Evidence for self-cleaning in gecko setae
Open accessAbstract
A tokay gecko can cling to virtually any surface and support its body mass with a single toe by using the millions of keratinous setae on its toe pads. Each seta branches into hundreds of 200-nm spatulae that make intimate contact with a variety of surface profiles. We showed previously that the combined surface area of billions of spatulae maximizes van der Waals interactions to generate large adhesive and shear forces. Geckos are not known to groom their feet yet retain their stickiness for months between molts. How geckos manage to keep their feet clean while walking about with sticky toes has remained a puzzle until now. Although self-cleaning by water droplets occurs in plant and animal surfaces, no adhesive has been shown to self-clean. In the present study, we demonstrate that gecko setae are a self-cleaning adhesive. Geckos with dirty feet recovered their ability to cling to vertical surfaces after only a few steps. Self-cleaning occurred in arrays of setae isolated from the gecko. Contact mechanical models suggest that self-cleaning occurs by an energetic disequilibrium between the adhesive forces attracting a dirt particle to the substrate and those attracting the same particle to one or more spatulae. We propose that the property of self-cleaning is intrinsic to the setal nanostructure and therefore should be replicable in synthetic adhesive materials in the future.
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Gecko adhesive has been observed to self-clean when it becomes contaminated.
“however, gecko adhesive has been observed to self-clean when it becomes contaminated [26].”
From Human climbing with efficiently scaled gecko-inspired dry adhesives (2015) · cites this paper as [26]
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“Gecko setal arrays have the excellent ability of self-cleaning [2], which has a considerably wider potential application than pressure-sensitive adhesives (PSA) in several areas, such as robotics for rescue and detection, counterterrorism, chemical sensing, and space positioning.”
BackgroundChanges in materials properties explain the effects of humidity on gecko adhesion
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“, 2002), a quick-release mechanism (Russell, 2002), near-indefinite reusability, and self-cleaning (Hansen and Autumn, 2005) make gecko adhesion mechanics interesting not just to researchers in the natural sciences but also to those in engineering disciplines.”
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“…increase the contact fraction substantially to achieve the extraordinary values of adhesion and friction that have been measured in whole animals (Autumn et al. 2002b; Hansen and Autumn 2005; Irschick et al. 1996) and isolated setae (Autumn et al. 2000; Autumn et al. 2002b; Hansen and Autumn 2005).”
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- Authors
- Hansen, W. R., & Autumn, K.
- Affiliations
- Lewis & Clark College (US)
- University of California, Santa Barbara (US)
- Corresponding author
- Autumn, K.
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2005-01-03
- Volume
- 102
- Issue
- 2
- Pages
- 385-389
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC544316
- OpenAlex
- W2114147125
- Cited by
- 601
- References
- 27
- Citations by year
- 2026: 12 · 2025: 15 · 2024: 20 · 2023: 18 · 2022: 31 · 2021: 26 · 2020: 46 · 2019: 31 · 2018: 30 · 2017: 27 · 2016: 37 · 2015: 33 · 2014: 29 · 2013: 40 · 2012: 42
- FWCI
- 45.47
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (0304730)
- Advanced Research Projects Agency
- Topics
- Physical Sciences › Engineering › Mechanics of Materials › Adhesion, Friction, and Surface Interactions
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › Surface Modification and Superhydrophobicity
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Keywords
- gecko setae, self-cleaning, van der Waals adhesion, spatulae, Tokay gecko, dry adhesion, contact mechanics, synthetic adhesives
- MeSH terms
- Adhesiveness, Animals, Lizards, Models, Biological
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