Superlubric to stick-slip sliding of incommensurate graphene flakes on graphite

湿转移溶液处理石墨烯片的固体润滑：介观接触中的耗散机制与超润滑

Solid lubrication by wet-transferred solution-processed graphene flakes: dissipation mechanisms and superlubricity in mesoscale contacts

本研究利用胶体探针原子力显微镜探讨溶液处理石墨烯片在介观接触中的摩擦性能，发现湿转移形成非均匀涂层导致黏滑耗散，并基于热激活Prandtl-Tomlinson模型全面解释了不同材料基底和滑动状态下的摩擦实验。

Superlubricity of Graphene Nanoribbons on Gold Surfaces

The state of vanishing friction known as superlubricity has important applications for energy saving and increasing the lifetime of devices. Superlubricity detected with atomic force microscopy appears in examples like sliding large graphite flakes or gold nanoclusters across surfaces. However, the origin of the behavior is poorly understood due to the lack of a controllable nano-contact. We demonstrate graphene nanoribbons superlubricity when sliding on gold with a joint experimental and computational approach. The atomically well-defined contact allows us to trace the origin of superlubricit…

石墨烯超润滑性由摩擦诱导纳米接触实现

Graphite superlubricity enabled by triboinduced nanocontacts

本研究通过胶体探针原子力显微镜揭示石墨超润滑性源于摩擦转移纳米微凸体的双重作用，其减小真实接触面积并控制耗散，且滑动状态受负载调控，符合Prandtl-Tomlinson模型。

临界压力以上零摩擦系数的观测

Observation of zero coefficient of friction above a critical pressure

该研究首次实验观测到微尺度单晶石墨与纳米粗糙度金基底在临界压力以上的自超润滑现象，建立了临界压力无量纲判据并验证，为低功耗长寿命微系统提供变革性原理。

Interlayer Coupling and Strain Localization in Small-Twist-Angle Graphene Flakes

Twisted bilayer graphene (TBG) exhibits a wide range of intriguing physical properties, such as superconductivity, ferromagnetism, and superlubricity. Depending on the twist angle, periodic moiré superlattices form in twisted bilayer graphene, with inhomogeneous interlayer coupling and lattice deformation. For a small twist angle (typically <2°), each moiré supercell contains a large number of atoms (>10,000), making it computationally expensive for first-principles and atomistic modeling. In this work, a finite element method based on a continuum model is used to simulate the inhomogeneous in…

由摩擦诱导石墨转移层包覆的胶体AFM探针的滑动摩擦与超润滑

Sliding friction and superlubricity of colloidal AFM probes coated by tribo-induced graphitic transfer layers

本研究利用胶体探针AFM探索石墨表面的滑动摩擦与超润滑现象，发现摩擦诱导的转移层使系统转变为低摩擦状态，其载荷驱动的粘滑到超润滑转变可由Prandtl-Tomlinson模型描述，且耗散随基底原子起伏增加而增大。

Molecular dynamics of cleavage and flake formation during the interaction of a graphite surface with a rigid nanoasperity

Computer experiments concerning interactions between a graphite surface and the rigid pyramidal nanoasperity of a friction force microscope tip when it is brought close to and retracted from the graphitic sample are presented. Covalent atomic bonds in graphene layers are described using a Brenner potential and tip-carbon forces are derived from the Lennard-Jones potential. For interlayer interactions a registry-dependent potential with local normals is used. The behavior of the system is investigated under conditions of different magnitudes of tip-sample interaction and indentation rates. Stro…

Superlubricity through graphene multilayers between Ni(111) surfaces

A single graphene layer placed between two parallel Ni(111) surfaces screens the strong attractive force and results in a significant reduction of adhesion and sliding friction. When two graphene layers are inserted, each graphene is attached to one of the metal surfaces with a significant binding and reduces the adhesion further. In the sliding motion of these surfaces the transition from stick-slip to continuous sliding is attained, whereby non-equilibrium phonon generation through sudden processes is suppressed. The adhesion and corrugation strength continues to decrease upon insertion of t…

结构润滑二维界面摩擦的有效粘滑参数

Effective stick-slip parameter for structurally lubric 2D interface friction

针对结构润滑二维界面的平滑与粘滑滑动判别问题，本文基于石墨烯滑动模拟提出有效 Prandtl–Tomlinson 参数 η_eff，仅需估计有效能垒即可预测滑动状态。

原子级平整界面中的单接触问题：一种模拟方法

Single-Contact Problem in Atomically Flat Interfaces: a Simulation Approach

研究晶体SiO₂/SiO₂界面单接触问题，结合原子模拟与改进连续介质模型，计算界面滑动势能面确定相关摩擦参数，扩展Mindlin模型描述粘滑转变，实验验证模型与实际微粗糙摩擦学相关。