Tribological Properties of Carbon Nanopearls Synthesized by Nickel-Catalyzed Chemical Vapor Deposition

Hunter, Chad N.; Check, Michael H.; Hager, Carl H.; Voevodin, Andrey A.

doi:10.1007/s11249-008-9324-3

Cited by 20 publications

(10 citation statements)

References 28 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: 86%

“…3). This percentage friction reduction agrees broadly well with results of boundary friction experiments which used carbon nanopearls (larger, &150 nm layered nanoparticles) as a solid lubricant (&85 %) [22], as well as when CNO and CND are used as additives in a base oil (&50 %) [12,23]. The very low friction coefficients and zero wear observed at 0.44 and 1.00 coverage in these simulations have not been detected in boundary friction experiments of CNO and CND.…”

Section: Effect Of Nanoparticle Coveragesupporting

confidence: 86%

“…Specifically, CNO has been shown to reduce the friction coefficient by &85 % when used as a solid lubricant [22]. Friction coefficient reductions of &50 % have also been observed compared to a pure base oil when CNO [23] and CND [12] were used as additives.…”

Section: Introductionmentioning

confidence: 99%

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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: 86%

Section: Effect Of Nanoparticle Coveragesupporting

confidence: 86%

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

et al. 2016

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“…This contribution to the friction coefficient was well predicted by an expression developed for macroscopic indentation by Bowden and Tabor [271]. Even at the highest pressure and lowest coverage simulated, both types of nanoparticle were able to maintain separation of the opposing slabs and reduced friction by approximately 75% compared to when no nanoparticles were present, in agreement with experimental observations [272]. CNO nanoparticles showed a lower indentation (wear) depth and lower friction coefficients than CND nanoparticles at the same coverage and pressure, making them more attractive friction modifier additives.…”

Section: Nanoparticles As Dry Lubricantssupporting

confidence: 84%

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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“…Therefore, CNTs and graphene are also used as fillers in the base-lubricant materials to improve their friction and wear properties [18][19][20]. Polymer composites reinforced with CNTs [21][22][23][24][25] and graphene [26,27] have attracted much attention in research in the lubricating and mechanical properties. For instance, Men et al [28] reported the functionalization of CNTs to improve the tribological properties of poly(furfuryl alcohol) composite coatings, and the results showed that the functionalization led to an improvement in the tribological properties of composite coatings.…”

Section: Introductionmentioning

confidence: 99%

Preparation and tribological properties of graphene/poly(ether ether ketone) nanocomposites

Song

et al. 2012

J Mater Sci

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The tribological behavior of poly(ether ether ketone) (PEEK) composites was investigated using a universal micro-tribotester under dry friction conditions. We studied the effect of addition concentration, applied load, and sliding speed on the friction and wear behavior of composites filled with multi-walled carbon nanotubes (MWNTs), graphene oxide (GO) nanosheets, and c-aminopropyl trimethoxysilane-modified graphene oxide (GO-Si) nanosheets. The results showed that the friction reduction and anti-wear performance of PEEK composites filled with GO-Si is the most effective, that of the composites filled with GO is the next, while that of the composites filled with MWNTs is the worst. GO-Si-filled PEEK nanocomposites have the best friction reduction and anti-wear properties when the applied load and the sliding speed are 2.94 N and 0.0628 ms -1 , respectively. Furthermore, scanning electron microscope (SEM) investigation showed that GO-Si-filled PEEK composites had smooth worn surface under given applied load and sliding speed, and well-dispersed GO-Si in PEEK matrix provided a large surface area available for interaction between polymer molecules and GO-Si, which helped to reduce the wear of PEEK composites.

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Tribological Properties of Carbon Nanopearls Synthesized by Nickel-Catalyzed Chemical Vapor Deposition

Cited by 20 publications

References 28 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

Preparation and tribological properties of graphene/poly(ether ether ketone) nanocomposites

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