A Gecko‐Inspired Reversible Adhesive

Northen, Michael T.; Greiner, Christian; Arzt, Eduard; Turner, Kimberly L.

doi:10.1002/adma.200801340

Cited by 198 publications

(182 citation statements)

References 27 publications

(34 reference statements)

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“…The potential to incorporate switchability in adhesion has only recently been explored. Examples include systems that respond to external stimuli such as temperature [4,5], magnetic field [6], mechanical deformation [7,8] and pneumatic pressure [9,10]. The common underlying principle is a reversible change in the area of contact between the adhesive surface and the test probe, leading to a change in adhesion.…”

Section: Introductionmentioning

confidence: 99%

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Paretkar

Kamperman

Martina

et al. 2013

J. R. Soc. Interface.

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We tested the adhesive response of polymer surfaces structured with arrays of cylindrical fibrils having diameters of 10 -20 mm and aspect ratios 1-2.4. Fibrils had two different tip shapes of end-flaps and round edges. A preloadinduced mechanical buckling instability of the fibrils was used to switch between the states of adhesion and non-adhesion. Non-adhesion in fibrils with round edges was reached at preloads that caused fibril buckling, whereas fibrils with end-flaps showed adhesion loss only at very high preloads. The round edge acted as a circumferential flaw prohibiting smooth tip contact recovery leading to an adhesion loss. In situ observations showed that, after reversal of buckling, the end-flaps unfold and re-form contact under prevailing compressive stress, retaining adhesion in spite of buckling. At very high preloads, however, end-flaps are unable to re-form contact resulting in adhesion loss. Additionally, the end-flaps showed varying contact adaptability as a function of the fibril -probe alignment, which further affects the preload for adhesion loss. The combined influence of preload, tip shape and alignment on adhesion can be used to switch adhesion in bioinspired fibrillar arrays.

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Section: Introductionmentioning

confidence: 99%

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Paretkar

Kamperman

Martina

et al. 2013

J. R. Soc. Interface.

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“…An impressive variety of synthetic mimics that capture the adhesive qualities of the gecko system has already been developed [6 -15]. Some prominent examples include designs based on photoresist nanorods on solid micropillar-supported platforms and micropaddles [7,9], polyurethane microfibres with angled mushroom tips [10], micro-and nano-integrated hierarchical polymeric hairs [11], and carbon nanotube brushes/forests [14,15]. Notably, the adhesion of some synthetics has even reached up to 1000 KPa [15,16], about 10 times higher than what a gecko can achieve.…”

Section: Introductionmentioning

confidence: 99%

Dynamic self-cleaning in gecko setae via digital hyperextension

Lopez

Niewiarowski

et al. 2012

J. R. Soc. Interface.

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Gecko toe pads show strong adhesion on various surfaces yet remain remarkably clean around everyday contaminants. An understanding of how geckos clean their toe pads while being in motion is essential for the elucidation of animal behaviours as well as the design of biomimetic devices with optimal performance. Here, we test the self-cleaning of geckos during locomotion. We provide, to our knowledge, the first evidence that geckos clean their feet through a unique dynamic self-cleaning mechanism via digital hyperextension. When walking naturally with hyperextension, geckos shed dirt from their toes twice as fast as they would if walking without hyperextension, returning their feet to nearly 80 per cent of their original stickiness in only four steps. Our dynamic model predicts that when setae suddenly release from the attached substrate, they generate enough inertial force to dislodge dirt particles from the attached spatulae. The predicted cleaning force on dirt particles significantly increases when the dynamic effect is included. The extraordinary design of gecko toe pads perfectly combines dynamic self-cleaning with repeated attachment/detachment, making gecko feet sticky yet clean. This work thus provides a new mechanism to be considered for biomimetic design of highly reuseable and reliable dry adhesives and devices.

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“…Sameoto et al [123] fabricated a surface that combines the macroscale substrate and the fiber array to increase adaptability. Northen et al [124] reported a method to actively switch between adhesion and non-adhesion by controlling the orientation of the cantilever by a magnetic field; the adhesion strength was only 14 Pa, but provided the general proof-ofconcept that adhesion can be reversibly controlled through an external stimulus.…”

Section: Fabrication Of Gecko-inspired Surfaces With Strong Adhesionmentioning

confidence: 99%

Recent advances in gecko adhesion and friction mechanisms and development of gecko-inspired dry adhesive surfaces

et al. 2013

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Abstract:The remarkable ability of geckos to climb and run rapidly on walls and ceilings has recently received considerable interest from many researchers. Significant progress has been made in understanding the attachment and detachment mechanisms and the fabrication of articulated gecko-inspired adhesives and structured surfaces. This article reviews the direct experiments that have investigated the properties of gecko hierarchical structures, i.e., the feet, toes, setae, and spatulae, and the corresponding models to ascertain the mechanical principles involved. Included in this review are reports on gecko-inspired surfaces and structures with strong adhesion forces, high ratios of adhesion and friction forces, anisotropic hierarchical structures that give rise to directional adhesion and friction, and "intelligent" attachment and detachment motions.

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A Gecko‐Inspired Reversible Adhesive

Cited by 198 publications

References 27 publications

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Dynamic self-cleaning in gecko setae via digital hyperextension

Recent advances in gecko adhesion and friction mechanisms and development of gecko-inspired dry adhesive surfaces

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