Theory of adhesion: Role of surface roughness

Persson, B. N. J.; Scaraggi, Michele

doi:10.1063/1.4895789

Cited by 192 publications

(147 citation statements)

References 53 publications

(75 reference statements)

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“…The real contact area is another important parameter that can be modulated to tune the adhesion between two surfaces [3–4]. A nice example at nano/microscale has been given by S. Casado [5], who shows how the modulation of roughness and adhesion of two different violin bow hairs observed at nanoscale by AFM, may cause strong consequences at mascoscopic scale during the stick–slip phenomenon of the rubbing hairs surfaces and in fine such different acoustic outputs.…”

Section: Introductionmentioning

confidence: 99%

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

Oras

Vlassov

Berholts

et al. 2018

Beilstein J. Nanotechnol.

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Adhesion forces between functionalized gold colloidal nanoparticles (Au NPs) and scanning probe microscope silicon tips were experimentally investigated by atomic force microscopy (AFM) equipped with PeakForce QNM (Quantitative Nanoscale Mechanics) module. Au NPs were synthesized by a seed-mediated process and then functionalized with thiols containing different functional groups: amino, hydroxy, methoxy, carboxy, methyl, and thiol. Adhesion measurements showed strong differences between NPs and silicon tip depending on the nature of the tail functional group. The dependence of the adhesion on ligand density for different thiols with identical functional tail-group was also demonstrated. The calculated contribution of the van der Waals (vdW) forces between particles was in good agreement with experimentally measured adhesive values. In addition, the adhesion forces were evaluated between flat Au films functionalized with the same molecular components and silicon tips to exclude the effect of particle shape on the adhesion values. Although adhesion values on flat substrates were higher than on their nanoparticle counterparts, the dependance on functional groups remained the same.

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Section: Introductionmentioning

confidence: 99%

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

Oras

Vlassov

Berholts

et al. 2018

Beilstein J. Nanotechnol.

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“…For soft elastic solids when an adhesive interaction occur between the solids as in the case studied in this paper, the area of real contact will also increase in which case (3) with κ ≈ 2 is no longer accurate. In this case one must distinguish between two cases [24][25][26]: (a) If the adhesive interaction is not too strong, (3) is still approximately valid, but κ is larger than 2. In this case, if adhesion hysteresis is negligible, no adhesion will be observed in a pull-off experiment.…”

Section: System C20mentioning

confidence: 99%

Shearing Nanometer-Thick Confined Hydrocarbon Films: Friction and Adhesion

Sivebæk

Persson

2016

Tribol Lett

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We present Molecular Dynamics (MD) friction and adhesion calculations for nanometer-thick confined hydrocarbon films with molecular lengths 20, 100 and 1400 carbon atoms. We study the dependency of the frictional shear stress on the confining pressure and sliding speed. We present results for the pull-off force as a function of the pull-off speed and the sliding speed. Some of the results are analyzed using the simple cobblestone model and good semi-quantitative agreement between the model predictions and the MD results are found.

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“…They demonstrated that the JKR -rigid transition seems to occur depending on the original Tabor parameter (2.2) for the sphere, rather than the 'local' one E* ¼ 1.5 MPa, we obtain m ≃ 28s 0 /E* which is quite likely now larger than 1 and therefore justifies some enhancement, also in accord to the figures reported in Waters et al [17] for the rough sphere. In the literature, there have been attempts to define a 'scale-dependent' Tabor parameter [18], so that at high magnification, where nanoscale roughness is observed involving asperities which may have radius of curvature in the nm range, Tabor parameter tends to decrease: but the Persson & Scaraggi [18] definition is not of immediate use, and the experiments of Akerboom et al [3] seem to suggest a useful information about the way Tabor parameter should be defined for nanopatterned surfaces against spherical probes.…”

Section: Discussionmentioning

confidence: 99%

A Maugis–Dugdale cohesive solution for adhesion of a surface with a dimple

Papangelo

Ciavarella

2017

J. R. Soc. Interface.

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We study the adhesion of a surface with a 'dimple' which shows a mechanism for a bi-stable adhesive system in surfaces with spaced patterns of depressions, leading to adhesion enhancement, high dissipation and hysteresis. Recent studies were limited mainly to the very short range of adhesion (the so-called JKR regime), while we generalize the study to a Maugis cohesive model. A 'generalized Tabor parameter', given by the ratio of theoretical strength to elastic modulus, multiplied by the ratio of dimple width to depth has been found. It is shown that bistability disappears for generalized Tabor parameter less than about 2. Introduction of the theoretical strength is needed to have significant results when the system has gone in full contact, unless one postulates alternative limits to full contact, such as air entrapment, contaminants or fine scale roughness. Simple equations are obtained for the pull-off and for the full contact pressure in the entire set of the two governing dimensionless parameters. A qualitative comparison with results of recent experiments with nanopatterned bioinspired dry adhesives is attempted in light of the present model.

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Theory of adhesion: Role of surface roughness

Cited by 192 publications

References 53 publications

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

Shearing Nanometer-Thick Confined Hydrocarbon Films: Friction and Adhesion

A Maugis–Dugdale cohesive solution for adhesion of a surface with a dimple

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