声明
摘要
Abstract
Contents
Chapter 1 Introduction of nanoscale friction
1.1 Introduction
1.2 Main techniques to study nanoscale friction
1.2.1 Experimental techniques
1.2.2 Molecular dynamics simulation
1.2.3 Theoretical models for nanoscale friction
1.3 A unique phenomenon in nanoscale friction-structural superlubricity
1.4 Factors that control nanoscale friction
1.4.1 Temperature effect
1.4.2 Surface effect
1.4.3 Velocity and normal load effect
1.5 Open questions in this thesis
1.6 Outline of this thesis
Chapter 2 Effects of commensurability and charge on the frictional behavior of 2D crystals
2.1 Introduction
2.2 Commensurate effect on nanoscale friction and stacking mode
2.2.1 Method and model
2.2.2 Results and discussion
2.2.3 Conclusions and discussion
2.3 Coupling effect of commensurability and charge
2.3.1 Method and model
2.3.2 Results and discussion
2.4 Charge distribution effect on graphene oxides
2.4.1 Method and model
2.4.2 Results and discussion
2.4.3 Conclusion and perspective
2.5 Summary
Chapter 3 Diffusion behavior of graphene flake on graphene substrate
3.1 Introduction
3.2 Method and model
3.3 Results and discussion
3.3.1 Diffusion behavior under different temperature
3.3.2 Rotational degree of freedom
3.3.3 z direction fluctuation of graphene flake
3.4 Conclusions and summary
Chapter 4 Sliding behavior of graphene flake on graphene substrate
4.1 Introduction
4.2 Method and model
4.3 Results and discussion
4.4 Conclusions and summary
Chapter 5 Predicting the lifetime of superlubricity
5.1 Introduction
5.2 Results and discussion
5.2.1 Sliding dynamics of atomistically smooth surfaces with critical transition
5.2.2 Simplified description by using the Frenkel-Kontorova model
5.2.3 Statistical indicators for the superlubric breakdown in the FK model
5.2.4 Indicator-based engineering strategies to extend the lifetime of superlubricity
5.3 Conclusions
Chapter 6 Conclusions and future work
6.1 Conclusions
6.2 Future work
References
Acknowledgments
Publications
Appendix