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Titel: In Situ Observation Reveals Local Detachment Mechanisms and Suction Effects in Micropatterned Adhesives
VerfasserIn: Tinnemann, Verena
Hernández, Luissé
Fischer, Sarah C. L.
Arzt, Eduard
Bennewitz, Roland
Hensel, René
Sprache: Englisch
Titel: Advanced functional materials
Bandnummer: 29
Heft: 14
Startseite: 1
Endseite: 11
Verlag/Plattform: Wiley
Erscheinungsjahr: 2019
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: 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.
DOI der Erstveröffentlichung: 10.1002/adfm.201807713
Link zu diesem Datensatz: hdl:20.500.11880/28146
http://dx.doi.org/10.22028/D291-29334
ISSN: 1616-3028
1616-301X
Datum des Eintrags: 21-Okt-2019
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Materialwissenschaft und Werkstofftechnik
Professur: NT - Prof. Dr. Eduard Arzt
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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