Volltext-Downloads (blau) und Frontdoor-Views (grau)

Hierarchical macroscopic fibrillar adhesives: in situ study of buckling and adhesion mechanisms on wavy substrates

  • Nature uses hierarchical fibrillar structures to mediate temporary adhesion to arbitrary substrates. Such structures provide high compliance such that the flat fibril tips can be better positioned with respect to asperities of a wavy rough substrate. We investigated the buckling and adhesion of hierarchically structured adhesives in contact with flat smooth, flat rough and wavy rough substrates. A macroscopic model for the structural adhesive was fabricated by molding polydimethylsiloxane into pillars of diameter in the range of 0.3–4.8 mm, with up to three different hierarchy levels. Both flat-ended and mushroom-shaped hierarchical samples buckled at preloads one quarter that of the single level structures. We explain this behavior by a change in the buckling mode; buckling leads to a loss of contact and diminishes adhesion. Our results indicate that hierarchical structures can have a strong influence on the degree of adhesion on both flat and wavy substrates. Strategies are discussed that achieve highly compliant substrates which adhere to rough substrates.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar


Document Type:Article
Author:Christina T. Bauer, Elmar KronerORCiD, Norman A. FleckORCiD, Eduard ArztORCiD
Parent Title (English):Bioinspiration & Biomimetics
First Page:066002
Year of first Publication:2015
Release Date:2022/11/18
Tag:PDMS; adhesion; bioinspired; buckling; gecko; hierarchy; pillar
Impact:02.891 (2015)
Funding Information:SPP 1420 of the German Science Foundation DFG. European Research Council under the European Union’s Seventh Framework Program (FP/2007-2013)/ERC Grant Agreement n. 340929.
Groups:Funktionelle Mikrostrukturen
Open Access:Open Access
Signature:INM 2015/104
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International