Wang Qilin, Liu Zhao, Tang Chen, Sun Huan, Zhu Lin, Liu Zhuangzhuang, Li Ke, Yang Jia, Qin Gang, Sun Gengzhi, Chen Qiang
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing 211816, China.
ACS Appl Mater Interfaces. 2021 Mar 3;13(8):10457-10466. doi: 10.1021/acsami.0c22484. Epub 2021 Feb 22.
The weak adhesion between two hydrogel layers may lead to the delamination of bilayer hydrogels or low force transfer efficiency during deformation. Here, tough interfacial adhesive bilayer hydrogels with rapid shape deformation and recovery were prepared by simple attachment-heating of two gel layers. The bilayer hydrogels, composed of a shape memory gel (S-gel) and an elastic gel (E-gel), exhibited extremely tough interfacial adhesion between two layers (Γ ∼ 2200 J/m). The shape deformation and shape recovery of the bilayer hydrogels, tuned by "heating-stretching" mode and "stretching-heating-stretching" mode, were rapid (<5 s) and no delamination between two gel layers was detected during shape deformation. Based on the fast shape deformation and recovery, the bilayer hydrogels could mimic the flower and hand, and a gel gripper could be fabricated to catch the object in the hot water. This work provides a simple method to prepare tough adhesive bilayer hydrogels with controlled shape deformation.
两个水凝胶层之间的弱粘附力可能会导致双层水凝胶分层，或在变形过程中力传递效率低下。在此，通过简单地将两个凝胶层附着加热，制备了具有快速形状变形和恢复能力的坚韧界面粘附双层水凝胶。由形状记忆凝胶（S凝胶）和弹性凝胶（E凝胶）组成的双层水凝胶，在两层之间表现出极强的界面粘附力（Γ ∼ 2200 J/m）。通过“加热-拉伸”模式和“拉伸-加热-拉伸”模式调节的双层水凝胶的形状变形和形状恢复速度很快（<5 s），并且在形状变形过程中未检测到两个凝胶层之间分层。基于快速的形状变形和恢复，双层水凝胶可以模仿花朵和手，并且可以制造一个凝胶夹爪来在热水中抓取物体。这项工作提供了一种制备具有可控形状变形的坚韧粘附双层水凝胶的简单方法。
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