What is it about?
The mechanisms by which surface topography features (achieved by regulating the asperity amplitude and frequency parameters) influence system lubrication performance and nanoparticle tribological behavior were systematically investigated through friction experiments and molecular simulations.
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Why is it important?
The results indicate that at the micro-nanoscale, the amplitude parameter predominantly governs the surface roughness features and frictional resistance. This is because an increased amplitude strengthens the boundary lubrication effect, exacerbates the stress concentration and structural deformation of graphene, and makes fullerene prone to filling grooves but less capable of bearing normal loads, thereby exacerbating friction and wear. In contrast, the frequency parameter primarily determines the surface kurtosis features and normal force. At low frequencies, low kurtosis features intensify the normal squeezing effect of asperities, inducing the hydrodynamic pressure effect of the base oil, thus enhancing lubrication performance. Compared with frequency, the pronounced influence of amplitude on the lubrication state and interface contact behavior dominates the tribological properties of the system and the lubrication mechanism of the nanoparticles. Low surface roughness and kurtosis features are critical for achieving efficient lubrication.
Perspectives
This study offers valuable insights into the design of surface topography and the optimization of lubrication performance.
Feng Qiu
Hefei University of Technology
Read the Original
This page is a summary of: Atomistic insights into graphene/fullerene nanoparticles coupled surface topography features in solid–liquid composite lubrication, Friction, July 2026, Tsinghua University Press,
DOI: 10.26599/frict.2025.9441163.
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