Untersuchungen zum Feinbau und zur Funktion der Haftborsten von Reptilien

Hiller, U

doi:10.1007/bf00401561

Cited by 234 publications

(183 citation statements)

References 8 publications

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“…In whole-animal shear adhesion trials, geckos were unable to hold their body weight on dry PTFE [8]. This phenomenon has been documented previously [16,17]. Surprisingly, however, when submerged underwater geckos adhered to wet PTFE much stronger than dry, by a factor of four [8].…”

Section: Discussionsupporting

confidence: 62%

“…These 'non-stick' surfaces, like commercially available poly(tetrafluoroethylene) (PTFE), have been known to foil the gecko's incredible adhesive system, rendering them virtually dysfunctional (i.e. unable to support their body weight) [8,16,17]. While not many studies have investigated adhesion to wet fluorinated surfaces, the results are intriguing.…”

Section: Introductionmentioning

confidence: 99%

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Adhesive interactions of geckos with wet and dry fluoropolymer substrates

Stark

Dryden

Olderman

et al. 2015

J. R. Soc. Interface.

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Fluorinated substrates like Teflon w (poly(tetrafluoroethylene); PTFE) are well known for their role in creating non-stick surfaces. We showed previously that even geckos, which can stick to most surfaces under a wide variety of conditions, slip on PTFE. Surprisingly, however, geckos can stick reasonably well to PTFE if it is wet. In an effort to explain this effect, we have turned our attention to the role of substrate surface energy and roughness when shear adhesion occurs in media other than air. In this study, we removed the roughness component inherent to commercially available PTFE and tested geckos on relatively smooth wet and dry fluoropolymer substrates. We found that roughness had very little effect on shear adhesion in air or in water and that the level of fluorination was most important for shear adhesion, particularly in air. Surface energy calculations of the two fluorinated substrates and one control substrate using the Tabor-Winterton approximation and the Young-Dupré equation were used to determine the interfacial energy of the substrates. Using these interfacial energies we estimated the ratio of wet and dry normal adhesion for geckos clinging to the three substrates. Consistent with the results for rough PTFE, our predictions show a qualitative trend in shear adhesion based on fluorination, and the quantitative experimental differences highlight the unusually low shear adhesion of geckos on dry smooth fluorinated substrates, which is not captured by surface energy calculations. Our work has implications for bioinspired design of synthetics that can preferentially stick in water but not in air.

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Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Adhesive interactions of geckos with wet and dry fluoropolymer substrates

Stark

Dryden

Olderman

et al. 2015

J. R. Soc. Interface.

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“…The hierarchical gecko foot structure (8,9) consists of lamellae (400-600 m long), setae (2-10 m wide, 100 m long), and spatulae (Ϸ200 nm wide and long) ( Figs. 1 and 2).…”

mentioning

confidence: 99%

Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements

Huber

Mantz

Spolenak

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

587

494

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“…Electrostatic forces may also be involved: many biological glues are rich in polar and charged residues (amino acids or sugars) and interact with the substrate through electrostatic interactions (Waite 1983). Electrostatic charges seem to be involved in the adhesion of pollen grains to the surface of insect pollinators (Hesse 1981).…”

Section: (C ) Frictional Systemsmentioning

confidence: 99%

Biological attachment devices: exploring nature's diversity for biomimetics

Gorb¹

2008

Phil. Trans. R. Soc. A.

209

200

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Many species of animals and plants are supplied with diverse attachment devices, in which morphology depends on the species biology and the particular function in which the attachment device is involved. Many functional solutions have evolved independently in different lineages of animals and plants. Since the diversity of such biological structures is huge, there is a need for their classification. This paper, based on the original and literature data, proposes ordering of biological attachment systems according to several principles: (i) fundamental physical mechanism, according to which the system operates, (ii) biological function of the attachment device, and (iii) duration of the contact. Finally, we show a biomimetic potential of studies on biological attachment devices.

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Untersuchungen zum Feinbau und zur Funktion der Haftborsten von Reptilien

Cited by 234 publications

References 8 publications

Adhesive interactions of geckos with wet and dry fluoropolymer substrates

Adhesive interactions of geckos with wet and dry fluoropolymer substrates

Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements

Biological attachment devices: exploring nature's diversity for biomimetics

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