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Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements
Open accessAbstract
The hairy attachment system on a gecko's toes, consisting of one billion spatulae in the case of Gekko gecko [Ruibal, R. & Ernst, V. (1965) J. Morphol. 117, 271–294], allows it to adhere to nearly all surface topographies. The mechanistic basis for gecko adhesion has been intensely investigated, but the lowest hierarchical level, that of the spatula, has become experimentally accessible only recently. This report details measurements of the adhesion force exerted by a single gecko spatula for various atmospheric conditions and surface chemistries. Through judicious choice and modification of substrates, the short- and long-range adhesive forces are separated. In contrast to previous work [Autumn, K., Sitti, M., Liang, Y. C. A., Peattie, A. M., Hansen, W. R., Sponberg, S., Kenny, T. W., Fearing, R., Israelachvili, J. N. & Full, R. J. (2002) Proc. Natl. Acad. Sci. USA 99, 12252–12256 ], our measurements clearly show that humidity contributes significantly to gecko adhesion on a nanoscopic level. These findings are crucial for the development of artificial biomimetic attachment systems.
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Metadata
- Authors
- Huber, G., Mantz, H., Spolenak, R., Mecke, K., Jacobs, K., Gorb, S. N., & Arzt, E.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2005-10-31
- Volume
- 102
- Issue
- 45
- Pages
- 16293-16296
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2157113937
- Cited by
- 652
- References
- 1
- FWCI
- 55.85
- Type
- journal article
- Language
- en
- Open access
- green
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- Huber, G., Mantz, H., Spolenak, R., Mecke, K., Jacobs, K., Gorb, S. N., & Arzt, E. (2005). Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0506328102
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