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Friction occurs in various systems from the nanoscale to the geophysical scale and plays a crucial role. The microscopic mechanism of friction and the origin of the dynamic ordering in interacting particle systems are still controversial. Using Langevin simulations, we study the friction of two-dimensional colloids on the substrate with randomly distributed point-like pinning centers. We consider three different model colloidal systems, and in each system the colloidal particles interact with each other through repulsive interactions that have two different force ranges, as shown in Fig-1. We find two maximum static friction forces (the first maximum static friction fc1d and the second maximum static friction fc2d). The interference between short-range repulsive interactions with similar force ranges in model 3 colloidal system can lead to significantly increased repulsion between particles near pinning centers, resulting in a decrease in fc1d and an enhanced orderly movement along the direction of external driving forces above fc2d. The results provide guide for revealing the mechanisms of friction in the colloidal particles with interactions that have different force ranges.
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Keywords:
- Friction /
- colloids /
- plastic flow /
- moving order
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