A Spider-Silk-Inspired Wet Adhesive with Supercold Tolerance
A Spider-Silk-Inspired Wet Adhesive with Supercold Tolerance
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DOI：
10.1002/adma.202007301
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发表时间：
2021-03-03
影响因子：
29.4
通讯作者：
Wang, Shutao
中科院分区：
文献类型：
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作者：
Liu, Xi;Shi, Lianxin;Wang, Shutao
在潮湿的条件下，传统的粘合剂往往会由于表面凝结的小水滴而导致界面失效，而蜘蛛丝可以在这样的环境中捕获猎物。本文报道了一种坚固耐用的蜘蛛丝启发湿粘合剂（SA），该粘合剂由芯-鞘纳米结构纤维组成，具有吸湿性的粘合剂纳米鞘（聚乙烯吡咯烷酮）和支撑纳米芯（聚氨酯）。通过宏观和微观尺度的原位观察，揭示了SA的湿粘附是通过核心-鞘纳米结构纤维独特的溶解-湿润-粘附过程实现的。此外，SA在4至-196摄氏度的潮湿和寒冷基材上保持可靠的附着力，甚至耐受飞溅，剧烈震动和液氮（-196摄氏度）的重量载荷，在低温环境中显示出良好的适用性。本研究将为设计功能性湿胶粘剂提供一条创新途径。
Conventional adhesives often encounter interfacial failure in humid conditions due to small droplets of water condensed on surface, but spider silks can capture prey in such environment. Here a robust spider-silk-inspired wet adhesive (SA) composed of core-sheath nanostructured fibers with hygroscopic adhesive nanosheath (poly(vinylpyrrolidone)) and supporting nanocore (polyurethane) is reported. The wet adhesion of the SA is achieved by a unique dissolving-wetting-adhering process of core-sheath nanostructured fibers, revealed by in situ observations at macro- and microscales. Further, the SA maintains reliable adhesion on wet and cold substrates from 4 to -196 degrees C and even tolerates splashing, violent shaking, and weight loading in liquid nitrogen (-196 degrees C), showing promising applicability in cryogenic environments. This study will provide an innovative route to design functional wet adhesives.