Stimulation Modulates Adhesion and Mechanics of Hydrogel Adhesives
Stimulation Modulates Adhesion and Mechanics of Hydrogel Adhesives
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刺激调节水凝胶粘合剂的粘合力和力学
DOI：
10.1021/acs.langmuir.1c00696
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Li, Jianyu
中科院分区：
文献类型：
--
作者：
Yang, Zhen;Yang, Xingwei;Long, Rong;Li, Jianyu
从组织修复到软机器人等广泛应用都需要按需调节软材料粘附力的能力。研究工作一直集中在界面的化学和结构上，而忽视了软粘合剂的力学。智能水凝胶的刺激响应机制可用于实现对外部刺激做出机械响应的刺激响应水凝胶粘合剂。这种刺激响应水凝胶粘合剂涉及复杂的化学机械耦合和界面断裂现象，需要对机理的理解以实现合理的设计。在这里，我们结合实验、计算和分析方法来研究热响应水凝胶粘合剂。实验表明，刺激响应水凝胶粘合剂的粘附力和机械性能均通过施加刺激而增强。我们的分析进一步表明，粘附力的增强源于本体水凝胶断裂能的增加以及粘附组织界面上微不足道的残余应力。这项研究提出了一个基于体积特性调节的刺激响应水凝胶粘合剂的设计框架，并为开发具有可调力学的智能粘合剂提供了线索。
The ability to modulate the adhesion of soft materials on-demand is desired for broad applications ranging from tissue repair to soft robotics. Research effort has been focused on the chemistry and architecture of interfaces, leaving the mechanics of soft adhesives overlooked. Stimuli-responsive mechanisms of smart hydrogels could be leveraged for achieving stimuli-responsive hydrogel adhesives that respond mechanically to external stimuli. Such stimuli-responsive hydrogel adhesives involve complex chemomechanical coupling and interfacial fracture phenomena, calling for mechanistic understanding to enable rational design. Here, we combine experimental, computational, and analytical approaches to study a thermo-responsive hydrogel adhesive. Experimentally, we show that the adhesion and mechanical properties of a stimuli-responsive hydrogel adhesive are both enhanced by the application of a stimulus. Our analysis further reveals that the enhanced adhesion stems from the increased fracture energy of the bulk hydrogel and the insignificant residual stress on the adhesive–tissue interface. This study presents a framework for designing stimuli-responsive hydrogel adhesives based on the modulation of bulk properties and sheds light on the development of smart adhesives with tunable mechanics.