Superlubricity of hydrogenated carbon films in a nitrogen gas environment: adsorption and electronic interactions at the sliding interface | |
Department | 先进润滑与防护材料研究发展中心 |
Wang CB(王成兵)1,2; Li, Bingrui3; Ling, Xiaoming4; Zhang JY(张俊彦)2; Wang CB(王成兵); Zhang JY(张俊彦) | |
The second department | 固体润滑国家重点实验室 |
2017 | |
Source Publication | RSC Advances |
ISSN | 2046-2069 |
Volume | 7Issue:5Pages:3025-3034 |
Abstract | The tribological behavior of hydrogenated amorphous carbon film (a-C:H) is known to be very sensitive to the external environment. In an N2 environment, a-C:H can maintain long-term superlubricity. Currently, no convincing explanation is available for the mechanism through which N2 significant decreases the friction coefficients. In this work, we explain the tribological behavior of a-C:H films by accounting for the internal electronic structure of ambient gas molecules, their atomic electronegativity, the surface bonding state of a-C:H, and the synergistic effects of these factors. Here, we proposed a mechanism based on the unique electronic structure of N2 molecules. N2 has two lone electron pairs, and its lone-pair electrons interact with surface C–H bonds of a-C:H, forming –C–H⋯:NN: interactions that are similar to the hydrogen bonds in water. This causes N2 to be adsorbed on the film's surface. As two surfaces approach each other, the other lone-pair electrons in N2 become close, generating electrostatic repulsion and resulting in super-low friction. Based on the above analysis, we calculated the friction forces of a self-mated a-C:H film in different environments (vacuum, N2, O2) using density functional theory. These theoretical calculations matched experimental results, indicating that the proposed approach is reasonable. |
Subject Area | 材料科学与物理化学 |
DOI | 10.1039/c6ra25505a |
Funding Organization | the National Natural Science Foundation of China (No. 51575253;51562020;51365026;51261014) |
Indexed By | SCI |
If | 3.108 |
Language | 英语 |
Funding Project | 纳米润滑研究组 |
compositor | 第二作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/21350 |
Collection | 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心 固体润滑国家重点实验室(LSL) |
Corresponding Author | Wang CB(王成兵); Zhang JY(张俊彦) |
Affiliation | 1.Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Xian 710021, Shaanxi, Peoples R China 2.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 3.Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China 4.Lanzhou Jiaotong Univ, Sch Mechatron Engn, Lanzhou 730070, Peoples R China |
Recommended Citation GB/T 7714 | Wang CB,Li, Bingrui,Ling, Xiaoming,et al. Superlubricity of hydrogenated carbon films in a nitrogen gas environment: adsorption and electronic interactions at the sliding interface[J]. RSC Advances,2017,7(5):3025-3034. |
APA | Wang CB,Li, Bingrui,Ling, Xiaoming,Zhang JY,王成兵,&张俊彦.(2017).Superlubricity of hydrogenated carbon films in a nitrogen gas environment: adsorption and electronic interactions at the sliding interface.RSC Advances,7(5),3025-3034. |
MLA | Wang CB,et al."Superlubricity of hydrogenated carbon films in a nitrogen gas environment: adsorption and electronic interactions at the sliding interface".RSC Advances 7.5(2017):3025-3034. |
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