Zhang Xiaozhi, Wang Yi, Wang Tiantian, Xue Shenghua, Liu Shujuan, Ye Qian, Zhou Feng
State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.
Langmuir. 2024 Oct 22;40(42):22159-22167. doi: 10.1021/acs.langmuir.4c02652. Epub 2024 Oct 8.
In previous reports, covalent organic frameworks (COFs) have demonstrated significant potential as lubricant additives. Herein, we embedded Ag nanoparticles in the DT-COF (polycondensation polymer of 2,5-dihydroxyterephthalaldehyde and 4,4',4″-(1,3,5-triazine-2,4,6-triyl) trianiline) matrix via the ball milling method and utilized this composite (Ag@DT-COF) as an additive for supermolecule oil gel. The low molecular weight gelator effectively mitigates the dispersion challenges of COFs in lubricant oil, while the embedded Ag nanoparticles enhance the repairing effect and antipressure performance of the lubricant. The resulting Ag@DT-COF gel exhibits a reduction in the average friction coefficient and wear volume of base oil by 46.0% and 87.5%, respectively, and increases the load-carrying capacity to 750 N. The remarkable tribological properties are attributed to the easy adsorption of DT-COF, antiwear characteristic of Ag nanoparticles, and the gelator that ensures the long-term stability of oil gel.
在先前的报道中，共价有机框架（COFs）已显示出作为润滑剂添加剂的巨大潜力。在此，我们通过球磨法将银纳米颗粒嵌入DT-COF（2,5-二羟基对苯二甲醛与4,4',4″-(1,3,5-三嗪-2,4,6-三基)三苯胺的缩聚聚合物）基质中，并将这种复合材料（Ag@DT-COF）用作超分子油凝胶的添加剂。低分子量凝胶剂有效缓解了COFs在润滑油中的分散难题，而嵌入的银纳米颗粒增强了润滑剂的修复效果和抗压性能。所得的Ag@DT-COF凝胶使基础油的平均摩擦系数和磨损体积分别降低了46.0%和87.5%，并将承载能力提高到750 N。这些卓越的摩擦学性能归因于DT-COF的易吸附性、银纳米颗粒的抗磨特性以及确保油凝胶长期稳定性的凝胶剂。
