In-situ exfoliated graphene for high-performance water-based lubricants

Liang, Shuaishuai; Shen, Zhigang; Yi, Min; Liu, Lei; Zhang, Xiaojing; Ma, Shulin

doi:10.1016/j.carbon.2015.10.077

Cited by 180 publications

(73 citation statements)

References 37 publications

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“…[1,2] It can be used as solid, atomic-thick coating or as colloidal liquid lubricant. Its high strength, chemical stability and easy shear capability make it very appealing for a wide range of tribological applications, as revealed by the increasing number of experimental [3][4][5][6][7][8][9][10][11][12][13][14][15] and theoretical studies[16-28] on graphene friction. Recent experimental findings, in particular, revealed that graphene posses a great potential as solid lubricant not only for nano-scale, but also for macro-scale applications.…”

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confidence: 99%

Tribochemistry of graphene on iron and its possible role in lubrication of steel

Restuccia

Righi

2016

Carbon

114

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Recent tribological experiments revealed that graphene is able to lubricate macroscale steelon-steel sliding contacts very effectively both in dry and humid conditions. This effect has been attributed to a mechanical action of graphene related to its load-carrying capacity.Here we provide further insight into the functionality of graphene as lubricant by analysing its tribochemical action. By means of first principles calculations we show that graphene binds strongly to native iron surfaces highly reducing their surface energy. Thanks to a passivating effect, the metal surfaces coated by graphene become almost inert and present very low adhesion and shear strength when mated in a sliding contact. We generalize the result by establishing a connection between the tribological and the electronic properties of interfaces, which is relevant to understand the fundamental nature of frictional forces.

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confidence: 99%

Tribochemistry of graphene on iron and its possible role in lubrication of steel

Restuccia

Righi

2016

Carbon

114

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“…While the majority of the research at the nanoscale investigates the properties of graphene as a solid atomic-thick coating [22][23][24][25][26][27][28][29] at the macroscale graphene is studied also as colloidal liquid lubricant [30][31][32][33][34][35][36][37]. In few recent works, Berman et al successfully used graphene to lubricate a steel-steel sliding contact [31,32,42,43].…”

Section: Introductionmentioning

confidence: 99%

Surface passivation by graphene in the lubrication of iron: A comparison with bronze

Marchetto

Restuccia

Ballestrazzi

et al. 2017

Carbon

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It has been recently reported that graphene is able to significantly reduce the friction coefficient of steel-on-steel sliding contacts. The microscopic origin of this behavior has been attributed to the mechanical action of load carrying capacity. However, a recent work highlighted the importance of the chemical action of graphene. According to this work graphene reduces the adhesion of iron interfaces by reducing the surface energy thanks to a passivation effect. The aim of the present work is to clarify the still debated lubricating behavior of graphene flakes. We perform pin-on-disc experiments using liquid dispersed graphene solution as a lubricant. Two different materials, pure iron and bronze are tested against 100Cr6 steel. Raman spectroscopy is used to analyze the surfaces after the friction tests. The results of these tests prove that graphene flakes have a beneficial effect on the friction coefficient. At the same time they show a tendency of graphene to passivate the native iron surfaces that are exposed during sliding as a consequence of wear

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“…Meanwhile, it can be easily observed that the worn scar of the steel ball is coated by a layer of transferred materials, and, at the same time, a large amount of wear debris gathered on the side of the wear scar of the IL/0.3G. In most cases, wear scar diameter (WSD) has been used to estimate to wear behaviors of the lubricants, and, from the WSD, the wear volume (V) can be determined by the relations as follows [28,29] by:…”

Section: Resultsmentioning

confidence: 99%

Insight into the Effect of TDMs on the Tribological Behaviors of the Ionic Liquid Composite Films

Zhang

Wang

2020

Materials

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Ionic liquid (IL) combined with 2D materials has evoked considerable attention in the field of lubrication applications because of their speical structure and outstanding lubrication properties. However, the ambiguous effect of the 2D materials on the friction and anti-wear properties of the IL needs futher study. Here, we have obtained two families of IL composite films with additives of MoS 2 and graphene via a combined process of spin-coated and curing, and the distinction of the effects of two additives on the tribological performance of the IL films was studied. The friction tests showed that the friction coefficient and anti-wear life of the IL films were greatly enhanced after the addition of MoS 2 or graphene, which could be attributed to the improved load-carrying capacity and the second lubrication phase. Under a low addition content, graphene had more advantages to reduce the friction of the films, and MoS 2 was more beneficial to the tribological properties with the additional content increased. The films with low friction and good anti-wear properties may be valuable for the rational design of lubrication films for the practical engineering applications.

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In-situ exfoliated graphene for high-performance water-based lubricants

Cited by 180 publications

References 37 publications

Tribochemistry of graphene on iron and its possible role in lubrication of steel

Tribochemistry of graphene on iron and its possible role in lubrication of steel

Surface passivation by graphene in the lubrication of iron: A comparison with bronze

Insight into the Effect of TDMs on the Tribological Behaviors of the Ionic Liquid Composite Films

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