潜力。良好的自我修复，生物相容性，灵敏性和可拉伸性是基于水凝胶的柔性应变传感器的重点。双重网络（DN）水凝胶有望制造出具有上述特性的自修复水凝胶。在这里，多功能DN水凝胶是通过β-环糊精和二茂铁的主体与客体相互作用与聚乙烯醇和硼砂的动态硼酸酯键的结合而制备的。碳纳米管用于赋予DN水凝胶良好的导电性。所获得的DN复合水凝胶具有良好的生物相容性，可拉伸性（436％），断裂强度（41.0 KPa），自修复性能（修复效率为95％），和高拉伸应变敏感性（测量系数5.9）。DN复合水凝胶用作柔性应变传感器，可检测不同的人体运动。切割后，愈合的水凝胶还可以监测人体运动并具有良好的稳定性。另外，水凝胶传感器可以跟踪猪肺的呼吸运动体外。这项工作展示了开发多功能自修复水凝胶以构建柔性应变传感器的新思路和新方法。

更新日期：2021-03-31

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