材料科学
执行机构
自愈水凝胶
纳米技术
导电体
可伸缩电子设备
复合材料
工程类
电气工程
高分子化学
数码产品
作者
Changhao Qian,Yueqin Li,Chen Chen,Han Lin,Qingshan Han,Lingke Liu,Zichun Lu
标识
DOI:10.1016/j.cej.2022.140263
摘要
• PANI nanoparticles was introduced into a thermal responsive PNA/PVA hydrogel. • The PNA/PVA/PANI hydrogel can realize NIR-responsive actuating performances. • The hydrogel exhibits piezoresistive strain/pressure sensing in motion monitoring. • The hydrogel actuator achieves simultaneous self-sensing and actuation performance. Intelligent hydrogel materials have significant potential for soft robotic applications due to their sharply and reversibly responding to various external stimuli. However, obtaining a biomimetic hydrogel actuator with integrated self-sensing and self-actuation properties is still a great challenge. Herein, a multifunctional conductive hydrogel is fabricated by incorporating a conductive polymer polyaniline (PANI) into a double network poly( N -isopropylacrylamide-co-acrylamide)/poly(vinyl alcohol) (PNA/PVA) hydrogel. The as-prepared conductive PNA/PVA/PANI hydrogel could span a wide range of mechanical properties and phase transition temperatures by simply tuning polymer composition. When combined the active PNA/PVA/PANI layer with a passive polyacrylamide (PAAM) layer, a bilayer hydrogel actuator exhibits superior actuation ability with high bending speeds by the thermal stimulation. In addition, the introduction of PANI component endows the PNA/PVA/PANI hydrogel with excellent electrical conductivity up to 3.91 ± 0.15 S/m and ultrahigh-efficiency of photothermal conversion. Consequently, the PNA/PVA/PANI hydrogel not only exhibits piezoresistive strain/pressure sensing in motion recognition and physiological signal monitoring, but also displays a variety of precise and remotely driven photo-responsive locomotion such as contraction, bending, light tracking and weightlifting by locally near-infrared (NIR) illumination. Furthermore, this hydrogel can simultaneously detect these actuation states via real-time resistance change, achieving closed-loop monitoring and sensing feedback. The self-sensing actuation performance has been fully demonstrated by remotely controlling a hydrogel octopus’s grasping and object moving activities. The multi-responsiveness and real-time sensory feedback will inspire this material to be applied in novel soft biomimetic actuating materials and systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI