Selective release of less defective graphene during sliding of an incompletely reduced graphene oxide coating on steel

Xu, Shusheng; Liu, Yuzhen; Gao, Mingyu; Kang, Kyeong-Hee; Kim, Chang-Lae; Kim, Dae Eun

doi:10.1016/j.carbon.2018.04.022

Cited by 21 publications

(6 citation statements)

References 45 publications

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“…The C 1s XPS spectrum of the Mn 3 O 4 @G (Supporting Information, Figure S3) has three peaks corresponding to the chemical bands of C/CC (284.7 eV), CO (286.35 eV), and CO/HOCO (288.7 eV), respectively . The intensity of the C 1s peak of the CC/CC band is much higher than that of carbons binding to oxygens.…”

Section: Resultsmentioning

confidence: 99%

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn₃O₄/Graphene as Lubricant Additives

Zhao

et al. 2019

ACS Appl. Mater. Interfaces

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Nanoparticles and two-dimensional (2D) nanosheets are well-investigated as lubricant additives, which can significantly reduce frictional energy consumption. However, the tribological properties of the additives will deteriorate because of the occurrence of aggregation in the lubricant and the difficulty in entering the frictional contact area. In the present work, the new sandwichlike nanostructure of Mn3O4 nanoparticles and graphene nanosheets (Mn3O4@G) has been developed by an in situ green synthesis method; i.e., the impurities of Mn2+ ions in crude graphite oxide as the precursor are directly transferred into Mn3O4 precipitate between the graphene sheets. The graphene has a lamellar structure without folds and wrinkles, and the Mn3O4 nanoparticles are not only uniformly anchored on the graphene surfaces but also intercalated in the layers of the graphene nanosheets. The Mn3O4@G exhibits excellent tribological properties and high stability because of a synergistic lubrication effect between the graphene nanosheets and the Mn3O4 nanoparticles. Even at an ultralow concentration (0.075 wt %) and a high temperature of 125 °C, the friction coefficient and the wear depth have been reduced by 75% and 97% compared with base oil, respectively. The synthesis method and the Mn3O4@G nanocomposite have significant potential in various tribological applications for saving energy.

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Section: Resultsmentioning

confidence: 99%

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn₃O₄/Graphene as Lubricant Additives

Zhao

et al. 2019

ACS Appl. Mater. Interfaces

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“…For instance, in polymethyl methacrylate counterparts, the average COFs of graphene, 2D Ti 3 C 2 , and MG binary coating are 0.28 ± 0.059, 0.43 ± 0.087, and 0.21 ± 0.015, respectively. The composite system can infinitely reduce the friction of single 2D material and improve the friction stability during sliding . Among the six polymer counterparts, the PTFE ball displays the brilliant effect on weakening friction.…”

Section: Resultsmentioning

confidence: 99%

“…The composite system can infinitely reduce the friction of single 2D material and improve the friction stability during sliding. [37][38][39] Among the six polymer counterparts, the PTFE ball displays the brilliant effect on weakening friction. The average COF is below 0.2.…”

Section: Basic Mechanical Performancesmentioning

confidence: 99%

Interfacial Nanostructure of 2D Ti₃C₂/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear

et al. 2020

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The 2D Ti 3 C 2 /graphene quantum dots (GQDs) composite coating contains numerous merits, which offers underlying solutions for lubrication issues in common conditions. Herein, specific efforts are devoted to explore and develop the antiwear interfacial performances of 2D Ti 3 C 2 /GQDs hybrid multicoating in common environment. In addition, combination with nanodiamond would impose significant effects on improving lubricity of binary composite coating to obtain long-durability ternary composite coating. Meanwhile, macroscale and atomicscale characterizations are utilized to detect the lubrication behavior of binary and ternary composite coating to illuminate the influence of compositions on the establishment of ultralow-wear interfaces on slip process. These testing results highlight an outspread lubrication mechanism for 2D Ti 3 C 2 /GQDs hybrid multicoating. They suggest that 2D Ti 3 C 2 /GQDs and 2D Ti 3 C 2 /nanodiamond/ GQDs composite coating exhibit ultralow wear with rubbing against polytetrafluoroethylene ball. A newly nanostructured tribofilm is formed on the sliding contact. Also the 2D Ti 3 C 2 /nanodiamond/GQDs ternary coating has longdurability and ultralow-wear during sliding for a long time.

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“…Problems related to friction and wear due to the relative sliding motion in the contact areas of the driving parts of mechanical equipment are increasing in the machine and material field. Due to friction/wear problems have a large impact on the efficiency, reliability, and durability of the system, lubricants or wear-resistant coatings are generally used to reduce the friction and protect the original material surface [1,2,3,4,5]. Various studies have been conducted to reduce friction and wear phenomena in the contact area and the degree of the improvement of the friction properties is evaluated using diverse methods [6,7,8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Design of a Tribotester Based on Non-Contact Displacement Measurements

Kim

Sung

2019

Micromachines

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A tribotester with an integrated load sensor based on a strain gauge is typically used to measure the friction coefficient generated by the contact-related sliding motion of two objects. Since the friction coefficient is obtained by dividing the measured friction force by the applied normal force, the normal and friction forces must be measured for accurate analysis. In this study, a tribotester was used to measure the displacement of a cantilever tip using the fiberoptic sensor in a non-contact method. The friction coefficient measurement using the fiberoptic sensor was proven to be valid by calibrating the tip displacement due to normal/friction forces after designing a basic structural cantilever tip based on experiments and simulation analyses. The results obtained by using the fiberoptic sensor-cantilever tip-based tribotester were compared with those obtained using commercial and/or custom-built tribotesters under the same conditions. By designing various shapes of cantilever tips and using simulation analysis, the calibrations of the normal/friction forces and tip displacement could be verified and the coupling effect was evaluated. The performance and reliability of the fiberoptic sensor-cantilever tip-based tribotester, which can be used to determine the normal/friction forces by non-contact displacement measurements without a strain gauge, were verified.

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Selective release of less defective graphene during sliding of an incompletely reduced graphene oxide coating on steel

Cited by 21 publications

References 45 publications

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn₃O₄/Graphene as Lubricant Additives

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn₃O₄/Graphene as Lubricant Additives

Interfacial Nanostructure of 2D Ti₃C₂/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear

Design of a Tribotester Based on Non-Contact Displacement Measurements

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Selective release of less defective graphene during sliding of an incompletely reduced graphene oxide coating on steel

Cited by 21 publications

References 45 publications

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn3O4/Graphene as Lubricant Additives

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn3O4/Graphene as Lubricant Additives

Interfacial Nanostructure of 2D Ti3C2/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear

Design of a Tribotester Based on Non-Contact Displacement Measurements

Contact Info

Product

Resources

About

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn₃O₄/Graphene as Lubricant Additives

In Situ Green Synthesis of the New Sandwichlike Nanostructure of Mn₃O₄/Graphene as Lubricant Additives

Interfacial Nanostructure of 2D Ti₃C₂/Graphene Quantum Dots Hybrid Multicoating for Ultralow Wear