Journal Article10.1021/ACSAMI.0C01515
Macroscale Superlubricity Achieved on the Hydrophobic Graphene Coating with Glycerol.
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TL;DR: A new strategy to overcome this limitation, involving the formation of a graphene coating with deposited graphene-family nanoflakes, followed by the lubrication of the coating with glycerol solution is proposed, which exhibited better lubrication and anti-wear performance than FG and GO coatings.
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Abstract: Introduction of graphene-family nanoflakes in liquid results in a reduction in friction and enhanced wear resistance. However, the high demand for dispersity and stability of the nanoflakes in liquid largely restricted the choice of graphene-family nanoflakes thus far. This study proposed a new strategy to overcome this limitation, involving the formation of a graphene coating with deposited graphene-family nanoflakes, followed by the lubrication of the coating with glycerol solution. Pristine graphene (PG), fluorinated graphene (FG), and graphene oxide (GO) nanoflakes were chosen to be deposited on the respective SiO2 substrates to form graphene coatings, and then an aqueous solution of glycerol was used as lubricant. The coefficient of friction (COF) and wear rate were reduced for all deposited coatings. However, the PG coating exhibited better lubrication and antiwear performance than FG and GO coatings. A robust superlubricity with COF of approximately 0.004 can be achieved by combining glycerol with the PG coating. The superlubricity mechanism was attributed to the formation of a tribofilm, mainly composed of graphene nanoflakes in the contact zone. The extremely low friction achieved on the hydrophobic graphene coating with liquid can aid in the development of a high-performing new lubrication system for industrial applications.
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Citations
Achieving macroscale superlubricity with ultra-short running-in period by using polyethylene glycol-tannic acid complex green lubricant
Changhe Du,Tong Yu,Zishuai Wu,Liqiang Zhang,Ruilin Shen,Xiaojuan Li,Min Feng,Yan Feng,Daoai Wang +8 more
TL;DR: A polyethylene glycol-tannic acid complex green liquid lubricant (PEG10000-TA) was designed to achieve macroscale superlubricity with an ultrashort running-in period of 9 s under a contact pressure of up to 410 MPa, and the wear rate was only 1.19 × 10 −8 mm 3 ·N −1 ·m −1 .
A critical review on liquid superlubricitive technology for attaining ultra-low friction
TL;DR: In this paper , a state-of-the-art review on various aspects of superlubricitive technology including recent progress in solid super-lubricity to achieve ultra-low friction have been presented.
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3D-Printed Topological MoS2/MoSe2 Heterostructures for Macroscale Superlubricity.
TL;DR: In this paper, a 3D-printed MoS2/MoSe2 heterostructures with bioinspired circular-cored square/hexagonal honeycomb topologies were developed.
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Macroscale Superlubricity with Ultralow Wear and Ultrashort Running-In Period (∼1 s) through Phytic Acid-Based Complex Green Liquid Lubricants.
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TL;DR: In this paper, the impact of friction and wear on energy consumption, economic expenditure, and CO2 emissions is presented on a global scale, covering four main energy consuming sectors: transportation, manufacturing, power generation, and residential.
Superlubricity of Graphite
Martin Dienwiebel,Gertjan S. Verhoeven,N. Pradeep,Joost W. M. Frenken,Jennifer A. Heimberg,Henny W. Zandbergen +5 more
TL;DR: By measuring atomic-scale friction as a function of the rotational angle between two contacting bodies, it is shown that the origin of the ultralow friction of graphite lies in the incommensurability between rotated graphite layers.
Macroscale superlubricity enabled by graphene nanoscroll formation
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TL;DR: Simulations showed that sliding of the graphene patches around the tiny nanodiamond particles led to nanoscrolls with reduced contact area that slide easily against the amorphous diamondlike carbon surface, contributing to superlubricity at engineering scale.
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Observation of Microscale Superlubricity in Graphite
Ze Liu,Ze Liu,Jiarui Yang,Francois Grey,Jefferson Zhe Liu,Yilun Liu,Yibing Wang,Yanlian Yang,Yao Cheng,Quanshui Zheng,Quanshui Zheng +10 more
TL;DR: It is shown how the grain structure of highly oriented pyrolitic graphite determines the probability of self-retraction, and the robustness of the phenomenon opens the way for practical applications of superlubricity in micromechanical systems.
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