Compliance of a microfibril subjected to shear and normal loads

Liu, Jingzhou; Hui, Chung‐Yuen; Shen, Lulin; Jagota, Anand

doi:10.1098/rsif.2007.1336

Cited by 21 publications

(20 citation statements)

References 40 publications

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“…The force was measured using weight balances, [67,74] surface-probe [43,49] or microsphereterminated, [38,48,51,57,66,77,88,[92][93][94] nanoindenters, [86,87,95] or forceload cells coupled to monitorized stages [50,80,96] ). In some cases the adhesion setup is combined with a high-magnification video microscope to image the real contact area during the experiment [31,46,47,[97][98][99][100] or the lateral deformation profile of the fibrils during loading or retraction. [51] Measurements using spherical and flat indenters were reported.…”

Section: Testing Methodsmentioning

confidence: 99%

Gecko‐Inspired Surfaces: A Path to Strong and Reversible Dry Adhesives

et al. 2010

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The amazing adhesion of gecko pads to almost any kind of surfaces has inspired a very active research direction over the last decade: the investigation of how geckos achieve this feat and how this knowledge can be turned into new strategies to reversibly join surfaces. This article reviews the fabrication approaches used so far for the creation of micro- and nanostructured fibrillar surfaces with adhesive properties. In the light of the pertinent contact mechanics, the adhesive properties are presented and discussed. The decisive design parameters are fiber radius and aspect ratio, tilt angle, hierarchical arrangement and the effect of the backing layer. Also first responsive systems that allow thermal switching between nonadhesive and adhesive states are described. These structures show a high potential of application, providing the remaining issues of robustness, reliability, and large-area manufacture can be solved.

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Section: Testing Methodsmentioning

confidence: 99%

Gecko‐Inspired Surfaces: A Path to Strong and Reversible Dry Adhesives

et al. 2010

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“…5a). [5][6][7]9,11,14,21,[31][32][33][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78] In shear (or friction) experiments, the sample is moved tangentially to the sample surface (Fig. 5b).…”

Section: Force-displacement Curvesmentioning

confidence: 99%

“…[32,67,68,104,105] This necessitates either the calculation of the contact area from the displacement data or, even better, in situ visualization using a microscope. [31,33,61,63,[75][76][77][78] The change in contact area during the detachment phase is for structured surfaces even more complex, especially for relatively small probe diameters, as single fibrils or fibril clusters detach in a stepwise fashion, leading to non-circular contact areas. [33] To overcome the problems of changing contact area and inhomogeneous strain fields within the sample, adhesion experiments with flat probes were recently performed and compared to tests with spherical probes.…”

Section: Reviewmentioning

confidence: 99%

Functional Adhesive Surfaces with “Gecko” Effect: The Concept of Contact Splitting

et al. 2010

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Nature has developed reversibly adhesive surfaces whose stickiness has attracted much research attention over the last decade. The central lesson from nature is that “patterned” or “fibrillar” surfaces can produce higher adhesion forces to flat and rough substrates than smooth surfaces. This paper critically examines the principles behind fibrillar adhesion from a contact mechanics perspective, where much progress has been made in recent years. The benefits derived from “contact splitting” into fibrils are separated into extrinsic/intrinsic contributions from fibril deformation, adaptability to rough surfaces, size effects due to surface‐to‐volume ratio, uniformity of stress distribution, and defect‐controlled adhesion. Another section covers essential considerations for reliable and reproducible adhesion testing, where better standardization is still required. It is argued that, in view of the large number of parameters, a thorough understanding of adhesion effects is required to enable the fabrication of reliable adhesive surfaces based on biological examples.

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“…This fact has motivated many researchers to fabricate microfibril arrays 1-19 and to study their adhesion and friction behavior. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] It has been found that friction behavior of fibrillar arrays depends on the stiffness of the fibril material. For example, arrays made of soft fibrils with spatulated tips have static and dynamic friction that is lower than that of a flat control surface made of the same material.…”

Section: Introductionmentioning

confidence: 99%

A model for static friction in a film-terminated microfibril array

Liu

Hui

Jagota

et al. 2009

Journal of Applied Physics

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Articles you may be interested inEffect of fluorocarbon self-assembled monolayer films on sidewall adhesion and friction of surface micromachines with impacting and sliding contact interfaces Performance of diamond-like carbon-protected rubber under cyclic friction. I. Influence of substrate viscoelasticity on the depth evolution We model the response of a film-terminated microfibril array subjected to shear through contact with a rigid cylindrical indenter. Our model determines the shear force acting on the indenter for a fixed normal indenter force before the onset of uniform sliding. Consistent with experiment, our model shows that ͑1͒ the contact area increases only slightly with the applied shear and ͑2͒ the fibrils inside the contact zone are subjected to tension at intermediate to large applied shear displacement despite the fact that the applied normal load is compressive. These features can be explained by the fact that in our samples the continuous terminal film supports tension. The model accurately matches the experimentally measured shear force response. With the use of an independently measured critical energy release rate for unstable release of the contact, the model shows how this architecture achieves a strong enhancement in static friction.

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Compliance of a microfibril subjected to shear and normal loads

Cited by 21 publications

References 40 publications

Gecko‐Inspired Surfaces: A Path to Strong and Reversible Dry Adhesives

Gecko‐Inspired Surfaces: A Path to Strong and Reversible Dry Adhesives

Functional Adhesive Surfaces with “Gecko” Effect: The Concept of Contact Splitting

A model for static friction in a film-terminated microfibril array

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