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Rapid and continuous regulating adhesion strength by mechanical micro-vibration.
Nature Communications ( IF 14.7 ) Pub Date : 2020-03-27 , DOI: 10.1038/s41467-020-15447-x
Langquan Shui 1 , Laibing Jia 2, 3 , Hangbo Li 3 , Jiaojiao Guo 4 , Ziyu Guo 4 , Yilun Liu 5 , Ze Liu 1 , Xi Chen 6, 7
Affiliation  

Controlled tuning of interface adhesion is crucial to a broad range of applications, such as space technology, micro-fabrication, flexible electronics, robotics, and bio-integrated devices. Here, we show a robust and predictable method to continuously regulate interface adhesion by exciting the mechanical micro-vibration in the adhesive system perpendicular to the contact plane. An analytic model reveals the underlying mechanism of adhesion hysteresis and dynamic instability. For a typical PDMS-glass adhesion system, the apparent adhesion strength can be enhanced by 77 times or weakened to 0. Notably, the resulting adhesion switching timescale is comparable to that of geckos (15 ms), and such rapid adhesion switching can be repeated for more than 2 × 107 vibration cycles without any noticeable degradation in the adhesion performance. Our method is independent of surface microstructures and does not require a preload, representing a simple and practical way to design and control surface adhesion in relevant applications.



中文翻译:

通过机械微振动快速连续调节粘合强度。

界面粘附力的受控调节对于空间技术、微制造、柔性电子、机器人和生物集成设备等广泛应用至关重要。在这里,我们展示了一种稳健且可预测的方法,通过激发垂直于接触平面的粘合剂系统中的机械微振动来连续调节界面粘合力。分析模型揭示了粘附滞后和动态不稳定性的潜在机制。对于典型的PDMS-玻璃粘附系统,表观粘附强度可增强77倍或减弱至0。值得注意的是,所产生的粘附切换时间尺度与壁虎的时间尺度(15毫秒)相当,并且这种快速粘附切换可以重复超过 2 × 10 7 个振动周期,粘合性能没有任何明显下降。我们的方法独立于表面微观结构,不需要预紧力,代表了在相关应用中设计和控制表面粘附力的简单实用的方法。

更新日期:2020-04-24
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