Bioinspired Surfaces with Switchable Adhesion

Reddy, S. Sreevardhan; Arzt, Eduard; Campo, Aránzazu del

doi:10.1002/adma.200700733

Cited by 297 publications

(293 citation statements)

References 39 publications

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“…[22] As an additional feature beyond those of the natural systems, it was attempted to make the surface topography of artificial systems switchable between nonadhesive and adhesive state. Shape memory thermoplastic elastomers were used to fabricate micropatterned adhesive surfaces by soft molding of the material at the highest transition temperature, [108] which yielded arrays of vertical micropillars. Mechanical deformation of this topography at the second (lower) transition temperature followed upon cooling to room temperature and the deformed state was non-adhesive and the surface consisted of pillars in a tilted position.…”

Section: Bio-inspired Surfaces With Switchable Adhesionmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

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In this review a strategy for the design of bioinspired, smart, multiscale interfacial (BSMI) materials is presented and put into context with recent progress in the field of BSMI materials spanning natural to artificial to reversibly stimuli‐sensitive interfaces. BSMI materials that respond to single/dual/multiple external stimuli, e.g., light, pH, electrical fields, and so on, can switch reversibly between two entirely opposite properties. This article utilizes hydrophobicity and hydrophilicity as an example to demonstrate the feasibility of the design strategy, which may also be extended to other properties, for example, conductor/insulator, p‐type/n‐type semiconductor, or ferromagnetism/anti‐ferromagnetism, for the design of other BSMI materials in the future.

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Section: Bio-inspired Surfaces With Switchable Adhesionmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

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“…The potential to incorporate switchability in adhesion has only recently been explored. Examples include systems that respond to external stimuli such as temperature [4,5], magnetic field [6], mechanical deformation [7,8] and pneumatic pressure [9,10]. The common underlying principle is a reversible change in the area of contact between the adhesive surface and the test probe, leading to a change in adhesion.…”

Section: Introductionmentioning

confidence: 99%

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Paretkar

Kamperman

Martina

et al. 2013

J. R. Soc. Interface.

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We tested the adhesive response of polymer surfaces structured with arrays of cylindrical fibrils having diameters of 10 -20 mm and aspect ratios 1-2.4. Fibrils had two different tip shapes of end-flaps and round edges. A preloadinduced mechanical buckling instability of the fibrils was used to switch between the states of adhesion and non-adhesion. Non-adhesion in fibrils with round edges was reached at preloads that caused fibril buckling, whereas fibrils with end-flaps showed adhesion loss only at very high preloads. The round edge acted as a circumferential flaw prohibiting smooth tip contact recovery leading to an adhesion loss. In situ observations showed that, after reversal of buckling, the end-flaps unfold and re-form contact under prevailing compressive stress, retaining adhesion in spite of buckling. At very high preloads, however, end-flaps are unable to re-form contact resulting in adhesion loss. Additionally, the end-flaps showed varying contact adaptability as a function of the fibril -probe alignment, which further affects the preload for adhesion loss. The combined influence of preload, tip shape and alignment on adhesion can be used to switch adhesion in bioinspired fibrillar arrays.

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“…This motivates the fabrication of soft elastomeric fibres that are terminated with either a thin film or spatula to enhance contact and adhesion (Gorb et al 2006;Kim & Sitti 2006;del Campo et al 2007;Greiner et al 2007;Reddy et al 2007;Schubert et al 2007;Shen et al 2008;Varenberg & Gorb 2008;Parsaiyana et al 2009). Many research groups have demonstrated that these arrays have adhesion considerably greater than that of a flat surface of the same material (e.g.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of shearing of a microfibre during friction testing of a microfibre array

Kumar

Hui

2010

Proc. R. Soc. A.

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Friction testing of microfibre arrays is typically conducted under displacement boundary conditions. For example, after the application of a compressive preload, the translation stage is fixed in the vertical direction while a shear displacement is applied by translating the stage laterally. A nonlinear rod model is used to compute the normal and shear forces acting on a typical microfibre during such a test. The normal load acting on a typical fibre is found to switch from compression to tension as the shear displacement increases. The critical shear force to detach a fibre is found to depend linearly on the compressive preload. The fibre is also found to become more stable as it is sheared, hence it never buckles. On the other hand, instead of fixing the vertical displacement, when a fibre is subjected to constant normal load, it becomes unstable upon shearing. We show that the buckling load (the applied normal load to make a fibre unstable) of a microfibril is reduced by the application of a shear displacement.

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Bioinspired Surfaces with Switchable Adhesion

Cited by 297 publications

References 39 publications

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Numerical study of shearing of a microfibre during friction testing of a microfibre array

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