Molecular Origins of Elastomeric Friction

Sills, Scott; Vorvolakos, Katherine; Chaudhury, Manoj K.; Overney, René M.

doi:10.1007/978-3-540-36807-6_30

Cited by 15 publications

(15 citation statements)

References 51 publications

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“…When the tip is in contact with the substrate, increasing the normal force will greatly increase the contact area resulting in greater numbers of bond formation between protein and the tip, hence greater frictional force. Number of bonds formed between tip and protein film is exponentially increased with normal force, so called kinetics rate equation [32]. This result supported the above theory that the normal force affected the amyloid nucleation by increasing the number of bond formation and resulting in more pick-up probability.…”

Section: Normal Force Frictional Force and Amyloid Nucleation Ratesupporting

confidence: 77%

“…In polymer films, including protein, Overney et al described the friction due to stretching the protruded chain segment, which causes sawtooth patterns in lateral profiles [67]. Stretching of the long molecules is a major origin of friction especially for elastomers [32,37], synthetic polymers [68] and various protein films [35,36]. Plowing [69] and dragging protein chains on the surface [70] can also increase the frictional force.…”

Section: Discussionmentioning

confidence: 99%

“…[32] Earlier work in 19's focused on trying to explain the friction of rubbers on smooth surface. Modern work extended the model to other soft matter such as surfactant [33], alkanothiol monolayer [34], and protein films [35] [36].…”

Section: Friction On Biomolecular Filmmentioning

confidence: 99%

“…In the theory, two mechanisms are incorporated. Interfacial adhesion is the mechanism that the friction is generated by chemical bond forming-breaking between two interfaces, directly related to the adhesion force between two surfaces [34], while internal cohesion refers to energy dissipation is expense for the polymer chain deforms elastically [32] [37].…”

Section: Friction On Biomolecular Filmmentioning

confidence: 99%

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Direct Observation of Amyloid Nucleation under Nanomechanical Stretching

et al. 2013

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Self-assembly of amyloid nanofiber is associated with functional and pathological processes such as in neurodegenerative diseases. Despite intensive studies, stochastic nature of the process has made it difficult to elucidate molecular mechanisms for the key amyloid nucleation. Here, we investigated the amyloid nucleation of silk-elastinlike peptide (SELP) using time-lapse lateral force microscopy (LFM). By repeated scanning a single line on a SELP-coated mica surface, we observed sudden stepwise height increases, corresponds to nucleation of an amyloid fiber. The lateral force profiles followed either a worm-like chain model or an exponential function, suggesting that the atomic force microscopy (AFM) tip stretches a single or multiple SELP molecules along the scanning direction, serves as the template for further selfassembly perpendicular to the scan direction. Such mechanically induced nucleation of amyloid fibrils allows positional and directional control of amyloid assembly in vitro, which we demonstrate by generating single nanofibers at predetermined nucleation sites.

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Section: Normal Force Frictional Force and Amyloid Nucleation Ratesupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Friction On Biomolecular Filmmentioning

confidence: 99%

Section: Friction On Biomolecular Filmmentioning

confidence: 99%

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Direct Observation of Amyloid Nucleation under Nanomechanical Stretching

et al. 2013

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“…For highly compliant tribo-surfaces (e.g. elastomers), this internal cohesion is comparable to the interfacial adhesion and both dissipation processes have a significant contribution to the overall friction 26…”

Section: Introductionmentioning

confidence: 99%

Influence of fluid viscosity and wetting on multiscale viscoelastic lubrication in soft tribological contacts

2017

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Friction (and lubrication) between soft contacts is prevalent in many natural and engineered systems and plays a crucial role in determining their functionality. The contribution of viscoelastic hysteresis losses to friction in these systems has been well-established and defined for dry contacts; however, the influence of fluid viscosity and wetting on these components of friction has largely been overlooked. We provide systematic experimental evidence of the influence of lubricant viscosity and wetting on lubrication across multiple regimes within a viscoelastic contact. These effects are investigated for comparatively smooth and rough elastomeric contacts (PTFE-PDMS and PDMS-PDMS) lubricated by a series of Newtonian fluids with systematically controlled viscosity and static wetting properties, using a ball-on-disc tribometer. The distinct tribological behaviour, characterised generally by a decrease in the friction coefficient with increasing fluid viscosity and wettability, is explained in terms of lubricant dewetting and squeeze-out dynamics and their impact on multi-scale viscoelastic dissipation mechanisms at the bulk-, asperity-, sub-asperity- and molecular-scale. It is proposed that lubrication within the (non-molecularly) smooth contact is governed by localised fluid entrapment and molecular-scale (interfacial) viscoelastic effects, while additional rubber hysteresis stimulated by fluid-asperity interactions, combined with rapid fluid drainage at low speeds within the rough contact, alter the general shape of the Stribeck curve. This fluid viscosity effect is in some agreement with theoretical predictions. Conventional methods for analysing and interpreting tribological data, which typically involve scaling sliding velocity with lubricant viscosity, need to be revised for viscoelastic contacts with consideration of these indirect viscosity effects.

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Recent Advances in Rubber Friction in the Context of Tire Traction

Pan

2013

Polymer Adhesion, Friction, and Lubrication

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Molecular Origins of Elastomeric Friction

Cited by 15 publications

References 51 publications

Direct Observation of Amyloid Nucleation under Nanomechanical Stretching

Direct Observation of Amyloid Nucleation under Nanomechanical Stretching

Influence of fluid viscosity and wetting on multiscale viscoelastic lubrication in soft tribological contacts

Recent Advances in Rubber Friction in the Context of Tire Traction

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