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Carbon Atomic Steps
At the graphene step edge, the armchair (AC) structure gives only a minor topographic effect on friction, while the zigzag (ZZ) structure induces friction two orders of magnitude larger than the basal friction. The high‐friction ZZ edge becomes superlubricious through reconstructing to the (5,7) azulene‐like structure upon thermal annealing in an inert gas environment. More details...
Two‐dimensional (2D) lamellar materials are normally capable of rendering super‐low friction, wear protection, and adhesion reduction in nanoscale due to their ultralow shear strength between two basal plane surfaces. However, high friction at step edges prevents the 2D materials from achieving super‐low friction in macroscale applications and eventually leads to failure of lubrication performance...
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