Scientists Reveal Mechanism of Graphene Friction Evolution Behavior

A study by Sun Jun, a professor at Xi'an Jiaotong University and a team at home and abroad, published online in Nature on November 24th, shows that interface friction has a unique mechanism for two-dimensional materials, that is, two-dimensional materials due to their ultra-thin geometry. The characteristics and the large flexibility can affect the pinning state of the contact interface by changing the self-configuration, and thus the frictional performance can be controlled from the "quality" of the interface rather than the "quantity". The conclusions of this study subvert the conclusions of the recent tribological studies that show that "the friction behavior of three-dimensional solid materials in the absence of wear is often directly related to the actual contact area of ​​the interface."
Since it was first prepared in 2004, two-dimensional materials represented by graphene have become a hot topic in academic research because of their unique electrical, magnetic, thermal and mechanical properties. However, the traditional microscopic friction theory has not given a reasonable explanation for the evolution behavior exhibited in the friction process of two-dimensional materials.
Through the atomic simulation, the cooperative team reproduces all the core phenomena of graphene friction behavior for the first time, and proposes a new friction evolution and regulation mechanism that may exist in two-dimensional materials, namely the dominant interface friction (including its transient evolution) behavior. The key factor is the “quality” of the interface, that is, the local pinning strength between the upper and lower surface atoms and the synergy of the entire interface bite. It is this special "contact quality" regulation ability that makes graphene have a strange evolutionary effect and layer dependency in friction. Based on this, the team also proposed and demonstrated a new idea of ​​large-scale control of surface friction behavior by applying controllable deformation to two-dimensional materials.
This study provides theoretical support for the more efficient application of graphene in the field of friction and wear. The international team collaborators include Dr. Li Suzhi of Sun Jun's research group, Li Ju, professor of the Massachusetts Institute of Technology, Li Qunyang, associate professor of Tsinghua University, and Robert Kalpic, professor of the University of Pennsylvania.

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