Adhesion tilt-tolerance in bio-inspired mushroom-shaped adhesive microstructure

Heepe, Lars; Carbone, Giuseppe; Pierro, Elena; Kovalev, Alexander; Gorb, Stanislav N.

doi:10.1063/1.4860991

Cited by 41 publications

(27 citation statements)

References 24 publications

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“…Male beetles generated higher adhesion than females, which was previously reported and explained by the presence of specialized setae with discoidal tips that can generate higher adhesion on smooth substrates due to their advantageous, geometry-induced homogenous stress distribution [58–60]. Similar results were previously obtained for chysomelid beetles [5,61].…”

Section: Discussionsupporting

confidence: 83%

Influence of ambient humidity on the attachment ability of ladybird beetles (Coccinella septempunctata)

Heepe¹,

Wolff²,

Gorb³

2016

Beilstein J. Nanotechnol.

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SummaryMany insects possess adhesive foot pads, which enable them to scale smooth vertical surfaces. The function of these organs may be highly affected by environmental conditions. Ladybird beetles (Coccinellidae) possess dense tarsal soles of tenent setae, supplemented with an adhesive fluid. We studied the attachment ability of the seven-spotted ladybird beetle (Coccinella septempunctata) at different humidities by horizontal traction experiments. We found that both low (15%) and high (99%) relative humidities lead to a decrease of attachment ability. The significantly highest attachment forces were revealed at 60% humidity. This relationship was found both in female and male beetles, despite of a deviating structure of adhesive setae and a significant difference in forces between sexes. These findings demonstrate that not only dry adhesive setae are affected by ambient humidity, but also setae that stick due to the capillarity of an oily secretion.

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Section: Discussionsupporting

confidence: 83%

Influence of ambient humidity on the attachment ability of ladybird beetles (Coccinella septempunctata)

Heepe¹,

Wolff²,

Gorb³

2016

Beilstein J. Nanotechnol.

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“…The white traces in A3, B4, and C4 outline the contact area prior to detachment. For comparison, detachment sequences in the dry state are shown [4,9,11,17]. Scale bar, 10 µm.…”

Section: Resultsmentioning

confidence: 99%

Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure

Heepe¹,

Kovalev²,

Gorb³

2014

Beilstein J. Nanotechnol.

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SummaryIn this work we report on experiments aimed at testing the cavitation hypothesis [Varenberg, M.; Gorb, S. J. R. Soc., Interface 2008, 5, 383–385] proposed to explain the strong underwater adhesion of mushroom-shaped adhesive microstructures (MSAMSs). For this purpose, we measured the pull-off forces of individual MSAMSs by detaching them from a glass substrate under different wetting conditions and simultaneously video recording the detachment behavior at very high temporal resolution (54,000–100,000 fps). Although microcavitation was observed during the detachment of individual MSAMSs, which was a consequence of water inclusions present at the glass–MSAMS contact interface subjected to negative pressure (tension), the pull-off forces were consistently lower, around 50%, of those measured under ambient conditions. This result supports the assumption that the recently observed strong underwater adhesion of MSAMS is due to an air layer between individual MSAMSs [Kizilkan, E.; Heepe, L.; Gorb, S. N. Underwater adhesion of mushroom-shaped adhesive microstructure: An air-entrapment effect. In Biological and biomimetic adhesives: Challenges and opportunities; Santos, R.; Aldred, N.; Gorb, S. N.; Flammang, P., Eds.; The Royal Society of Chemistry: Cambridge, U.K., 2013; pp 65–71] rather than by cavitation. These results obtained due to the high-speed visualisation of the contact behavior at nanoscale-confined interfaces allow for a microscopic understanding of the underwater adhesion of MSAMSs and may aid in further development of artificial adhesive microstructures for applications in predominantly liquid environments.

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“…copepods, which consist of opal teeth connected to the mandible via a rubber-like bearing46. Such joint-like elastic elements generally reduce stress concentrations47 and may allow structures to go round the applied load avoiding mechanical failure.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Locomotion Efficiency of a Bio-inspired Walking Robot using Contact Surfaces with Frictional Anisotropy

Manoonpong

Petersen

Kovalev

et al. 2016

Sci Rep

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Based on the principles of morphological computation, we propose a novel approach that exploits the interaction between a passive anisotropic scale-like material (e.g., shark skin) and a non-smooth substrate to enhance locomotion efficiency of a robot walking on inclines. Real robot experiments show that passive tribologically-enhanced surfaces of the robot belly or foot allow the robot to grip on specific surfaces and move effectively with reduced energy consumption. Supplementing the robot experiments, we investigated tribological properties of the shark skin as well as its mechanical stability. It shows high frictional anisotropy due to an array of sloped denticles. The orientation of the denticles to the underlying collagenous material also strongly influences their mechanical interlocking with the substrate. This study not only opens up a new way of achieving energy-efficient legged robot locomotion but also provides a better understanding of the functionalities and mechanical properties of anisotropic surfaces. That understanding will assist developing new types of material for other real-world applications.

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Adhesion tilt-tolerance in bio-inspired mushroom-shaped adhesive microstructure

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Cited by 41 publications

References 24 publications

Influence of ambient humidity on the attachment ability of ladybird beetles (Coccinella septempunctata)

Influence of ambient humidity on the attachment ability of ladybird beetles (Coccinella septempunctata)

Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure

Enhanced Locomotion Efficiency of a Bio-inspired Walking Robot using Contact Surfaces with Frictional Anisotropy

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