Friction-Induced Transformation from Graphite Dispersed in Esterified Bio-Oil to Graphene

Xu, Yufu; Geng, Jian; Zheng, Xiaotong; Dearn, Karl D.; Hu, Xianguo

doi:10.1007/s11249-016-0708-5

Cited by 17 publications

(15 citation statements)

References 53 publications

(50 reference statements)

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“…Persson [12] said that the mix of particles with water is highly viscous and then lubricates more the tire/road interface. The lubricating action of particles mixed with lubricants has been observed in other tribosystems like piston ring-cylinder liner pairs in internal combustion engines [13][14] [15]. These authors have shown that adding additives like molybdenum disulfide [13] [14] or graphite [15] in oils helps to reduce friction and wear.…”

Section: Introductionmentioning

confidence: 99%

“…The lubricating action of particles mixed with lubricants has been observed in other tribosystems like piston ring-cylinder liner pairs in internal combustion engines [13][14] [15]. These authors have shown that adding additives like molybdenum disulfide [13] [14] or graphite [15] in oils helps to reduce friction and wear. Xu and coauthors in [15] attributed this performance to the higher viscosity of oil with additives (an esterified bio-oil has been used) compared with pure oil.…”

Section: Introductionmentioning

confidence: 99%

“…These authors have shown that adding additives like molybdenum disulfide [13] [14] or graphite [15] in oils helps to reduce friction and wear. Xu and coauthors in [15] attributed this performance to the higher viscosity of oil with additives (an esterified bio-oil has been used) compared with pure oil. This observation corroborates that made by Persson in [12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of dry deposited particles on the tire/road friction

Hichri¹,

Cerezo²,

Do³

2017

Wear

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Road accidents increase during the first rain after a long dry period. It is widely accepted that the tire traction loss is due to fine particles accumulated on the road surface. Yet, the involved mechanisms at the tire/road interface are not clearly understood. This paper deals with the particle-induced lubrication on dry road. Tests are performed in laboratory. Sediments are extracted from a catchment area which collects runoff water. The process of extracting particles from sediments in laboratory by drying and sieving is described. Particles are separated into fractions characterized by their chemical composition and size distribution. Protocol to simulate the process of particles' build-up on the road surface is described. The effect of the particle's size and concentration is studied. Surfaces representative of real road surface textures are tested. Friction tests are conducted using the Skid Resistance Tester, which is widely used to assess friction characteristics of road surfaces. Samples are weighed before and after each friction run. On a surface initially covered by a compacted particle layer, successive friction runs are performed, without resupplying particles, to follow the evolution of the friction coefficient with the particle depletion. Friction drops significantly when a surface is covered by particles. Successive runs induce an increase of the friction coefficient until reaching a stable value which is still lower than that of a clean surface. Particles are considered as third bodies introduced artificially in the interface between the friction slider and the test sample. Analysis of particles' flows (particles trapped and ejected), through particles' mass extracted from weighing, helps to explain the friction variation. Assuming that friction is governed by the surface fraction (X) covered by particles, a model was developed. The calculated friction coefficient is a weighted sum of friction coefficients when the surface is respectively clean (X = 0) and fully covered by particles (X = 1). It was found that the surface fraction can be expressed as a function of the ratio of available particles' mass to initial particles' mass. Comparisons between model and experiment are satisfactory. Discussions are made in terms of interactions between surface textures and particles' size and concentration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of dry deposited particles on the tire/road friction

Hichri¹,

Cerezo²,

Do³

2017

Wear

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“…Recently, in order to improve the yield of production of single layer graphene, Xu et al [72] used a friction-induced exfoliation from graphite to graphene in esterified bio-oil. They dispersed flake graphite into the esterified bio-oil and then measured the tribological response of the dispersed graphene after ultrasonication for 20 min.…”

Section: Modified Mechanical Exfoliationmentioning

confidence: 99%

Nano-MoS2 and Graphene Additives in Oil for Tribological Applications

Peng

You

et al. 2017

Nanotechnology in Oil and Gas Industries

Self Cite

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Nano-additives have attracted lots of attentions in recent years due to their special performances. A traditional lubricating additive MoS 2 with nano-scale and a novel additive graphene were reviewed in this chapter. The synthesis methods, properties and tribological applications of these two kinds of nano-additives dispersed in media have been reported. Nano-MoS 2 has three main nanostructures including nanoball particles, nano-sheets and nano-tubes. The wide accepted lubricating mechanisms for the MoS 2 nano-balls, nano-sheets and nano-tubes are nano-bearing effects, slippery roles and combined actions of rolling and sliding, respectively. Exfoliation and transfer seems to be the main pattern for MoS 2 nano-balls. For graphene, the adsorption and tribo-reaction account for its lubricating properties. A synergistic lubricating

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“…In order to better understand the tribological properties of α-ZrP, we selected MoS 2 and graphite as the reference in this research. Because MoS 2 and graphite are the conventional solid lubricant, which are usually used as additives in calcium grease [16][17][18][19]. The tribological performance of α-ZrP, MoS 2 , and graphite anhydrous calcium grease was evaluated at different applied loads, frequencies, temperatures, and durations.…”

Section: Introductionmentioning

confidence: 99%

Tribological Investigation of Layered Zirconium Phosphate in Anhydrous Calcium Grease

et al. 2017

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The tribological properties of α-zirconium phosphate particles as an additive in anhydrous calcium grease were studied by using an Optimol SRV-V oscillating reciprocating tester and a four-ball tester. Fortunately, α-Zr(HPO 4)•H 2 O (α-ZrP) grease exhibits excellent properties in anti-friction and wear-resistant, load-carrying capacity, and extreme pressure properties. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and 3D analysis show that α-ZrP particles appear to form a protective film allowing increased load capacity and operating frequency of the rubbed pairs. Meanwhile, α-ZrP particles can provide low friction coefficient and wear loss during a long-term test.

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Friction-Induced Transformation from Graphite Dispersed in Esterified Bio-Oil to Graphene

Cited by 17 publications

References 53 publications

Effect of dry deposited particles on the tire/road friction

Effect of dry deposited particles on the tire/road friction

Nano-MoS2 and Graphene Additives in Oil for Tribological Applications

Tribological Investigation of Layered Zirconium Phosphate in Anhydrous Calcium Grease

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