Recent advances in the fabrication and adhesion testing of biomimetic dry adhesives

Sameoto, Dan; Menon, Carlo

doi:10.1088/0964-1726/19/10/103001

Cited by 149 publications

(148 citation statements)

References 74 publications

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“…675 cm 2 ). This is partly because the area of adhesive required for climbing increases disproportionately as the scale increases (even with perfectly efficient scaling) owing to the climber's surface area and mass following a square-cube law.…”

Section: /4mentioning

confidence: 98%

Human climbing with efficiently scaled gecko-inspired dry adhesives

Hawkes

Eason

Christensen

et al. 2015

J. R. Soc. Interface.

105

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Since the discovery of the mechanism of adhesion in geckos, many synthetic dry adhesives have been developed with desirable gecko-like properties such as reusability, directionality, self-cleaning ability, rough surface adhesion and high adhesive stress. However, fully exploiting these adhesives in practical applications at different length scales requires efficient scaling (i.e. with little loss in adhesion as area grows). Just as natural gecko adhesives have been used as a benchmark for synthetic materials, so can gecko adhesion systems provide a baseline for scaling efficiency. In the tokay gecko (Gekko gecko), a scaling power law has been reported relating the maximum shear stress s max to the area A:. We present a mechanical concept which improves upon the gecko's non-uniform load-sharing and results in a nearly even load distribution over multiple patches of gecko-inspired adhesive. We created a synthetic adhesion system incorporating this concept which shows efficient scaling across four orders of magnitude of area, yielding an improved scaling power law:. Furthermore, we found that the synthetic adhesion system does not fail catastrophically when a simulated failure is induced on a portion of the adhesive. In a practical demonstration, the synthetic adhesion system enabled a 70 kg human to climb vertical glass with 140 cm 2 of adhesive per hand.

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Section: /4mentioning

confidence: 98%

Human climbing with efficiently scaled gecko-inspired dry adhesives

Hawkes

Eason

Christensen

et al. 2015

J. R. Soc. Interface.

105

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show abstract

“…1 One such example is dry adhesion 2,3 (based solely on interfacial physical interactions), and has been found for geckos, 4 lizards, 5,6 spiders 7,8 and plants 9,10 . The replication of such phenomena (biomimetics) is of potential interest for applications in the biomedical 11,12 and robotics industries 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Bioinspired hook surfaces based upon a ubiquitous weed (Galium aparine) for dry adhesion

Andrews

Badyal

2014

Journal of Adhesion Science and Technology

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTGalium aparine is a plant noted for its ability to attach to solid objects through its microscopic hooked trichomes via a hook and loop mechanism. This dry adhesive behaviour has been mimicked using a simple and inexpensive epoxy resin replica moulding technique. Enhancement of adhesion strength is achieved by varying the epoxy resin replicas' Young's modulus in order to provide strong hook and loop interlocking, whilst retaining sufficient bulk material flexibility for subsequent detachment via a hook uncurling mechanism.

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“…In this paper, we use PDMS as a test molding material to create negative replicas of the laser-machined glass, as PDMS can withstand large strains, is already commonly used in microfluidic and micromolding applications [14][15][16], and is optically transparent, which could be advantageous in applications involving, for example, the microscopy of organisms or cells inside of the fabricated microstructures. We have previously demonstrated the demolding of pillars and microchannels fabricated with femtosecond laser machining, particularly as a tool for studying the geometry and machining quality of the structures [17].…”

Section: Introductionmentioning

confidence: 99%

Molding topologically-complex 3D polymer microstructures from femtosecond laser machined glass

Schaap¹,

Bellouard²

2013

Opt. Mater. Express

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Abstract:The fabrication of complex, three-dimensional microscale shapes that can be replicated over large surfaces is an ongoing challenge, albeit one with a wide range of possible applications such as engineered surfaces with tuned wetting properties, scaffolds for cell studies, or surfaces with tailored optical properties. In this work, we use a two-step femtosecond laser directwrite technique and wet-etching process to fabricate monolithic glass micromolds with complex three-dimensional surface topologies, and demonstrate the replication of these structures in a soft polymer (polydimethylsiloxane, PDMS). To estimate the forces experienced during the demolding for one representative structure, we use a combination of two models -a simple linear elastic model and a numerical hyperelastic model. These models are used to support the high experimental success rates of the demolding process observed, despite the high strain induced in the material during demolding. Since the process used is scalable, this work opens new avenues for low-cost fabrication of surfaces having complex microscale patterns with three-dimensional geometries.

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Recent advances in the fabrication and adhesion testing of biomimetic dry adhesives

Cited by 149 publications

References 74 publications

Human climbing with efficiently scaled gecko-inspired dry adhesives

Human climbing with efficiently scaled gecko-inspired dry adhesives

Bioinspired hook surfaces based upon a ubiquitous weed (Galium aparine) for dry adhesion

Molding topologically-complex 3D polymer microstructures from femtosecond laser machined glass

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