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Charge Density Evolution Governing Interfacial Friction.

Junhui Sun1,2, Xin Zhang1, Shiyu Du3,4

  • 1School of Mechanical Engineering, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China.

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|February 22, 2023
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Summary
This summary is machine-generated.

Interfacial friction arises from electronic barriers resisting atomic rearrangement during slip. This study reveals a linear relationship between frictional energy dissipation and electronic evolution, offering insights into shear strength and contact mechanics.

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Area of Science:

  • Surface Science
  • Tribology
  • Condensed Matter Physics

Background:

  • The electron nature of solids significantly influences contact system properties.
  • General rules governing electron coupling in interfacial friction are not well-established.
  • Understanding interfacial friction is crucial for materials science and nanotechnology.

Purpose of the Study:

  • To investigate the physical origins of friction in solid interfaces.
  • To establish a model for interfacial friction based on electronic interactions.
  • To explore the relationship between electronic evolution and frictional energy dissipation.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • Analysis of electron density variations along sliding pathways.
  • Tracking frictional energy dissipation during slip.

Main Results:

  • Interfacial friction is linked to electronic barriers hindering contact configuration changes.
  • Frictional energy dissipation exhibits a linear dependence on electronic evolution.
  • A charge evolution model correlates friction with electronic rearrangement.
  • The model provides insights into shear strength and the real contact area hypothesis.

Conclusions:

  • Electronic interactions fundamentally govern interfacial friction across various bond types (van der Waals, metallic, ionic, covalent).
  • The charge evolution model offers a new perspective on friction at the electronic level.
  • This work paves the way for designing nanomechanical devices and understanding natural fault mechanics.