Please use this identifier to cite or link to this item: doi:10.22028/D291-35991
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Title: Water as a "glue": Elasticity-enhanced wet attachment of biomimetic microcup structures
Author(s): Wang, Yue
Li, Zhengwei
Elhebeary, Mohamed
Hensel, René
Arzt, Eduard
Saif, M. Taher A.
Language: English
Title: Science advances
Volume: 8
Issue: 12
Publisher/Platform: American Association for the Advancement of Science
Year of Publication: 2022
Publikation type: Journal Article
Abstract: Octopus, clingfish, and larva use soft cups to attach to surfaces under water. Recently, various bioinspired cups have been engineered. However, the mechanisms of their attachment and detachment remain elusive. Using a novel microcup, fabricated by two-photon lithography, coupled with in situ pressure sensor and observation cameras, we reveal the detailed nature of its attachment/detachment under water. It involves elasticity-enhanced hydrodynamics generating "self-sealing" and high suction at the cup-substrate interface, converting water into "glue." Detachment is mediated by seal breaking. Three distinct mechanisms of breaking are identified, including elastic buckling of the cup rim. A mathematical model describes the interplay between the attachment/detachment process, geometry, elasto-hydrodynamics, and cup retraction speed. If the speed is too slow, then the octopus cannot attach; if the tide is too gentle for the larva, then water cannot serve as a glue. The concept of "water glue" can innovate underwater transport and manufacturing strategies.
DOI of the first publication: 10.1126/sciadv.abm9341
URL of the first publication:
Link to this record: hdl:20.500.11880/32803
ISSN: 2375-2548
Date of registration: 14-Apr-2022
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Eduard Arzt
Collections:Die Universitätsbibliographie

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