Tribological effects of fullerene (C60) nanoparticles added in mineral lubricants according to its viscosity

Ku, Bon‐Cheol; Han, Yeongcheol; Lee, Jung-Eun; Lee, Jae-Keun; Park, Sang-Ho; Hwang, Yujin

doi:10.1007/s12541-010-0070-8

Cited by 96 publications

(31 citation statements)

References 12 publications

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“…Although C 60 fullerene additives have been shown to reduce friction and wear under specific conditions [3][4][5][6], their action as molecular ball bearings has been widely disputed [7,8] and their overall performance as potential lubricant additives has been somewhat disappointing [1,7,8]. However, larger carbon nanoparticle additives have shown more promise with regard to boundary friction and wear reduction, specifically carbon nanodiamonds (CND) and carbon nanoonions (CNO) [1].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…Using a disc-on-disc tribometer, Lee et al [4] and Ku et al [5] employed fullerence (C60) nanoparticles added to mineral oils to investigate their tribological performance. Ku et al [5] used a volume fraction of 0.1%, whilst Lee et al [4] changed the volume fraction from 0.01% to 0.5%.…”

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confidence: 99%

“…Ku et al [5] used a volume fraction of 0.1%, whilst Lee et al [4] changed the volume fraction from 0.01% to 0.5%. They showed their results for coefficient of friction in the form of Stribeck curves.…”

mentioning

confidence: 99%

“…Lee et al [4] found that the volume fraction (VF) of fullerence was an important factor in reducing the coefficient of friction, whilst Ku et al [5] observed a more effective nanoparticle performance with lower viscosity base oils. Furthermore, using a disc-on-disc tribometer, Lee et al [6] produced Stribeck curves to study the performance of graphite nano-lubricants.…”

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confidence: 99%

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Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Shahmohamadi

Rahmani

Rahnejat

et al. 2017

Tribology International

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“…Lee et al [11] are premeditated the tribological features of graphite nano lubricants. Other nanoparticle with various capping agent, shapes, base liquid, size such as multi-walled carbon nanotubes [12] fullerene nanoparticle [13][14][15] Cu nanoparticle [16] composite nanoparticles [17], Nano-Diamond nanoparticles [18] recommends that the nano-particles dissolved in various lubricant oil presented the starring part in the augmentation of lubrication [19].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers

Jamalabadi

2017

IJET

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Abstract. The aim of this paper is numerical analysis of plain journal bearing with Nano particle added lubricating oil. The fluid film bearing is studied with the modified Reynolds equation which considered time dependent inertia effects at rotating speeds with the linearized turbulence. The research is performed for numerous nano-fluids include nanoparticles of CuO, TiO 2 , Ag and Cu and SAE 20W50 as a base fluid. The time transient governing equations include the incompressible mass conservation equation, Navier-Stokes momentum equations for thin film lubrication, and full kinematic including shaft accelerations are solved numerically. Two cases of long and short bearings are studied with Sommerfeld and Gumbel boundary conditions. Linearized force coefficients such as mass, stiffness and damping factors are obtained for an ordinary journal bearing. The ordinary plain journal bearing velocity response and the rotor displacements when sudden forces applied by rigid rotor symmetrically is achieved. The results prove that using the nanoparticle enhanced lubricant causes higher mass coefficients, damping ratios and fluid effective stiffness.

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Tribological effects of fullerene (C60) nanoparticles added in mineral lubricants according to its viscosity

Cited by 96 publications

References 12 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

Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers

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