通过石墨烯纳米卷形成实现的宏观超润滑,Science

当前位置： X-MOL 学术 › Science › 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.)

通过石墨烯纳米卷形成实现的宏观超润滑
Science ( IF 44.7 ) Pub Date : 2015-05-14 , DOI: 10.1126/science.1262024
Diana Berman ₁ , Sanket A. Deshmukh ₁ , Subramanian K. R. S. Sankaranarayanan ₁ , Ali Erdemir ₂ , Anirudha V. Sumant ₁

Affiliation

滑动滑离许多应用都将受益于超低摩擦条件，以最大限度地减少移动部件（如硬盘驱动器或发动机）的磨损。在很小的范围内，已经观察到石墨作为润滑剂的超低摩擦。伯曼等人。使用石墨烯与结晶金刚石纳米颗粒和类金刚石碳相结合实现了超润滑（参见 Hone 和 Carpick 的观点）。模拟表明，石墨烯贴片在微小纳米金刚石颗粒周围的滑动导致纳米卷的接触面积减少，很容易在无定形类金刚石碳表面上滑动。科学，这个问题 p。第1118章另见第。用石墨烯片包裹的 1087 纳米金刚石导致与类金刚石碳表面的超低摩擦。[另见 Hone 和 Carpick 的观点] 摩擦和磨损仍然是移动机械组件中机械能耗散的主要模式；因此，希望在许多应用中最小化摩擦。我们证明，当石墨烯与纳米金刚石颗粒和类金刚石碳 (DLC) 结合使用时，可以在工程规模上实现超润滑性。宏观超润滑性源于滑动界面处的石墨烯贴片包裹纳米金刚石，形成接触面积减少的纳米卷，该纳米卷与 DLC 表面滑动，实现不相称的接触和显着降低的摩擦系数 (~0.004)。原子模拟阐明了连接纳米级力学和宏观实验观察的整体机制和介观联系。

"点击查看英文标题和摘要"

Macroscale superlubricity enabled by graphene nanoscroll formation

Slip sliding away Many applications would benefit from ultralow friction conditions to minimize wear on the moving parts such as in hard drives or engines. On the very small scale, ultralow friction has been observed with graphite as a lubricant. Berman et al. achieved superlubricity using graphene in combination with crystalline diamond nanoparticles and diamondlike carbon (see the Perspective by Hone and Carpick). Simulations showed that sliding of the graphene patches around the tiny nanodiamond particles led to nanoscrolls with reduced contact area that slide easily against the amorphous diamondlike carbon surface. Science, this issue p. 1118; see also p. 1087 Nanodiamonds wrapped with graphene sheets lead to ultralow friction against a diamondlike carbon surface. [Also see Perspective by Hone and Carpick] Friction and wear remain as the primary modes of mechanical energy dissipation in moving mechanical assemblies; thus, it is desirable to minimize friction in a number of applications. We demonstrate that superlubricity can be realized at engineering scale when graphene is used in combination with nanodiamond particles and diamondlike carbon (DLC). Macroscopic superlubricity originates because graphene patches at a sliding interface wrap around nanodiamonds to form nanoscrolls with reduced contact area that slide against the DLC surface, achieving an incommensurate contact and substantially reduced coefficient of friction (~0.004). Atomistic simulations elucidate the overall mechanism and mesoscopic link bridging the nanoscale mechanics and macroscopic experimental observations.

更新日期：2015-05-14

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南