Creating Gecko‐Like Adhesives for “Real World” Surfaces

King, Daniel R.; Bartlett, Michael D.; Gilman, Casey; Irschick, Duncan J.; Crosby, Alfred J.

doi:10.1002/adma.201306259

Cited by 118 publications

(103 citation statements)

References 41 publications

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“…It is known that roughness strongly affects adhesion and, for example, limits the maximum lifting force. 4 Several studies were performed which examine the influence of surface roughness on adhesion as a function of the real contact area and elastic material properties. 5−7 An increase in roughness typically leads to a significant loss in contact area and larger distances over which the short-range intermolecular forces have to act.…”

Section: Introductionmentioning

confidence: 99%

Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates

Fischer

Arzt

Hensel

2016

ACS Appl. Mater. Interfaces

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The benefits of synthetic fibrillar dry adhesives for temporary and reversible attachment to hard objects with smooth surfaces have been successfully demonstrated in previous studies. However, surface roughness induces a dramatic reduction in pull-off stresses and necessarily requires revised design concepts. Toward this aim, we introduce cylindrical two-phase single pillars, which are composed of a mechanically stiff stalk and a soft tip layer. Adhesion to smooth and rough substrates is shown to exceed that of conventional pillar structures. The adhesion characteristics can be tuned by varying the thickness of the soft tip layer, the ratio of the Young’s moduli and the curvature of the interface between the two phases. For rough substrates, adhesion values similar to those obtained on smooth substrates were achieved. Our concept of composite pillars overcomes current practical limitations caused by surface roughness and opens up fields of application where roughness is omnipresent.

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Section: Introductionmentioning

confidence: 99%

Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates

Fischer

Arzt

Hensel

2016

ACS Appl. Mater. Interfaces

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“…These attachment devices can provide optimal friction for forward motion, protect animals from slipping on a surface, and even allow them grip surfaces firmly. From this point of view, several works have investigated biological materials678910 and used them as an inspiration to develop materials1112 for robotic applications1314151617.…”

mentioning

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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“…420 More recent work has used the same design principles as the natural system, but in the form of a composite textile that can be made simply, using standard methods. 421 …”

Section: Design For Nanomanufacturingmentioning

confidence: 99%

Nanomanufacturing: A Perspective

2016

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Nanomanufacturing, the commercially-scalable and economically-sustainable mass production of nanoscale materials and devices, represents the tangible outcome of the nanotechnology revolution. In contrast to those used in nanofabrication for research purposes, nanomanufacturing processes must satisfy the additional constraints of cost, throughput, and time to market. Taking silicon integrated circuit manufacturing as a baseline, we consider the factors involved in matching processes with products, examining the characteristics and potential of top-down and bottom-up processes, and their combination. We also discuss how a careful assessment of the way in which function can be made to follow form can enable high-volume manufacturing of nanoscale structures with the desired useful, and exciting, properties.

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Creating Gecko‐Like Adhesives for “Real World” Surfaces

Cited by 118 publications

References 41 publications

Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates

Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates

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

Nanomanufacturing: A Perspective

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