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Friction

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Friction of two-dimensional colloidal particles with magnetic dipole and Lennard–Jones interactions: A numerical study

  • Zhongying Zhang
  • Cange Wu
  • Qi Zhang
  • Yigang CaoEmail author
Open Access
Research Article
  • 64 Downloads

Abstract

We use Langevin simulations to study the sliding friction of two-dimensional colloidal particles on a substrate with randomly distributed point-like pinning centers. The colloidal particles are modeled to interact with each other through repulsive magnetic dipole and attractive Lennard–Jones potentials. The subsequent occurrence of superlubricity, wherein the average friction force equals to zero, is accompanied by the appearance of islands with clear boundaries in the microscopic colloidal structures for weak pinning substrates. Friction arises for strong pinning substrates, and the average friction force increases with the substrate pinning intensity, and further, the islands disperse into disordered plastic structures. Moreover, the average friction force decreases with the repulsion intensity between the colloidal particles, and superlubricity finally results when the repulsion becomes sufficiently strong. Superlubricity also occurs for sufficiently weak attraction between colloidal particles, with an increase in the attraction intensity between colloidal particles leading to a nonlinear increase in the average friction force. With increasing temperature, the average friction force firstly increases and subsequently decreases rapidly. The above results can provide a theoretical framework for biological self-organization via utilization of the friction properties of microscopic or mesoscopic colloidal systems.

Keywords

friction sliding friction superlubricity self-assembly 

Notes

Acknowledgements

This work was supported by the Postgraduate Education Reform Project of Henan Province under Grant No. 2017SJGLX011Y and Postgraduate Education Research Project of Zhengzhou University under Grant No. YJSJY201758 as well as University Students’ Innovative Entrepreneurial Project under Grant No. 2017cxcy20.

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Authors and Affiliations

  • Zhongying Zhang
    • 1
  • Cange Wu
    • 1
  • Qi Zhang
    • 1
  • Yigang Cao
    • 1
    Email author
  1. 1.School of Physics and EngineeringZhengzhou UniversityZhengzhouChina

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