实现摩擦系数小于10-3的宏观超滑对能源的节约和环境保护具有重要的意义。低摩擦界面和纳米滚动摩擦添加剂的结合是实现宏观超滑拓展超滑在宏观条件下应用的有效方法。然而相比于宏观下的滚动摩擦，人们对纳米尺度下的滚动摩擦了解较少，特别是纳米滚动摩擦条件下界面之间电荷相互作用导致的摩擦耗散机制。本项目拟从原子尺度上，系统研究纳米管/球滑动摩擦和滚动摩擦机制。首先本项目将发展纳米尺度滑动/滚动摩擦的第一性原理模拟方法；第二，从电荷密度变化的角度揭示滚动/滑动摩擦的物理根源；第三，研究内外部因素对滚动/滑动摩擦性能的影响，揭示纳米尺度滚动摩擦的调控机制；第四，在低摩擦界面中加入具有滚动特征的纳米材料，对滚动摩擦在宏观下的减摩作用进行初步验证。最终，基于模拟和实验分析结果，本项目将从摩擦和物理角度从电子层面探讨滚动摩擦的一般机理，为推动基于微观设计实现宏观超滑的新一代设计理念和理论的建立奠定基础。

The achievement of macroscale superlubricity which terms as the friction coefficient less than 10-3 has significant implications for energy conservation and environmental protection. The low-friction interface combined with nano-scrolling solid additive is an effective strategy to enable macroscale superlubricity. However, in contrast to the enormous studies on scrolling friction at macroscale, much less has been done to understand the friction mechanism of scrolling friction at nanoscale, especially for the energy dissipation induced by the electronic charge redistribution at atomic scale. In this proposed project, we will systematically study the nano-scale friction mechanism of nanospheres and nanotubes at scrolling/sliding condition. More specifically, we will first develop a simulation method to explore nano-scale scrolling /sliding friction. Secondly, we will study the mechanism of scrolling friction at nanoscale and investigated the physical origins by mean of the evolution of electric density. Thirdly, we will study the effects of internal and external conditions on nano-scale scrolling/sliding friction, therefore, elucidate the regulation mechanism of scrolling friction. Fourthly, we will preliminarily verify the effect of nano-scale scrolling on the macro-scale friction with the introduction of nano-materials with rolling characteristics to the low friction interface. Last but not least, based on the results of simulation and experimental analysis, the general mechanism of scrolling friction will be discussed from the perspective of tribology and physics at the electronic level. The findings will lay a foundation for promoting the new generation of design concepts and theories that is to achieve macroscale superlubricity based on the design at micro scale.