Investigation of micro-adhesion by atomic force microscopy

Ouyang, Qin; Ishida, Kazuyoshi; Okada, Katsuzo

doi:10.1016/s0169-4332(00)00804-7

Cited by 66 publications

(44 citation statements)

References 15 publications

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“…Such a high adhesion force at the microscale will lead to setal jumping off during toe pad scrolling. This jump-off event is a common phenomenon that has been observed in many other systems such as atomic force microscope pull-off tests for measuring micro-/nano-adhesion [25,[27][28][29][30][31] and single carbon nanotube peeling tests [32,33].…”

Section: Gecko Detachment Mechanisms With and Without Digital Hyperexmentioning

confidence: 77%

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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Section: Gecko Detachment Mechanisms With and Without Digital Hyperexmentioning

confidence: 77%

Dynamic self-cleaning in gecko setae via digital hyperextension

Lopez

Niewiarowski

et al. 2012

J. R. Soc. Interface.

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“…The total adhesion force in presence of a meniscus will then be given by the sum of the meniscus force and the direct solid-solid contact adhesion. The relative contributions of meniscus, van der Waals and electrostatic force under ambient conditions (50% humidity) for the adhesion of an AFM tip to graphite, mica and MoS 2 were elucidated by Ouyang et al [681]. In all cases, the meniscus force was found to give the largest contribution.…”

Section: Meniscus Forcementioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,242

2,949

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“…approximation is to consider only van der Waals interaction [28,29]. These forces are thus estimated at: …”

Section: Van Der Waals Forcesmentioning

confidence: 99%

Analysis of forces for micromanipulations in dry and liquid media

Gauthier¹,

Régnier²,

Rougeot³

et al. 2006

Journal of Micromechatronics

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During microscale object manipulation, contact (pull-off) forces and non-contact (capillary, van der Waals, and electrostatic) forces determine the behaviour of the micro-objects rather than the inertial forces. The aim of this article is to give an experimental analysis of the physical phenomena at a microscopic scale in dry and liquid media. This article introduces a review of the major differences between dry and submerged micromanipulations. The theoretical influences of the medium on van der Waals forces, electrostatic forces, pull-off forces and hydrodynamic forces are presented. Experimental force measurements based on an AFM system are carried out. These experiments exhibit a correlation better than 40% between the theoretical forces and the measured forces (except for pull-off in water). Finally, some comparative experimental micromanipulation results are described and show the advantages of the liquid medium Keywords Micromanipulation, microrobotics, liquid medium, pull-off force, electrostatic force, hydrodynamic effect, van der Waals force, capillary force.

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Investigation of micro-adhesion by atomic force microscopy

Cited by 66 publications

References 15 publications

Dynamic self-cleaning in gecko setae via digital hyperextension

Dynamic self-cleaning in gecko setae via digital hyperextension

Force measurements with the atomic force microscope: Technique, interpretation and applications

Analysis of forces for micromanipulations in dry and liquid media

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