材料科学
导电体
自愈水凝胶
复合数
各向异性
应变计
可穿戴计算机
标度系数
聚乙烯醇
压阻效应
磁场
自愈
拉伤
复合材料
纳米技术
计算机科学
嵌入式系统
制作
物理
内科学
病理
高分子化学
医学
替代医学
量子力学
作者
Xuehui Zhang,Bo Lang,Wenwen Yu,Lan Jia,Fengbo Zhu,Yanru Xue,Xiaogang Wu,Yi‐Xian Qin,Weiyi Chen,Yanqin Wang,Qiang Zheng
标识
DOI:10.1016/j.cej.2023.145832
摘要
In this study, we present the development of wearable electronic devices with integrated sensing and physiotherapy functionalities, aiming to advance flexible multidimensional strain sensors. The as-developed electronic devices are based on a composite hydrogel with unique anisotropic electromechanical properties and exceptional magnetothermal capabilities. Specifically, two-dimensional nanohybrids possessing both conductive and magnetic properties are induced to align orientationally within the polyvinyl alcohol (PVA) network through a magnetic field pre-induction strategy, resulting in the conductive hydrogels with anisotropic structures. The as-optimized composite hydrogel demonstrates distinct conductivities in the parallel and vertical directions, enabling the creation of a multidimensional strain sensor. This sensor is capable of accurately sensing strains in orthogonal directions, with distinguishable gauge factors (GF∥ = 3.20, while GF⊥ = 1.78) within the tensile strain range of 0 ∼ 60%. Additionally, the strain sensor exhibits a relatively fast response time (t∥ = 74.47 ms, t⊥ = 157.63 ms). Moreover, the composite hydrogel exhibits excellent magnetothermal physiotherapy capabilities, making it suitable for therapeutic applications. Furthermore, the conductive hydrogel can be assembled into a 3D distribution array, enabling the detection of both the magnitude and spatial distribution of stress. In summary, the anisotropic conductive hydrogel shows promise as a next-generation, multidimensional flexible strain and stress sensors with rehabilitation assistant functions.
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