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  From beetles in nature to the lab : actuating underwater locomotion on hydrophobic surfaces

Pinchasik, B.-E.-S., Steinkühler, J., Wuytens, P. C., Skirtach, A. G., Fratzl, P., & Möhwald, H. (2015). From beetles in nature to the lab: actuating underwater locomotion on hydrophobic surfaces. Langmuir, 31(51), 13734-13742. doi:10.1021/acs.langmuir.5b03821.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-2861-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7DB1-8
Genre: Journal Article

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 Creators:
Pinchasik, Bat-El Shani1, Author              
Steinkühler, Jan2, Author              
Wuytens, Pieter Chris, Author
Skirtach, Andre G, Author
Fratzl, Peter1, Author              
Möhwald, Helmuth3, Author              
Affiliations:
1Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863294              
2Rumiana Dimova, Theorie & Bio-Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863328              
3Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863284              

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 Abstract: Controlled wetting and de-wetting of surfaces is a primary mechanism used by beetles in nature such as the lady bird and the leaf beetle for underwater locomotion. Their adhesion to surfaces underwater is enabled through the attachment of bubbles entrapped in their setae covered legs. Locomotion, however, is done by applying mechanical forces on the bubbles in order to move, attach and detach them in a controlled manner. In synthetic conditions, however, when a bubble is bound to a surface, it is merely impossible to maneuver without the use of external stimuli. Thus, actuated wetting and de-wetting of surfaces remain challenges. Here, electrowetting on dielectrics (EWOD) is used for the manipulation of bubble-particle complexes on unpatterned surfaces. Bubbles nucleate on catalytic Janus disks adjacent to a hydrophobic surface. By changing the wettability of the surface through electrowetting the bubbles show a variety of reactions, depending on the shape and periodicity of the electric signal. Time resolved (µs) imaging of bubble radial oscillations reveals the possible mechanisms for lateral mobility of bubbles on a surface under electrowetting: bubble instability is induced when electric pulses are carefully adjusted. This instability is adjusted to control the surface bound bubble locomotion and described in terms of the change in surface energy. It is shown that a deterministic force applied normal can lead to a random walk of micrometer-sized bubbles by exploiting the phenomenon of contact angle hysteresis. Finally, bubble use in nature for underwater locomotion and the actuated bubble locomotion presented in this study are compared.

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 Dates: 2015-12-032015
 Publication Status: Published in print
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 Identifiers: DOI: 10.1021/acs.langmuir.5b03821
PMID: 0481
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Title: Langmuir
Source Genre: Journal
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Publ. Info: Columbus, OH : American Chemical Society
Pages: - Volume / Issue: 31 (51) Sequence Number: - Start / End Page: 13734 - 13742 Identifier: ISSN: 0743-7463