Metamaterial adhesives for programmable adhesion through reverse crack propagation
Metamaterial adhesives for programmable adhesion through reverse crack propagation
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DOI：
10.1038/s41563-023-01577-2
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发表时间：
2023-06
期刊：
影响因子：
41.2
通讯作者：
Dohgyu Hwang;Chanhong Lee;Xingwei Yang;J. M. Pérez-González;Jason Finnegan;Bernard Lee;Eric J. Markvicka;Rong Long;Michael D. Bartlett
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文献类型：
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作者：
Dohgyu Hwang;Chanhong Lee;Xingwei Yang;J. M. Pérez-González;Jason Finnegan;Bernard Lee;Eric J. Markvicka;Rong Long;Michael D. Bartlett
胶粘剂通常是强的和永久的或可逆的有限的强度。然而，目前制造可穿戴设备、机器人和材料拆卸所需的强而可逆粘合剂的策略缺乏对强度和释放的独立控制，需要复杂的制造或仅在特定条件下工作。在这里，我们报告了超材料粘合剂，同时实现强大的和可释放的粘附与空间可选择的粘附强度通过编程切割架构。非线性切割独特地抑制裂纹扩展，迫使裂纹向后扩展，以提高60倍的附着力，同时允许裂纹向相反方向扩展，以方便释放和重复使用。该机制适用于湿和干条件下不同基材上的许多粘合剂，并在任何位置以两个方向同时独立可编程的粘附强度实现高度可调的粘附。我们在无掩模的数字制造框架中创建这些多功能材料，以快速定制粘合剂特性，并对下一代粘合剂进行确定性控制。
Adhesives are typically either strong and permanent or reversible with limited strength. However, current strategies to create strong yet reversible adhesives needed for wearable devices, robotics and material disassembly lack independent control of strength and release, require complex fabrication or only work in specific conditions. Here we report metamaterial adhesives that simultaneously achieve strong and releasable adhesion with spatially selectable adhesion strength through programmed cut architectures. Nonlinear cuts uniquely suppress crack propagation by forcing cracks to propagate backwards for 60× enhancement in adhesion, while allowing crack growth in the opposite direction for easy release and reusability. This mechanism functions in numerous adhesives on diverse substrates in wet and dry conditions and enables highly tunable adhesion with independently programmable adhesion strength in two directions simultaneously at any location. We create these multifunctional materials in a maskless, digital fabrication framework to rapidly customize adhesive characteristics with deterministic control for next-generation adhesives.