Bilayer-type fluorescence hydrogels with intelligent response serve as temperature/pH driven soft actuators
Bilayer-type fluorescence hydrogels with intelligent response serve as temperature/pH driven soft actuators
复制标题
具有智能响应的双层型荧光水凝胶作为温度/pH驱动的软执行器
DOI：
10.1016/j.snb.2017.09.137
复制
发表时间：
2018-02-01
影响因子：
8.4
通讯作者：
Wei, Jie
中科院分区：
文献类型：
--
作者：
Cheng, Yu;Ren, Kai;Wei, Jie
在这项研究中，我们提出了一种荧光双层水凝胶软致动器，快速响应多种环境刺激。两层水凝胶分别含有聚（N-异丙基丙烯酰胺）和聚（甲基丙烯酸2-（二甲氨基）乙酯），这使得它们能够对温度和pH值产生机械响应。此外，两层水凝胶均含有聚（环氧乙烷）二丙烯酸酯，其用作交联剂。由于两层的各向异性溶胀，双层水凝胶结构在不同的温度或pH下表现出快速、可逆和可重复的弯曲运动。此外，将光敏香豆素基单元引入水凝胶网络以增加荧光。由水凝胶双层制成的四臂夹持器展示了响应于温度和pH的快速致动。此外，我们设计了一个电路开关，使用水凝胶双层作为一个“双向报警”，并选择性地打开发光二极管在不同的介质中。这项工作展示了水凝胶双层作为软致动器和离子电路中的电路开关的应用，使其在广泛的领域中具有潜在的应用，包括仿生器件，生物相容性/医疗器件和环境传感器。(C)2017爱思唯尔B. V.保留所有权利。
In this study, we propose a fluorescent bilayer hydrogel soft actuator that responds quickly to multiple environmental stimuli. The two layers of hydrogel contain poly(N-isopropylacrylamide) and poly(2-(dimethylamino) ethyl methacrylate), respectively, which enable their mechanical response to temperature and pH. Additionally, both hydrogel layers contain poly(ethylene oxide) diacrylate, which serves as the crosslinker. Thanks to the anisotropic swelling of two layers, the bilayer hydrogel structure exhibits rapid, reversible, and repeatable bending motion, under varying temperature or pH. In addition, a photo-sensitive coumarin-based unit is introduced into the hydrogel network to add fluorescence. A four arm gripper made of hydrogel bilayers demonstrates rapid actuation in response to both temperature and pH. Furthermore, we design a circuit switch using the hydrogel bilayer to serve as one "bidirectional alarm" and selectively turn on light emitting diodes in different media. This work demonstrates the applications of the hydrogel bilayer as a soft actuator and a circuit switch in ionic circuitry, enabling potential applications in a wide range of fields, including biomimetic devices, biocompatible/medical devices, and environmental sensors. (C) 2017 Elsevier B.V. All rights reserved.