Investigation on the role of interfacial water on the tribology between graphite and metals

Lim, Yeonsoo; Park, Hai-Woong; Caron, Arnaud

doi:10.1039/c8ra10584g

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…In this case, too, we attribute the adhesion to capillary effects but explain the larger measured adhesion force value compared to SiO x vs. graphene based on the larger Au-tip radius R tip . In agreement with our previous results, we set R tip = 25 nm for Au-and Pt-tips [5,43]. For the SiO x -tip, we set R tip = 7 nm in agreement with the manufacturer's data.…”

Section: Resultssupporting

confidence: 58%

Effect of Normal Contact Vibration on Nano-Scale Friction

Choi

Kwan

et al. 2019

Lubricants

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In this work, we investigate the effect of contact vibration on the friction of sliding single asperity contacts of different adhesion strength over a wide range of load and vibration amplitude. We convert the amplitude of vibration to its equivalent modulation force and tip-oscillation velocity. We observe a logarithmic relationship between friction and the ratio of the modulation force to the normal force and between friction and the ratio of sliding velocity to the tip-oscillation velocity. We discuss these logarithmic dependencies based on an induced corrugation of the tip-sample interaction potential.

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Section: Resultssupporting

confidence: 58%

Effect of Normal Contact Vibration on Nano-Scale Friction

Choi

Kwan

et al. 2019

Lubricants

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“…The observed increase effective stiffness with the normal load raises questions regarding its origin. FFM measurements and molecular dynamics simulations on graphene/ graphite and metals in the presence of water surroundings concluded that at high normal loads the water had insignificant effect of friction [58,72]; however, the presence of water was shown to affect the load-dependent friction hysteresis on graphene [39]. Yet, the question whether this effect is specific to the system measured here or may be of more general nature for the interaction between other non-polar liquids with ionic crystals requires further investigation.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Dimensionality and Symmetry Breaking on Nanoscale Friction in the Prandtl–Tomlinson Model with Varying Effective Stiffness

2020

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Friction Force Microscopy (FFM) measurements on NaCl immersed in ethanol display an increase of the effective contact stiffness with the applied load. This stiffness is estimated from the measured local contact interaction of the tip with the NaCl surface and the Prandtl-Tomlinson (PT) parameter, which reflects the relation between the corrugation stiffness and the effective contact stiffness. Different from FFM measurements in ultrahigh vacuum, for measurements in ethanol surroundings the PT parameters showed a maximum with the applied load. We incorporated this measured load-dependent effective stiffness together with the load-dependent amplitude of the corrugation energy into simulations based on the PT model, and studied its effect on the lateral friction for symmetric 1D and 2D potentials, as well as for an asymmetric 1D potentials. The simulations reproduced the experimentally observed non-monotonous behavior of the PT parameter, and enabled a glimpse on the relation of the characteristic observables (mean maximal slip forces and stiffness) with respect to their governing parameters (corrugation energy, effective stiffness). In all, apart from large deviations from symmetry in the interaction potential, the PT parameter provides a reliable estimate for nanoscale friction over periodic surfaces.

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“…Graphite has been used extensively as a lubricant highlighting its capacity to wear resistance between surfaces. This is partially due to the delocalized electrons associated with graphite, coupled with 'aromatic stabilization' (where specific carbon compounds are arranged in energetically favourable conformations that resist change) [48,49].…”

Section: (B) Graphitementioning

confidence: 99%

Pressure induced transformation of biomass to a highly durable, low friction film on steel

Lanigan,

Faas,

Butcher

et al. 2024

Proc. R. Soc. A.

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Herein the authors report a detailed insight into the tribological and chemical mechanisms that take place when leaf matter is present at the wheel/rail interface. The approach used enables further insight into the formation and subsequent effects on friction from leaf derived layers. Results shed insight on the process that facilitates the formation of leaf derived layers, their structure and chemical make-up. Our analysis indicates that polyphenols, a chemical family that include tannins, have an important role in layer formation and hypothesis on the layer's stability, when formed under high pressures. The data indicate that the high pressure found at the wheel/rail interface facilitates conversion of biomass into a tenacious, thin film. This is shown by the increase in the amount of phenolic compounds present. Phenolic compounds are typically rich in oxygen functional groups that have the ability to bind to metal ions. This insight into the composition of the film is expected to enable the development of novel remediation strategies. It highlights the potential for cleaning agents to be used as tools for restoring friction to safe values. This should lead to improvements in the operational performance and safety of rail transport for passengers and train operators.

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Investigation on the role of interfacial water on the tribology between graphite and metals

Abstract: We investigated the role of interfacial water on the atomic-scale tribology of graphite by contact atomic force microscopy.

Cited by 6 publications

References 23 publications

Effect of Normal Contact Vibration on Nano-Scale Friction

Effect of Normal Contact Vibration on Nano-Scale Friction

Comparative Study of Dimensionality and Symmetry Breaking on Nanoscale Friction in the Prandtl–Tomlinson Model with Varying Effective Stiffness

Pressure induced transformation of biomass to a highly durable, low friction film on steel

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