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Crystals 2018, 8(4), 167;

The Influence of Hydroxyl Groups on Friction of Graphene at Atomic Scale

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Author to whom correspondence should be addressed.
Received: 21 March 2018 / Revised: 10 April 2018 / Accepted: 13 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue Graphene Mechanics)
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Hydroxyl groups play an important role in friction of graphene oxides. In this paper, the influence of hydroxyl groups on friction of graphene is investigated by molecular dynamics simulation. The results show that the friction does not always go up with the rising of hydroxyl groups ratio, and reaches the maximum when the hydroxyl groups ratio between interfaces is about 10%. The reason is that hydrogen bonds tend to form in interlayers when the hydroxyl groups ratio is high. The formed hydrogen bonds between interfaces are closely related to the friction. However, the analysis of the component of van der Waals, Coulomb’s forces and hydrogen bonds interaction between interfaces indicates that van der Waals forces are dominant in friction, which can be attributed to the influence of interface distance on friction. View Full-Text
Keywords: graphene; friction at atomic scale; hydroxyl groups graphene; friction at atomic scale; hydroxyl groups

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Li, R.; Song, C. The Influence of Hydroxyl Groups on Friction of Graphene at Atomic Scale. Crystals 2018, 8, 167.

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