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

Ewen, James P.; Gattinoni, Chiara; Thakkar, Foram M.; Morgan, Neal; Spikes, H. A.; Dini, Daniele

doi:10.1007/s11249-016-0722-7

Cited by 51 publications

(52 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When dispersed in a lubricant, nanoparticles can modify the lubricant viscosity and potentially also the flow behaviour [256]. Under boundary lubrication conditions, when surfaces come into direct contact, several mechanisms have been proposed for friction and wear by nanoparticles including [257] sliding (a), rolling (b), exfoliation (c), polishing (d), and mending (e), as shown in Fig. 6.…”

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

“…If nanoparticles are able to maintain the separation of surface asperities under boundary conditions they could give large reductions in friction and wear [257]. This requires nanoparticles to be sufficiently hard to not be plastically deformed under high contact pressures.…”

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

“…The prevalence of each of these mechanisms is expected to be highly situation-specific [219], and depend on variables including the material, size, shape, hardness, and coverage of the nanoparticle as well as the temperature, pressure, and sliding velocity [257]. For example, in-situ high resolution scanning/ transmission electron microscope (HRSEM/HRTEM) [262,263] images of inorganic fullerene (MoS 2 ) nanoparticles during sliding have suggested that their friction reduction mechanism consists of a mixture of sliding/rolling at low pressure and exfoliation to lamellar sheets of MoS 2 at high pressure.…”

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

“…This means that only the viscosity/flow modification of the nanoparticles, rather than their boundary friction reduction mechanisms (Fig. 6) can be probed [257]. Therefore, most NEMD studies have studied nanoparticles confined between solid surfaces in the absence of a lubricant, even though they are designed as additives (Section 3.2.1), although some studies have also been performed with nanoparticles dispersed in a lubricant (Section 3.2.2).…”

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

“…Ewen et al [257] used NEMD simulations to examine the friction and wear reducing mechanisms of carbon nanoparticles. Specifically, the friction and wear behaviour of carbon nanodiamonds (CNDs) and carbon nano-onions (CNOs) with a diameter of approximately 3 nm, confined between iron slabs was probed at a range of coverages, pressures, and sliding velocities.…”

Section: Nanoparticles As Dry Lubricantsmentioning

confidence: 99%

See 4 more Smart Citations

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

2018

View full text Add to dashboard Cite

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.

show abstract

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

Section: Nanoparticle Friction Modifiersmentioning

confidence: 99%

Section: Nanoparticles As Dry Lubricantsmentioning

confidence: 99%

See 3 more Smart Citations

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

2018

View full text Add to dashboard Cite

show abstract

Water‐based Cu nanofluid as lubricant for steel hot rolling: Experimental investigation and molecular dynamics simulation

Sun

Yang

et al. 2021

Lubrication Science

View full text Add to dashboard Cite

The lubrication performance of Cu nanofluid was studied through hot rolling tests and non‐equilibrium molecular dynamics simulation. Results showed that nanofluid with 0.5 wt% Cu nanoparticles possessed the optimal effect in reducing the rolling force, finish rolling thickness and rolled surface roughness. The superior lubrication performance was attributed to the formation of protective tribofilm made of Fe/Cu debris, iron and copper oxides as well as amorphous substances with a thickness of about 24 nm, which avoided the direct contact of steel strip and the roll, thus inhibiting the adhesion wear. Molecular dynamics simulation disclosed that the rolling‐dominated motion pattern of Cu nanoparticles with 74.1% rolling and 25.9% sliding motion contributed to a significant decrease in the friction force. Besides, surface defects including the peaks and valleys were polished and repaired by nanoparticles respectively, thus developing the surface quality of hot rolled products.

show abstract

Nanoparticles encapsulated carbon nanotubes dispersed lubricants for enhanced tribology through particle‐phase variation

Ranjan,

Kamaraj,

Ramaprabhu

2023

Lubrication Science

View full text Add to dashboard Cite

Nanostructures as an inert additive to the lubricant act as a tiny friction reduction element by providing asperity filling, polishing, and film formation mechanism at the nanoscale dimension under the boundary layer regime. Here, we explore the synthesis and tribology application of iron‐carbon‐based nanoparticles encapsulated multiwall carbon nanotubes (Fe‐C‐CNTs). Three Fe‐C nanoparticles phase that is, Fe3C‐CNTs, Fe3C‐Fe‐CNTs, and Fe‐CNTs are synthesised. In particular, the emphasis here is on the effect of nanoparticle phase variation on the tribology property. The tribology property of the prepared nanomaterials is studied by dispersing it in commercially used Servo gearbox oil. The coefficient of friction and wear is found reduced in all dispersions compared to the base gearbox oil confirming the manifestation of nanoscale mechanisms at the tribo‐interface. It is revealed that the phase variation shows more impact on the alteration of friction coefficient compared to the dispersion concentration variation analysed using ANOVA two‐way technique. Further, the diameter and composition analysis of the wear scar is used to comprehend the underlying mechanism of the encapsulated particle phase variation. The findings suggest that the Fe‐CNTs dispersions are efficient in reducing friction to a larger extent but also promote the interface oxidation leading to enhanced wear and roughness whereas, Fe3C‐CNTs and Fe3C‐Fe‐CNTs are chemically stable providing smooth sliding and less wear.

show abstract

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

Cited by 51 publications

References 58 publications

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

Water‐based Cu nanofluid as lubricant for steel hot rolling: Experimental investigation and molecular dynamics simulation

Nanoparticles encapsulated carbon nanotubes dispersed lubricants for enhanced tribology through particle‐phase variation

Contact Info

Product

Resources

About