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In Situ Observation Reveals Local Detachment Mechanisms and Suction Effects in Micropatterned Adhesives

  • Fibrillar adhesion pads of insects and geckoes have inspired the design of high-performance adhesives enabling a new generation of handling devices. Despite much progress over the last decade, the current understanding of these adhesives is limited to single contact pillars and the behavior of whole arrays is largely unexplored. In the study reported here, a novel approach is taken to gain insight into the detachment mechanisms of whole micropatterned arrays. Individual contacts are imaged by frustrated total internal reflection, allowing in situ observation of contact formation and separation during adhesion tests. The detachment of arrays is found to be governed by the distributed adhesion strength of individual pillars, but no collaborative effect mediated by elastic interactions can be detected. At the maximal force, about 30% of the mushroom structures are already detached. The adhesive forces decrease with reduced air pressure by 20% for the smooth and by 6% for the rough specimen. These contributions are attributed to a suction effect, whose strength depends critically on interfacial defects controlling the sealing quality of the contact. This dominates the detachment process and the resulting adhesion strength.

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Document Type:Article
Author:Verena Tinnemann, Luissé Hernández, Sarah FischerORCiD, Eduard ArztORCiD, Roland BennewitzORCiD, René HenselORCiD
Parent Title (English):Advanced Functional Materials
First Page:1807713
Year of first Publication:2019
Release Date:2022/08/30
Tag:adhesion; bioinspiration; elastic coupling; in-situ observation; micropatterning
Impact:16.836 (2019)
Funding Information:European Research Council (ERC) under the European Union's Seventh Framework Program (FP/2007-2013)/ERC Advanced Grant No. 340929.
Groups:Funktionelle Mikrostrukturen
Interaktive Oberflächen
DDC classes:500 Naturwissenschaften und Mathematik / 530 Physik
Open Access:Open Access
Signature:INM 2019/029
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International