From beetles in nature to the laboratory: actuating underwater locomotion on hydrophobic surfaces
- Author
- Bat-El Pinchasik, Jan Steinkühler, Pieter Wuytens (UGent) , Andre Skirtach (UGent) , Peter Fratzl and Helmuth Möhwald
- Organization
- Project
- Abstract
- The controlled wetting and dewetting of surfaces is a primary mechanism used by beetles in nature, such as the ladybird and the leaf beetle for underwater locomotion.(1) Their adhesion to surfaces underwater is enabled through the attachment of bubbles trapped in their setaecovered legs. Locomotion, however, is performed by applying mechanical forces in order to move, attach, and detach the bubbles in a controlled manner. Under synthetic conditions, however, when a bubble is bound to a surface, it is nearly impossible to maneuver without the use of external stimuli. Thus, actuated wetting and dewetting of surfaces remain challenges. Here, electrowetting-on-dielectric (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 electrical signal. Time-resolved (mu s) imaging of bubble radial oscillations reveals possible mechanisms for the lateral mobility of bubbles on a surface under electrowetting: bubble instability is induced when electric pulses are carefully adjusted. This instability is used to control the surface-bound bubble locomotion and is 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.
- Keywords
- ON-DIELECTRIC EWOD, CONTACT-ANGLE HYSTERESIS, SUPERHYDROPHOBIC SURFACES, WETTABILITY TRANSITION, BUBBLES, MODEL, COMBINATION, SATURATION, PARTICLES, DIFFUSION
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-7064110
- MLA
- Pinchasik, Bat-El, et al. “From Beetles in Nature to the Laboratory: Actuating Underwater Locomotion on Hydrophobic Surfaces.” LANGMUIR, vol. 31, no. 51, 2015, pp. 13734–42, doi:10.1021/acs.langmuir.5b03821.
- APA
- Pinchasik, B.-E., Steinkühler, J., Wuytens, P., Skirtach, A., Fratzl, P., & Möhwald, H. (2015). From beetles in nature to the laboratory: actuating underwater locomotion on hydrophobic surfaces. LANGMUIR, 31(51), 13734–13742. https://doi.org/10.1021/acs.langmuir.5b03821
- Chicago author-date
- Pinchasik, Bat-El, Jan Steinkühler, Pieter Wuytens, Andre Skirtach, Peter Fratzl, and Helmuth Möhwald. 2015. “From Beetles in Nature to the Laboratory: Actuating Underwater Locomotion on Hydrophobic Surfaces.” LANGMUIR 31 (51): 13734–42. https://doi.org/10.1021/acs.langmuir.5b03821.
- Chicago author-date (all authors)
- Pinchasik, Bat-El, Jan Steinkühler, Pieter Wuytens, Andre Skirtach, Peter Fratzl, and Helmuth Möhwald. 2015. “From Beetles in Nature to the Laboratory: Actuating Underwater Locomotion on Hydrophobic Surfaces.” LANGMUIR 31 (51): 13734–13742. doi:10.1021/acs.langmuir.5b03821.
- Vancouver
- 1.Pinchasik B-E, Steinkühler J, Wuytens P, Skirtach A, Fratzl P, Möhwald H. From beetles in nature to the laboratory: actuating underwater locomotion on hydrophobic surfaces. LANGMUIR. 2015;31(51):13734–42.
- IEEE
- [1]B.-E. Pinchasik, J. Steinkühler, P. Wuytens, A. Skirtach, P. Fratzl, and H. Möhwald, “From beetles in nature to the laboratory: actuating underwater locomotion on hydrophobic surfaces,” LANGMUIR, vol. 31, no. 51, pp. 13734–13742, 2015.
@article{7064110, abstract = {{The controlled wetting and dewetting of surfaces is a primary mechanism used by beetles in nature, such as the ladybird and the leaf beetle for underwater locomotion.(1) Their adhesion to surfaces underwater is enabled through the attachment of bubbles trapped in their setaecovered legs. Locomotion, however, is performed by applying mechanical forces in order to move, attach, and detach the bubbles in a controlled manner. Under synthetic conditions, however, when a bubble is bound to a surface, it is nearly impossible to maneuver without the use of external stimuli. Thus, actuated wetting and dewetting of surfaces remain challenges. Here, electrowetting-on-dielectric (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 electrical signal. Time-resolved (mu s) imaging of bubble radial oscillations reveals possible mechanisms for the lateral mobility of bubbles on a surface under electrowetting: bubble instability is induced when electric pulses are carefully adjusted. This instability is used to control the surface-bound bubble locomotion and is 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.}}, author = {{Pinchasik, Bat-El and Steinkühler, Jan and Wuytens, Pieter and Skirtach, Andre and Fratzl, Peter and Möhwald, Helmuth}}, issn = {{0743-7463}}, journal = {{LANGMUIR}}, keywords = {{ON-DIELECTRIC EWOD,CONTACT-ANGLE HYSTERESIS,SUPERHYDROPHOBIC SURFACES,WETTABILITY TRANSITION,BUBBLES,MODEL,COMBINATION,SATURATION,PARTICLES,DIFFUSION}}, language = {{eng}}, number = {{51}}, pages = {{13734--13742}}, title = {{From beetles in nature to the laboratory: actuating underwater locomotion on hydrophobic surfaces}}, url = {{http://doi.org/10.1021/acs.langmuir.5b03821}}, volume = {{31}}, year = {{2015}}, }
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