Molecular dynamics investigation of the effect of copper nanoparticle on the solid contact between friction surfaces

Hu, Chengzhi; Bai, Ming; Lv, Jizu; Líu, Hao; Li, Xiaojie

doi:10.1016/j.apsusc.2014.10.006

Cited by 53 publications

(39 citation statements)

References 43 publications

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“…3) [32]. Here, the friction coefficient decreases [39,47] and converges to l & 1, which is comparable to the experimentally observed value for the dry sliding of steel surfaces [22,48], thus validating this surface model for the reproduction of experimental friction coefficients. Figure 4 shows the change in the friction behaviour when CNO and CND nanoparticles are present at various coverages when P z = 1.0 GPa.…”

Section: Effect Of Nanoparticle Coveragesupporting

confidence: 68%

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

et al. 2016

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For the successful development and application of novel lubricant additives, a full understanding of their tribological behaviour at the nanoscale is required, but this can be difficult to obtain experimentally. In this study, nonequilibrium molecular dynamics simulations are used to examine the friction and wear reduction mechanisms of promising carbon nanoparticle friction modifier additives. Specifically, the friction and wear behaviour of carbon nanodiamonds (CNDs) and carbon nano-onions (CNOs) confined between a-iron slabs is probed at a range of coverages, pressures, and sliding velocities. At high coverage and low pressure, the nanoparticles do not indent into the a-iron slabs during sliding, leading to zero wear and a low friction coefficient. At low coverage and high pressure, the nanoparticles indent into, and plough through the slabs during sliding, leading to atomic-scale wear and a much higher friction coefficient. This contribution to the friction coefficient is well predicted by an expression developed for macroscopic indentation by Bowden and Tabor. Even at the highest pressures and lowest coverages simulated, both nanoparticles were able to maintain separation of the opposing slabs and reduce friction by approximately 75 % compared to when no nanoparticle was present, which agrees well with experimental observations. CNO nanoparticles yielded a lower indentation (wear) depth and lower friction coefficients at equal coverage and pressure with respect to CND, making them more attractive friction modifier additives. Potential changes in behaviour on harder and softer surfaces are also discussed, together with the implications that these results have in terms of the application of the studied nanoparticles as lubricants additives.

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Section: Effect Of Nanoparticle Coveragesupporting

confidence: 68%

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

et al. 2016

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“…Hu et al [267] investigated the effect of soft metallic copper nanoparticles between relatively hard iron surfaces using NEMD simulations. The results suggested that the nanoparticles deformed to generate a low shear strength film between the contact surfaces, which accommodated the velocity gradient through plastic deformation.…”

Section: Nanoparticles As Dry Lubricantsmentioning

confidence: 99%

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

2018

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Nonequilibrium molecular dynamics (NEMD) simulations have provided unique insights into the nanoscale behaviour of lubricants under shear. This review discusses the early history of NEMD and its progression from a tool to corroborate theories of the liquid state, to an instrument that can directly evaluate important fluid properties, towards a potential design tool in tribology. The key methodological advances which have allowed this evolution are also highlighted. This is followed by a summary of bulk and confined NEMD simulations of liquid lubricants and lubricant additives, as they have progressed from simple atomic fluids to ever more complex, realistic molecules. The future outlook of NEMD in tribology, including the inclusion of chemical reactivity for additives, and coupling to continuum methods for large systems, is also briefly discussed.

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“…Hu et al [17] in an analytical work predicted friction properties of nanoparticles and investigated the effect of copper (Cu) nanoparticles on the solid contact between the friction surfaces by applying a molecular dynamics method to reveal the mechanisms responsible for the favorable friction properties of nanoparticles. Two models were built, which were named model A (without Cu) and model B (with Cu).…”

Section: Copper (Cu) and Copper Oxide (Cuo) Nanoparticle Additives Inmentioning

confidence: 99%

“…Copyright (2013) Springer. Effect of Cu nanoparticles on friction force/area with respect to sliding time at high velocity (A) and low velocity (B) by molecular dynamics method[17]. Reproduced with permission from Elsevier.…”

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confidence: 99%

Improving the tribological behavior of internal combustion engines via the addition of nanoparticles to engine oils

Ali¹,

Hou

2015

Nanotechnology Reviews

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The friction between two sliding surfaces is probably one of the oldest problems in mechanics. Frictional losses in any I.C. engine vary between 17% and 19% of the total indicated horse power. The performance of internal combustion engines in terms of frictional power loss, fuel consumption, oil consumption, and harmful exhaust emissions is closely related to the friction force and wear between moving parts of the engine such as piston assembly, valve train, and bearings. To solve this problem, most modern research in the area of Nanotribology (Nano lubricants) aims to improve surface properties, reduce frictional power losses, increase engine efficiency, and reduce consumed fuel and cost of maintenance. Nano lubricants contain different nanoparticles such as Cu, CuO, TiO 2 , Ag, Al 2 O 3 , diamond, and graphene oxide. This paper demonstrates the effect of nanoparticles on the tribological behavior of the engine oil. The main objective of this review is to present recent progress and, consequently, develop an exhaustive understanding about the tribological behavior of engine oils mixed with nanoparticles.

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Molecular dynamics investigation of the effect of copper nanoparticle on the solid contact between friction surfaces

Cited by 53 publications

References 43 publications

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

Improving the tribological behavior of internal combustion engines via the addition of nanoparticles to engine oils

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