E-Beam Photoresist and Carbon Nanotubes as Biomimetic Dry Adhesives

Tsai, Yao-Chuan; Shih, Wen‐Pin; Wang, Y.-M.; Huang, Long-Sun; Shih, Po‐Jen

doi:10.1109/memsys.2006.1627952

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…To date, the most developed artificial adhesives with highly dense nanometer hairs are based on arrays of polymer pillars and vertically aligned carbon nanotubes (VACNTs). − Unlike polymer-based structures, VACNTs create strong and reversible fibrillar adhesives with great durability, partly due to the superior structure and exceptional mechanical strength of CNTs. ,,− CNT-based dry adhesives were first proposed by Yurdumakan et al, who measured the nanometer-scale adhesion force of VACNTs and found it is ∼200 times higher than that of gecko foot hairs (>1.6 × 10 –2 nN/nm 2 ) . Subsequently, Zhao et al measured the macroscopic adhesion of VACNTs and found it is ∼10 N/cm 2 against glass surface .…”

Section: Introductionmentioning

confidence: 99%

Influence of Packing Density and Surface Roughness of Vertically-Aligned Carbon Nanotubes on Adhesive Properties of Gecko-Inspired Mimetics

Chen

Zhong

Oppenheimer

et al. 2015

ACS Appl. Mater. Interfaces

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ABSTRACT:We have systematically studied the macroscopic adhesive properties of vertically aligned nanotube arrays with various packing density and roughness. Using a tensile setup in shear and normal adhesion, we find that there exists a maximum packing density for nanotube arrays to have adhesive properties. Too highly packed tubes do not offer intertube space for tube bending and side-wall contact to surfaces, thus exhibiting no adhesive properties. Likewise, we also show that the surface roughness of the arrays strongly influences the adhesion properties and the reusability of the tubes. Increasing the surface roughness of the array strengthens the adhesion in the normal direction, but weakens it in the shear direction. Altogether, these results allow progress toward mimicking the gecko's vertical mobility.

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Section: Introductionmentioning

confidence: 99%

Influence of Packing Density and Surface Roughness of Vertically-Aligned Carbon Nanotubes on Adhesive Properties of Gecko-Inspired Mimetics

Chen

Zhong

Oppenheimer

et al. 2015

ACS Appl. Mater. Interfaces

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“…Many groups have successfully exploited the contactsplitting aspect of the gecko adhesive (Geim et al 2003;Yurdumakan et al 2005;Tsai et al 2006;Zhao et al 2006; *Author for correspondence (aaronparness@stanford.edu). Ge et al 2007).…”

Section: Introductionmentioning

confidence: 99%

A microfabricated wedge-shaped adhesive array displaying gecko-like dynamic adhesion, directionality and long lifetime

Parness

Soto

Esparza

et al. 2009

J. R. Soc. Interface.

249

239

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Gecko adhesion has become a paradigmatic example of bio-inspired engineering, yet among the many gecko-like synthetic adhesives (GSAs), truly gecko-like performance remains elusive. Many GSAs have previously demonstrated one or two features of the gecko adhesive. We present a new wedge-shaped GSA that exhibits several gecko-like properties simultaneously: directional features; zero force at detachment; high ratio of detachment force to preload force; non-adhesive default state; and the ability to maintain performance while sliding, even after thousands of cycles. Individual wedges independently detach and reattach during sliding, resulting in high levels of shear and normal adhesion during drag. This behaviour provides a non-catastrophic failure mechanism that is desirable for applications such as climbing robots where sudden contact failure would result in serious falls. The effects of scaling patch sizes up to tens of square centimetres are also presented and discussed. Patches of 1 cm 2 had an adhesive pressure of 5.1 kPa while simultaneously supporting 17.0 kPa of shear. After 30 000 attachment/detachment cycles, a patch retained 67 per cent of its initial adhesion and 76 per cent of its initial shear without cleaning. Square-based wedges of 20 mm and 50 mm are manufactured in a moulding process where moulds are fabricated using a dual-side, dual-angle lithography process on quartz wafers with SU-8 photoresist as the mould material and polydimethylsiloxane as the cast material.

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“…One way that biomimetic dry adhesives have tried to increase the adhesion strength is by increasing the number of fibres in contact by decreasing the fibre diameter [6,7]. This approach has led to innovative but difficult methods of adhesive production by growth of carbon nanotubes and e-beam lithography [8]. 3 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Controllable biomimetic adhesion using embedded phase change material

Krahn

Sameoto

Menon

2010

Smart Mater. Struct.

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In many cases, such as in the instance of climbing robots or temporary adhesives, there is the need to be able to dynamically control the level of adhesion a biomimetic dry adhesive can provide. In this study, the effect of changing the backing layer stiffness of a dry adhesive is examined. Embedding a phase change material within the backing of a synthetic dry adhesive sheet allows the stiffness to be tailored at different points of a preload and adhesion cycle. Larger contact areas and more equal load sharing between adhesive fibres can be achieved by increasing the backing layer stiffness after initial deformation when the adhesive backing is loaded in its softened state. Adhesion behaviour is examined when the backing layer is maintained in solid and softened phases during complete load cycles and for load cycles under the condition of contact with the softened phase backing followed by pull-off during the solid phase. Absolute adhesion force is increased for trials in which a soft backing layer hardens prior to pull-off. This effect is due to the increased contact area made between the rounded probe and the softened material during preloading and the more equal load sharing condition during pull-off when the backing layer becomes stiff again.

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E-Beam Photoresist and Carbon Nanotubes as Biomimetic Dry Adhesives

Cited by 8 publications

References 12 publications

Influence of Packing Density and Surface Roughness of Vertically-Aligned Carbon Nanotubes on Adhesive Properties of Gecko-Inspired Mimetics

Influence of Packing Density and Surface Roughness of Vertically-Aligned Carbon Nanotubes on Adhesive Properties of Gecko-Inspired Mimetics

A microfabricated wedge-shaped adhesive array displaying gecko-like dynamic adhesion, directionality and long lifetime

Controllable biomimetic adhesion using embedded phase change material

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