Acquisition of molecular rolling lubrication by self-curling of graphite nanosheet at cryogenic temperature

Panpan Li, Wenhao He, Pengfei Ju, Li Ji (), Xiaohong Liu, Fan Wu, Zhibin Lu (), Hongxuan Li (), Lei Chen, Jingzhou Liu, Huidi Zhou and Jianmin Chen ()
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Panpan Li: Chinese Academy of Sciences
Wenhao He: Chinese Academy of Sciences
Pengfei Ju: Shanghai Aerospace Equipment Manufacture
Li Ji: Chinese Academy of Sciences
Xiaohong Liu: Chinese Academy of Sciences
Fan Wu: Chinese Academy of Sciences
Zhibin Lu: Chinese Academy of Sciences
Hongxuan Li: Chinese Academy of Sciences
Lei Chen: Chinese Academy of Sciences
Jingzhou Liu: Shanghai Aerospace Equipment Manufacture
Huidi Zhou: Chinese Academy of Sciences
Jianmin Chen: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Friction as a fundamental physical phenomenon dominates nature and human civilization, among which the achievement of molecular rolling lubrication is desired to bring another breakthrough, like the macroscale design of wheel. Herein, an edge self-curling nanodeformation phenomenon of graphite nanosheets (GNSs) at cryogenic temperature is found, which is then used to promote the formation of graphite nanorollers in friction process towards molecular rolling lubrication. The observation of parallel nanorollers at the friction interface give the experimental evidence for the occurrence of molecular rolling lubrication, and the graphite exhibits abnormal lubrication performance in vacuum with ultra-low friction and wear at macroscale. The molecular rolling lubrication mechanism is elucidated from the electronic interaction perspective. Experiments and theoretical simulations indicate that the driving force of the self-curling is the uneven atomic shrinkage induced stress, and then the shear force promotes the intact nanoroller formation, while the constraint of atomic vibration decreases the dissipation of driving stress and favors the nanoroller formation therein. It will open up a new pathway for controlling friction at microscale and nanostructural manipulation.

Date: 2024
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DOI: 10.1038/s41467-024-49994-4

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