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| Format: | Recurso digital |
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Zenodo
2025
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| Online Access: | https://doi.org/10.1021/acsami.5c16288 |
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Table of Contents:
- <p>“Structural superlubricity”, a state of frictionless sliding<br>between crystalline surfaces, has been observed at the nanoscale and<br>microscale. However, achieving it at the macroscale requires further<br>investigation. Inspired by recent experimental studies, we theoretically<br>examine the friction behavior of macroscale patterned surfaces<br>composed of microscale bumps coated with superlubricious twodimensional materials. We performed numerical simulations with the<br>discrete element method. The Hertz contact model, along with a<br>modified tangential Mindlin contact model, is employed to capture<br>the nonlinear relationship between the coefficient of friction and normal load. Our results reveal that the friction behavior is<br>significantly influenced by the radius of the microscale bumps, the durability of the coating, and the elasticity of the surface, and we<br>show how those can be tuned to improve friction properties. Additionally, we analytically investigate the deformation mechanisms of<br>the surface structure and derive scaling laws for parameters and the breakdown of superlubricity. The simulation results show strong<br>agreement with the analytical derivations of power laws for scaling of various quantities with the total macroscopic load. Finally, we<br>examine imperfect conditions by investigating how height variations impact frictional performance.</p>