Experimental Parameters Controlling Adhesion of Biomimetic Fibrillar Surfaces

Greiner, Christian; Buhl, Sebastian; Campo, Aránzazu del; Arzt, Eduard

doi:10.1080/00218460902997042

Cited by 33 publications

(46 citation statements)

References 39 publications

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“…This insensitivity to humidity was also observed by other researchers [30]. Displacement control of the linear stage was used to provide an increasing series of preloads, and the maximum adhesion was measured for each point.…”

Section: Journal Of Adhesion Science and Technology 2643mentioning

confidence: 82%

Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives

Sameoto

Sharif

Menon

2012

Journal of Adhesion Science and Technology

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The effectiveness of biomimetic dry adhesives at different ambient pressures was investigated. Biomimetic dry adhesives have great potential for space applications but there have been few studies on how these adhesives perform in low-pressure environments. The best performing geometry for dry adhesives with respect to normal adhesion has previously been determined to be mushroom shaped fibers, but the pressure sensitivity of these designs has been unclear -with some groups reporting pressure dependent adhesion, and others claiming no effect. We have compared the microscale adhesion of mushroom shaped polymer fibers at different ambient pressures and have determined that suction cup effects are negligible for fibers with caps less than 16.4 μm in diameter. Further investigation in this work showed that a simple suction cup model provided estimates for the geometry requirements for a non-negligible suction cup effect and determined that the minimum cap radius for the 10 μm pillar diameter used in this study should be over 26 μm -past the dimension that can be successfully fabricated using this technology.

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Section: Journal Of Adhesion Science and Technology 2643mentioning

confidence: 82%

Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives

Sameoto

Sharif

Menon

2012

Journal of Adhesion Science and Technology

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“…[11,12] Experimental measurements on synthetic structured surfaces show inconclusive results. [20][21][22] However, for finite humidity, a capillary contribution to the adhesion of fibrillar surfaces must be expected. [2,11,12,23,24] The benefit of fibrillar surfaces for adhesion has also been justified by other theoretical approaches.…”

Section: Physical Principles and Design Strategies For Fibrillar Adhementioning

confidence: 98%

“…The influence of the backing layer has been experimentally addressed [22,96] and theoretically modeled. [96,118] An increase in the adhesion force with decreasing thickness of the backing layer was found experimentally on patterned PDMS samples with flat-terminated fibrils [22] and PU patterns with mushroomterminated fibrils [96] (Fig.…”

Section: Backing Layermentioning

confidence: 99%

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Gecko‐Inspired Surfaces: A Path to Strong and Reversible Dry Adhesives

et al. 2010

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The amazing adhesion of gecko pads to almost any kind of surfaces has inspired a very active research direction over the last decade: the investigation of how geckos achieve this feat and how this knowledge can be turned into new strategies to reversibly join surfaces. This article reviews the fabrication approaches used so far for the creation of micro- and nanostructured fibrillar surfaces with adhesive properties. In the light of the pertinent contact mechanics, the adhesive properties are presented and discussed. The decisive design parameters are fiber radius and aspect ratio, tilt angle, hierarchical arrangement and the effect of the backing layer. Also first responsive systems that allow thermal switching between nonadhesive and adhesive states are described. These structures show a high potential of application, providing the remaining issues of robustness, reliability, and large-area manufacture can be solved.

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“…[118] (v) Effect of backing layer: the adhesion performance has been shown to increase with decreasing thickness of the backing layer. [65,119] This was explained by a more equal load sharing for thinner backing layers during pull-off resulting in higher adhesion. Thick backing layers deform during pulling and this leads to stress concentrations at the edge of the substrate, similar to a rigid punch in adhesive contact with a half space.…”

Section: Summary Of Fibril Geometry-adhesion Relationshipsmentioning

confidence: 99%

Functional Adhesive Surfaces with “Gecko” Effect: The Concept of Contact Splitting

et al. 2010

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Nature has developed reversibly adhesive surfaces whose stickiness has attracted much research attention over the last decade. The central lesson from nature is that “patterned” or “fibrillar” surfaces can produce higher adhesion forces to flat and rough substrates than smooth surfaces. This paper critically examines the principles behind fibrillar adhesion from a contact mechanics perspective, where much progress has been made in recent years. The benefits derived from “contact splitting” into fibrils are separated into extrinsic/intrinsic contributions from fibril deformation, adaptability to rough surfaces, size effects due to surface‐to‐volume ratio, uniformity of stress distribution, and defect‐controlled adhesion. Another section covers essential considerations for reliable and reproducible adhesion testing, where better standardization is still required. It is argued that, in view of the large number of parameters, a thorough understanding of adhesion effects is required to enable the fabrication of reliable adhesive surfaces based on biological examples.

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Experimental Parameters Controlling Adhesion of Biomimetic Fibrillar Surfaces

Cited by 33 publications

References 39 publications

Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives

Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives

Gecko‐Inspired Surfaces: A Path to Strong and Reversible Dry Adhesives

Functional Adhesive Surfaces with “Gecko” Effect: The Concept of Contact Splitting

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