Self-Assembled Graphene Film as Low Friction Solid Lubricant in Macroscale Contact

Wu, Pu; Li, Xinming; Zhang, Chenhui; Chen, Xinchun; Lin, Shuyuan; Sun, Hongyan; Lin, Cheng‐Te; Zhu, Hongwei; Luo, Jianbin

doi:10.1021/acsami.7b04599

Cited by 108 publications

(48 citation statements)

References 45 publications

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“…They concluded that nanoscrolls slide on a diamondlike carbon surface at which incommensurate contact occurs, thereby reducing the friction coefficient. Wu et al [62] developed a lubricating system in which a self-assembled graphene film (SGF) slides against an SGF under macroscale contact. Ultra-low friction was discovered owing to the low resistance to shear between the adjacent layers of SGFs.…”

Section: Interlaminar Friction In Homogeneous and Heterogeneous Slidimentioning

confidence: 99%

Recent advances in friction and lubrication of graphene and other 2D materials: Mechanisms and applications

et al. 2019

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Two-dimensional materials having a layered structure comprise a monolayer or multilayers of atomic thickness and ultra-low shear strength. Their high specific surface area, in-plane strength, weak layer-layer interaction, and surface chemical stability result in remarkably low friction and wear-resisting properties. Thus, 2D materials have attracted considerable attention. In recent years, great advances have been made in the scientific research and industrial applications of anti-friction, anti-wear, and lubrication of 2D materials. In this article, the basic nanoscale friction mechanisms of 2D materials including interfacial friction and surface friction mechanisms are summarized. This paper also includes a review of reports on lubrication mechanisms based on the film-formation, self-healing, and ball bearing mechanisms and applications based on lubricant additives, nanoscale lubricating films, and space lubrication materials of 2D materials in detail. Finally, the challenges and potential applications of 2D materials in the field of lubrication were also presented.

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Section: Interlaminar Friction In Homogeneous and Heterogeneous Slidimentioning

confidence: 99%

Recent advances in friction and lubrication of graphene and other 2D materials: Mechanisms and applications

et al. 2019

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“…Some studies [17][18][19] explored the sliding behaviour of graphene nanoflakes on a graphene surface at the microscale level using scanning tunnelling microscopy, finding a superlubric state of graphene at low temperatures [20]. Many other studies [21][22][23][24][25][26][27][28][29][30] reported that graphene sheets exhibited excellent macroscale tribological properties on various surfaces of friction pairs, such as silicon-like substrates [21][22][23][24], mica [25], iron [26], copper [27,28], and steel [29,30].…”

Section: Introductionmentioning

confidence: 99%

Effects of Thickness and Particle Size on Tribological Properties of Graphene as Lubricant Additive

Kong

Wang

et al. 2020

Tribol Lett

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Increasing studies have demonstrated excellent tribological properties of graphene as lubricant additive. Thus, extended explanations of the relationship between microstructure and tribological properties are needed. This paper reported the effects of thickness and particle size of graphene on its frictional performance, using a ball-on-plate tribotester under reciprocating condition. Graphene with few-layer (G2) or multi-layer (G10) structure was added to PAO4 as lubricant additive. The particle of G10 was further separated through centrifugation into two types, large size G10 (G10L) and small size G10 (G10S). G10S exhibits excellent reduction in friction (37%) and wear (47%) relative to the neat base oil, indicating the superior tribological properties of graphene with more layers and smaller particle size. Wear scar analysis shows that the surface lubricated with G10 is flatter and glossier than that of G2. It can be hypothesized that the interlaminar shear slip is more likely to occur in multi-layer graphene, leading to better friction reduction and wear resistance performance. Graphene with smaller particle size is not only less prone to structural defects and wrinkles, but also more easily adsorbed onto the sliding surface to form a lubricating film, providing enhanced wear and frictional performance. The present work suggests that the thickness and size may have direct influence on the tribological properties of graphene, providing theoretical and experimental guidance for the application of graphene as lubricant additive.

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“…Graphene, a layered material composed of carbon atoms structured on a hexagonal lattice, has attracted much attention in the scientific community 1 , being a candidate for the fabrication of electronic devices 2 , gas sensors 3 as well as micro- and nano-electromechanical systems (MEMS and NEMS, respectively) 4,5 . Although the tribological properties of graphene have not yet been fully understood, the usage of graphene as both solid lubricant and coating has been proposed 6–10 . Studying friction in graphene becomes even more relevant as tribological properties of nanoscale materials might differ considerably from their bulk counterparts 11 , presenting novel and unexpected features.…”

Section: Introductionmentioning

confidence: 99%

Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene

Ptak

Almeida

Prioli

2019

Sci Rep

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The influence of sliding speed in the nanoscale friction forces between a silicon tip and monolayer and multilayer graphene were investigated with the use of an atomic force microscope. We found that the friction forces increase linearly with the logarithm of the sliding speed in a highly layer-dependent way. The increase in friction forces with velocity is amplified at the monolayer. The amplification of the friction forces with velocity results from the introduction of additional corrugation in the interaction potential driven by the tip movement. This effect can be interpreted as a manifestation of local thermally induced surface corrugations in nanoscale influencing the hopping dynamics of the atoms at the contact. These experimental observations were explained by modeling the friction forces with the thermally activated Prandtl-Tomlinson model. The model allowed determination of the interaction potential between tip and graphene, critical forces, and attempt frequencies of slip events. The latter was observed to be dominated by the effective contact stiffness and independent of the number of layers.

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Self-Assembled Graphene Film as Low Friction Solid Lubricant in Macroscale Contact

Cited by 108 publications

References 45 publications

Recent advances in friction and lubrication of graphene and other 2D materials: Mechanisms and applications

Recent advances in friction and lubrication of graphene and other 2D materials: Mechanisms and applications

Effects of Thickness and Particle Size on Tribological Properties of Graphene as Lubricant Additive

Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene

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