当前位置：
X-MOL 学术
›
Nano Lett.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Velocity Dependence of Moiré Friction
Nano Letters ( IF 9.6 ) Pub Date : 2022-11-30 , DOI: 10.1021/acs.nanolett.2c03667 Yiming Song 1 , Xiang Gao 2 , Antoine Hinaut 1 , Sebastian Scherb 1 , Shuyu Huang 1, 3 , Thilo Glatzel 1 , Oded Hod 2 , Michael Urbakh 2 , Ernst Meyer 1
Nano Letters ( IF 9.6 ) Pub Date : 2022-11-30 , DOI: 10.1021/acs.nanolett.2c03667 Yiming Song 1 , Xiang Gao 2 , Antoine Hinaut 1 , Sebastian Scherb 1 , Shuyu Huang 1, 3 , Thilo Glatzel 1 , Oded Hod 2 , Michael Urbakh 2 , Ernst Meyer 1
Affiliation
|
Friction force microscopy experiments on moiré superstructures of graphene-coated platinum surfaces demonstrate that in addition to atomic stick–slip dynamics, a new dominant energy dissipation route emerges. The underlying mechanism, revealed by atomistic molecular dynamics simulations, is related to moiré ridge elastic deformations and subsequent relaxation due to the action of the pushing tip. The measured frictional velocity dependence displays two distinct regimes: (i) at low velocities, the friction force is small and nearly constant; and (ii) above some threshold, friction increases logarithmically with velocity. The threshold velocity, separating the two frictional regimes, decreases with increasing normal load and moiré superstructure period. Based on the measurements and simulation results, a phenomenological model is derived, allowing us to calculate friction under a wide range of room temperature experimental conditions (sliding velocities of 1–104 nm/s and a broad range of normal loads) and providing excellent agreement with experimental observations.
中文翻译：
莫尔摩擦的速度依赖性
石墨烯涂层铂表面莫尔超结构的摩擦力显微镜实验表明，除了原子粘滑动力学外，还出现了一种新的主要能量耗散途径。原子分子动力学模拟揭示的潜在机制与莫尔脊弹性变形和随后由于推动尖端的作用而松弛有关。测得的摩擦速度依赖性显示出两种不同的状态：(i) 在低速时，摩擦力很小且几乎恒定；(ii) 在某个阈值之上，摩擦随速度呈对数增加。将两种摩擦状态分开的阈值速度随着法向载荷和莫尔超结构周期的增加而降低。基于测量和模拟结果，推导出现象学模型，4 nm/s 和广泛的正常负载范围），并与实验观察结果非常吻合。
更新日期：2022-11-30
中文翻译：
莫尔摩擦的速度依赖性
石墨烯涂层铂表面莫尔超结构的摩擦力显微镜实验表明，除了原子粘滑动力学外，还出现了一种新的主要能量耗散途径。原子分子动力学模拟揭示的潜在机制与莫尔脊弹性变形和随后由于推动尖端的作用而松弛有关。测得的摩擦速度依赖性显示出两种不同的状态：(i) 在低速时，摩擦力很小且几乎恒定；(ii) 在某个阈值之上，摩擦随速度呈对数增加。将两种摩擦状态分开的阈值速度随着法向载荷和莫尔超结构周期的增加而降低。基于测量和模拟结果，推导出现象学模型，4 nm/s 和广泛的正常负载范围），并与实验观察结果非常吻合。
京公网安备 11010802027423号