.png){kind=icon}
.png){kind=icon}
Return
Preload-Induced Switchable Adhesion
.png){kind=icon}
PRE
AI
DOI：10.1002/smll.202305091.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Animals with robust attachment abilities commonly exhibit stable attachment and convenient detachment. However, achieving an efficient attachment-detachment function in bioinspired adhesives is challenging owing to the complexity and delay of actuators. In this study, a class of multilayer adhesives (MAs) comprising backing, middle, and bottom layers is proposed to realize rapid switching by only adjusting the preload. At low preload, the MAs maintain intimate contact with the substrate. By contrast, a sufficiently large preload results in significant deformation of the middle layer, causing underside buckling and reducing adhesion. By optimizing the structural parameters of the MAs, a high switching ratio (up to 136x) can be achieved under different preloads. Furthermore, the design of the MAs incorporates a film-terminated structure, which prevents the embedding of dirt particles, simplifies cleaning, and maintains the separation and uprightness of the microstructures. Consequently, the MAs demonstrate practical potential for simple and efficient transportation applications, as they achieve switchable adhesion through their structure, exhibiting a high switching ratio and fast switching. A class of multilayer adhesives (MAs) achieving switchable adhesion by adjusting preloads is proposed to implement gripping-transferring-releasing operation. Intimate contact between the MA and object at low preload makes MA in a high adhesion and capable of gripping process. By contrast, a high preload causes underside buckling of the MA, leading to a decline in adhesion.image
Keywords:
multilayer adhesives
preload-induced adhesion
structural parameters
switchable adhesion
underside buckling