Abstract In life, friction is everywhere. The international top journal "Nature" published the latest research results of Xi'an Jiaotong University on November 24, 2016. The article reveals the mechanism of the friction behavior of graphene which dominates two-dimensional materials, and will be in this field in China...
In life, friction is everywhere. The international top journal "Nature" published the latest research results of Xi'an Jiaotong University on November 24, 2016. The article reveals the mechanism of the friction behavior of graphene, which dominates two-dimensional materials, and promotes the research in this field in China. To the international frontier level. Recently, the first author of the paper, Dr. Li Suzhi, the State Key Laboratory of Metal Materials Strength of Xi'an Jiaotong University, which is currently conducting research work in Germany, interviewed reporters online and told about the beginning and end of the research. Scientific research is a process of continuous discovery. 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. The friction test on graphene found that its friction behavior is also very strange, and it is obviously different from graphite. The peculiar friction behavior of graphene has caused widespread concern and discussion about its intrinsic physical mechanism. Under the guidance of Prof. Li Ju from the Massachusetts Institute of Technology, Li Suzhi conducted collaborative research with relevant professors from several famous universities such as Tsinghua University and the University of Pennsylvania, and finally gave a detailed and in-depth explanation of the internal mechanism of the dominant graphene friction behavior. .
Through atomic simulation, the cooperative research 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. New research shows that in the process of contact friction, graphene does cause different surface deformation ability due to different layers, which affects the real contact area. However, the effect of this simple wrinkle effect on the interface friction is in some cases. It is very likely to be very limited.
If graphite is considered as a book, then graphene is one of the pages. During the sliding process, thin graphene is easy to form wrinkles, and the geometry can be adjusted at any time to adapt to changes in the external contact environment. It is this special regulation ability that makes graphene have a strange evolution effect and layer dependency in friction. Based on this mechanism, the research team also proposed and demonstrated a new idea of ​​large-scale control of surface friction behavior by applying controllable deformation to two-dimensional materials.
Ding Xiangdong, a professor at Xi'an Jiaotong University, said that the nature of basic research determines that this research cannot produce benefits quickly, but its impact is far-reaching. He explained that this article found the limitations of traditional friction theory in two-dimensional materials, and refined and extended the friction mechanism of the dominant two-dimensional materials. At the same time, a new idea of ​​regulating the friction behavior through the geometric configuration of two-dimensional materials is proposed, which also has important implications for other aspects such as optics and electricity. In practical applications, as a new generation of solid lubricants, graphene has been superior to traditional materials in many aspects. The current work is expected to serve as a theoretical basis to further guide the application of graphene as a nano-solid lubricant in practice. .
"Nature" magazine published a special review in the "News and Comments" column of the same period, and gave positive comments to the article: "This work not only reveals the source of graphene's strange friction behavior, but also triggers the exploration of friction mechanism on many levels. It also offers the possibility to study the friction-enhancing behavior of complex systems in a controlled way."
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