Physicochemistry aspects on frictional interfaces

Yu, Qiangliang; Zhou, Feng; Liu, Weimin

doi:10.1007/s40544-017-0191-5

Cited by 38 publications

(19 citation statements)

References 112 publications

(142 reference statements)

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“…In modern industry, reducing friction and wear plays a significant role in improving mechanical components' durability and efficiency. The oil-based lubricants are widely used in industries to make machines run more effectively (Cai et al , 2017). However, with the development of technology, the oil alone cannot meet the lubrication requirements of mechanical equipment under severe working conditions, such as heavy load, high speed and high temperature (Niu et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Highly dispersed dialkyl dithiophosphate-functionalized ZIF-8 particles as additives of the lubricating oil

Zhang

et al. 2022

ILT

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Purpose This paper aims to propose a new strategy to functionalize zeolitic imidazolate frameworks (ZIF-8) to improve its dispersion stability and tribological properties in lubricating oil. Design/methodology/approach Dialkyl dithiophosphate polydopamine ZIF-8 (DDP@PDA@ZIF-8) was prepared via mussel-inspired chemistry and the Michael addition reaction. The tribological properties of DDP@PDA@ZIF-8 as an additive in the white oil were evaluated with four-ball friction and wear tester at different temperatures. The worn surface was analyzed using X-ray photoelectron spectrum (XPS). Findings The as-prepared DDP@PDA@ZIF-8 shows high dispersion stability in the white oil. Tribological results confirmed that the DDP@PDA@ZIF-8 exhibited a small wear scar diameter at 25°C. However, excellent friction reduction and anti-wear properties were observed at 75°C. The XPS result indicates that a series of tribochemical reactions occurred on the worn surface, forming the complex protective film. Originality/value This paper provides a study of highly dispersed ZIF-8 as lubrication additives.

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Section: Introductionmentioning

confidence: 99%

Highly dispersed dialkyl dithiophosphate-functionalized ZIF-8 particles as additives of the lubricating oil

Zhang

et al. 2022

ILT

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“…These problems caused by friction are particularly important in nanometer-sized devices and machines because of the high surface-to-volume ratio of nanostructures. Two-dimensional (2D) materials [3][4][5], such as graphene [6] and molybdenum disulfide (MoS 2 ) [7,8] can considerably reduce the wear and friction in mechanical systems, owing to their chemical inertness [9][10][11][12], high strength [13], and peculiar structure [14]. For example, Kawai et al discovered ultra-low friction between graphene nanoribbons and an Au surface [15].…”

Section: Introductionmentioning

confidence: 99%

Superlubricity of molybdenum disulfide subjected to large compressive strains

Meng

Tao

et al. 2021

Friction

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The friction between a molybdenum disulphide (MoS2) nanoflake and a MoS2 substrate was analyzed using a modified Tomlinson model based on atomistic force fields. The calculations performed in the study suggest that large deformations in the substrate can induce a dramatic decrease in the friction between the nanoflake and the substrate to produce the so-called superlubricity. The coefficient of friction decreases by 1–4 orders of magnitude when a high strain exceeding 0.1 is applied. This friction reduction is strongly anisotropic. For example, the reduction is most pronounced in the compressive regime when the nanoflake slides along the zigzag crystalline direction of the substrate. In other sliding directions, the coefficient of friction will reduce to its lowest value either when a high tensile strain is applied along the zigzag direction or when a high compressive strain is applied along the armchair direction. This anisotropy is correlated with the atomic configurations of MoS2.

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“…It has been found that the lubricant employing ILs as additives in base oils boosts the lubricating efficiency and reduces the cost to increase their potential applicability at industrial scales [4,8,[17][18][19][20]. A phosphonium-based IL adding into the hydrocarbon oil with an IL concentration of 5 wt%, has demonstrated a significant reduction in the friction coefficient in steel-cast iron contacts [21].…”

Section: Introductionmentioning

confidence: 99%

Probing the nanofriction of non-halogenated phosphonium-based ionic liquid additives in glycol ether oil on titanium surface

et al. 2021

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The nanofrictional behavior of non-halogentated phosphonium-based ionic liquids (ILs) mixed with diethylene glycol dibutyl ether in the molar ratios of 1:10 and 1:70 was investigated on the titanium (Ti) substrate using atomic force microscopy (AFM). A significant reduction is observed in the friction coefficient μ for the IL-oil mixtures with a higher IL concentration (1:10, μ ∼ 0.05), compared to that for the lower concentration 1:70 (μ ∼ 0.1). AFM approaching force-distance curves and number density profiles for IL-oil mixtures with a higher concentration revealed that the IL preferred to accumulate at the surface forming IL-rich layered structures. The ordered IL-rich layers formed on the titanium surface facilitated the reduction of the nanoscale friction by preventing direct surface-to-surface contact. However, the ordered IL layers disappeared in the case of lower concentration, resulting in an incomplete boundary layers, because the ions were displaced by molecules of the oil during sliding and revealed to be less efficient in friction reduction.

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Physicochemistry aspects on frictional interfaces

Cited by 38 publications

References 112 publications

Highly dispersed dialkyl dithiophosphate-functionalized ZIF-8 particles as additives of the lubricating oil

Highly dispersed dialkyl dithiophosphate-functionalized ZIF-8 particles as additives of the lubricating oil

Superlubricity of molybdenum disulfide subjected to large compressive strains

Probing the nanofriction of non-halogenated phosphonium-based ionic liquid additives in glycol ether oil on titanium surface

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