TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Wang, Yue
A1  - Li, Zhengwei
A1  - Elhebeary, Mohamed
A1  - Hensel, René
A1  - Arzt, Eduard
A1  - Saif, M. Taher A.
T1  - Water as a "glue" : Elasticity-enhanced wet attachment of biomimetic microcup structures
JF  - Science Advances
N2  - 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. Under-water soft cups form strong attachment with solid surfaces upon retraction by generating large transient suction.
Y1  - 2022
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-511
SN  - 2375-2548
SS  - 2375-2548
U6  - https://doi.org/10.1126/sciadv.abm9341
DO  - https://doi.org/10.1126/sciadv.abm9341
VL  - 8
IS  - 12
ER  -