润滑
单层
离子液体
材料科学
消散
烷基
石墨
稳健性(进化)
离子键合
化学物理
分子动力学
纳米技术
热力学
离子
复合材料
计算化学
化学
有机化学
物理
生物化学
基因
催化作用
作者
Yumiao Lu,Yanlei Wang,Feng Huo,Wei Chen,Ming Ma,Wei-Lu Ding,Hongyan He,Suojiang Zhang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-10-12
卷期号:16 (10): 16471-16480
被引量:2
标识
DOI:10.1021/acsnano.2c05779
摘要
Ultralow friction between interacting surfaces in relative motion is of vital importance in many pure and applied sciences. We found that surfaces bearing ordered monolayer ionic liquids (ILs) can have friction coefficient μ values as low as 0.001 at pressures up to 78 MPa and exhibit good structure recoverability. This extreme lubrication is attributed primarily to the ordered striped structure driven by the "atomic-locking" effect between carbon atoms on the alkyl chain of ILs and graphite. The longer alkyl chain has lower μ values, and the stripe periodicity is decisive in reducing energy dissipation during the sliding process. In combination with simulation, the alternate atomic-scale ordered and disordered ionic regions were recognized, whose ratio fundamentally determines the μ values and lubrication mechanism. This finding is an important step toward the practical utilization of ILs with negligible vapor pressure as superlubricating materials in future technological applications operating under extreme conditions.
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