Replication of high-aspect-ratio nanopillar array for biomimetic gecko foot-hair prototype by UV nano embossing with anodic aluminum oxide mold

Kim, Dong Sung; Lee, Hyun Sup; Lee, Jung-Hyun; Kim, Sungjoo; Lee, Kun‐Hong; Moon, Wonkyu; Kwon, Tai Hun

doi:10.1007/s00542-006-0220-1

Cited by 70 publications

(34 citation statements)

References 14 publications

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“…Several types of synthetic dry adhesives have been manufactured, including arrays of vertically oriented multiwall carbon nanotubes [36], [37] and polymer fibers [16], [21], [25], [30]. These adhesives use stiff, hydrophobic materials, and have achieved useful levels of adhesion, but only with careful surface preparation and high normal preloads.…”

Section: Adhesion and Compliancementioning

confidence: 99%

Smooth Vertical Surface Climbing With Directional Adhesion

et al. 2008

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Stickybot is a bioinspired robot that climbs smooth vertical surfaces such as glass, plastic, and ceramic tile at 4 cm/s. The robot employs several design principles adapted from the gecko including a hierarchy of compliant structures, directional adhesion, and control of tangential contact forces to achieve control of adhesion. We describe the design and fabrication methods used to create underactuated, multimaterial structures that conform to surfaces over a range of length scales from centimeters to micrometers. At the finest scale, the undersides of Stickybot's toes are covered with arrays of small, angled polymer stalks. Like the directional adhesive structures used by geckos, they readily adhere when pulled tangentially from the tips of the toes toward the ankles; when pulled in the opposite direction, they release. Working in combination with the compliant structures and directional adhesion is a force control strategy that balances forces among the feet and promotes smooth attachment and detachment of the toes.

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Section: Adhesion and Compliancementioning

confidence: 99%

Smooth Vertical Surface Climbing With Directional Adhesion

et al. 2008

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“…While multiple groups have tested high aspect ratio fibers made of stiff polymers [10][11][12][13] or carbon nanotubes [14,15], these adhesives perform much better in shear than with normal loads. In contrast, softer materials with mushroom shaped fibers demonstrate normal adhesion that is much greater than unstructured surfaces, and can have a high ratio of adhesion strength to preload.…”

Section: Introductionmentioning

confidence: 98%

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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“…For example, Kaji et al introduced nano pillars into a microchannel by utilizing ebeam lithography and dry etching of a quartz plate, and so obtained nanopillar chip was used for an efficient analysis of large DNA fragments (Kaji et al 2004). In biomimetics field, many researchers have tried to mimic the nature's novel structures such as lotus leaf and gecko's foot hairs in which both micro and nano structures play an essential role in characterizing specific features like super-hydrophobicity and dry-adhesiveness (Sitti 2003;Northen and Turner 2005;Lee et al 2006;Kim et al 2006a). Also in tissue engineering, interactions between cell and substrate have been comprehensively investigated, and not only biochemical and mechanical properties but also topography (particularly micro and nano structures) of the substrate was reported to affect cellular behaviours significantly (Flemming et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Nickel stamp fabrication and hot embossing for mass-production of micro/nano combined structures using anodic aluminum oxide

et al. 2008

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Recently, ''micro/nano combined structure'' has attracted many researchers' attentions due to its high potential in various research fields and applications such as biomimetics, tissue engineering, micro systems for biochemical analysis and so forth. The present paper proposes a simple and promising method for mass-production of the micro/nano combined structure, in particular, nano dimple array with micro structures with cost-effective procedures. Three major procedures of (a) master template fabrication; (b) nickel electroforming onto the master template; (c) replication by hot embossing process, are employed: the master template is fabricated by utilizing an anodic aluminium oxide (AAO) process and UV lithography technique; nickel stamp is then obtained by means of electroforming onto the master template; finally, micro/ nano combined structures are moulded on a polymethyl methacrylate (PMMA) substrate using the nickel stamp via hot embossing. So replicated micro/nano combined structures turns out to be quite successful according to experimental observation via scanning electron microscope (SEM) and atomic force microscope (AFM).

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Replication of high-aspect-ratio nanopillar array for biomimetic gecko foot-hair prototype by UV nano embossing with anodic aluminum oxide mold

Cited by 70 publications

References 14 publications

Smooth Vertical Surface Climbing With Directional Adhesion

Smooth Vertical Surface Climbing With Directional Adhesion

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

Nickel stamp fabrication and hot embossing for mass-production of micro/nano combined structures using anodic aluminum oxide

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