Boundary Lubrication Mechanisms for High-Performance Friction Modifiers

He, Xingyao; Lü, Jie; Desanker, Michael; Invergo, Anna Magdalene; Lohr, Tracy L.; Ren, Nanqi; Lockwood, Frances E.; Marks, Tobin J.; Chung, Yip‐Wah; Wang, Q Jane

doi:10.1021/acsami.8b11075

Cited by 22 publications

(12 citation statements)

References 54 publications

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“…In nanotribology, MD simulations have been applied to investigate atomic-scale friction, indentation, contact, wear, and lubricant design. For instance, MD simulations performed by He et al [684] have provided valuable information for design and synthesis of high-performance friction modifiers. However, this section will mostly concentrate on the wear-related simulations while the descriptions for simulations of atomic scale friction and other atomic processes could be found in corresponding Section 6.2.…”

Section: Simulationmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Section: Simulationmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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“…The authors pointed out that it was the heterocyclic structure and tailored side chains that led to the low friction. He et al 9 further investigated the structure−performance relations of heterocyclic additives with varying alkyl substituents. The lubrication mechanisms were discussed in detail based on friction tests and molecular dynamics simulation: enhanced ultrathin boundary lubrication films, improved adsorption stability, and favorable thermodynamic conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

Alkyl-Ethylene Amines as Effective Organic Friction Modifiers for the Boundary Lubrication Regime

Zeng

et al. 2020

Langmuir

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With the pursuit of fuel economy in the automotive industry, recently low-viscosity lubricant technology has been widely improved. The present work has systematically discussed a series of sulfur- and phosphorus-free organic friction modifiers (FMs)alkyl-ethylene aminesby alkyl substitution from ethylene amines with various nitrogen-atom numbers and molecular configurations. Herein, the pin-on-flat reciprocation friction tests have exhibited that the addition of the novel alkyl-ethylene amines into base oil led to significant reductions in the friction coefficient (up to 23%). Further investigations of tribological properties at elevated temperatures demonstrated that the increased number of nitrogen atoms and the regular linear atomic arrangement contributed to an improvement of friction reduction (up to 66%) compared to the neat base oil. Notably, results of water contact angle measurement and infrared spectroscopy (IR) have provided favorable evidence that the novel FMs have adsorbed on the metal surface leading to the formation of a tribofilm, whereby the tribofilm prevented the sliding surfaces from direct asperity contact and markedly improved the tribological performance, as seen from the composition analysis of the worn surfaces by an energy-dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), and confocal Raman spectroscopy. Therefore, the present work can provide a practical reference for molecular structure design through investigation of structure–performance relations of lubricant additives.

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“…By studying the density distribution of alkanes with different chain lengths, Zheng et al [ 13 ] pointed out that increasing the chain length helps to form a lubricating layer of a single molecular layer and makes the density peak increase. Thus, lubricating materials play a vital role in the characteristics of lubrication [ 14 , 15 , 16 , 17 , 18 ]. This research indicates that there are many factors that affect the lubrication characteristics of the film.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation on Thin-Film Lubrication of a Mixture of Three Alkanes

Zhang

et al. 2020

Materials

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We used the COMPASS forcefield to perform molecular dynamics (MD) simulation of a mixture composed of three alkanes as the lubricant for the thin-film lubrication. The viscosity of the lubrication film in the non-working state, the final film thickness, and density distribution were investigated. The results reveal that the viscosity error among different initial film thicknesses in the non-working state is within 5%, which confirms the applicability of the model and the forcefield. The viscosity decreases oscillating as temperature increases. Whatever the initial film thickness is, the film thickness change rate with respect to pressure load is almost the same. When pressure increases, the density peaks increase. As the initial film thickness increases, the normalized thicknesses of adsorption and ordered layers decrease. In nanoscale, the density predicted by the MD simulation is higher than the prediction of the Tait equation, even if the adsorption layers is excluded.

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Boundary Lubrication Mechanisms for High-Performance Friction Modifiers

Cited by 22 publications

References 54 publications

A review of recent advances in tribology

A review of recent advances in tribology

Alkyl-Ethylene Amines as Effective Organic Friction Modifiers for the Boundary Lubrication Regime

Molecular Dynamics Simulation on Thin-Film Lubrication of a Mixture of Three Alkanes

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