Robust microscale structural superlubricity between graphite and nanostructured surface.
Robust microscale structural superlubricity between graphite and nanostructured surface.
复制标题
DOI：
10.1038/s41467-023-38680-6
复制
发表时间：
2023-05-22
影响因子：
16.6
通讯作者：
Zheng, Quanshui
中科院分区：
文献类型：
--
作者：
Huang, Xuanyu;Li, Tengfei;Wang, Jin;Xia, Kai;Tan, Zipei;Peng, Deli;Xiang, Xiaojian;Liu, Bin;Ma, Ming;Zheng, Quanshui
结构超润滑性是指两个接触的固体表面之间几乎没有摩擦和磨损的状态。然而，由于石墨片的边缘缺陷，这种状态有一定的失效概率。在这里，我们实现了环境条件下微米级石墨片和纳米结构硅表面之间的强健结构超润滑态。发现摩擦始终小于1μN，差动摩擦系数在10−4量级，无明显磨损。这是由于纳米结构表面的石墨片在集中力作用下发生了边缘翘曲，从而消除了石墨片与衬底之间的边缘相互作用。这项研究不仅挑战了摩擦学和结构超润滑性方面的传统理解，即粗糙的表面会导致更高的摩擦和磨损，从而降低粗糙度要求，而且还证明，在大气条件下，具有单晶表面且不与基材边缘接触的石墨片可以与任何非范德华材料保持稳定的结构超润滑性状态。此外，本研究还提供了一种通用的表面改性方法，使结构超润滑性技术在大气环境中得到广泛应用。结构超润滑性是指两个接触的固体表面之间几乎没有摩擦和磨损的状态。在这里，作者证明，通过防止边缘与衬底接触，在环境条件下，微米级的石墨片可以在纳米结构硅表面上实现坚固的SSL。
Structural superlubricity is a state of nearly zero friction and no wear between two contacted solid surfaces. However, such state has a certain probability of failure due to the edge defects of graphite flake. Here, we achieve robust structural superlubricity state between microscale graphite flakes and nanostructured silicon surfaces under ambient condition. We find that the friction is always less than 1 μN, the differential friction coefficient is on the order of 10−4, without observable wear. This is attributed to the edge warping of graphite flake on the nanostructured surface under concentrated force, which eliminate the edge interaction between the graphite flake and the substrate. This study not only challenges the traditional understanding in tribology and structural superlubricity that rougher surfaces lead to higher friction and lead to wear, thereby reducing roughness requirements, but also demonstrates that a graphite flake with a single crystal surface that does not come into edge contact with the substrate can consistently achieve robust structural superlubricity state with any non-van der Waals material in atmospheric conditions. Additionally, the study provides a general surface modification method that enables the widespread application of structural superlubricity technology in atmospheric environments. Structural superlubricity (SSL) is a state of nearly zero friction and no wear between two contacted solid surfaces. Here, authors show that, by preventing edge contact with the substrate, a microscale graphite flake can achieve robust SSL against nanostructured silicon surfaces under ambient condition.
登录
查看更多内容
影响因子：
3.3
作者：
Kumagai, T.;Izumi, S.;Sakai, S.
通讯作者：
Sakai, S.
影响因子：
17.6
作者：
Huang, Xuanyu;Lin, Li;Zheng, Quanshui
通讯作者：
Zheng, Quanshui
DOI：
10.1073/pnas.1922681117
发表时间：
2020-06-09
影响因子：
11.1
作者：
Peng, Deli;Wu, Zhanghui;Zheng, Quanshui
通讯作者：
Zheng, Quanshui
影响因子：
4.1
作者：
PLIMPTON, S
通讯作者：
PLIMPTON, S
影响因子：
64.8
作者：
Hod, Oded;Meyer, Ernst;Urbakh, Michael
通讯作者：
Urbakh, Michael