Wang Peng, He Baoluo, Zhang Xiaozhi, Liu Shujuan, Ye Qian, Zhou Feng, Liu Weimin
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, P.R. China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R. China.
ACS Appl Mater Interfaces. 2023 Dec 6;15(48):56192-56202. doi: 10.1021/acsami.3c13756. Epub 2023 Nov 24.
In this study, size-regulated MOFs (MZ) with high MBT loading were successfully synthesized by combining mercaptobenzothiazole (MBT), zinc salt, and 2-methylimidazole (2-MI). Subsequently, the MZ structure was utilized to encapsulate tannic acid-modified gallium-based liquid metal (GLM-TA), thereby acquiring a novel heterogeneous nanocomposite (GLM-TA@MZ). The results revealed that the as-prepared GLM-TA@MZ shows good antiwear and friction-reducing performance as an oil-based lubricant additive, the average friction coefficient was decreased to 0.091, and a wear volume was reduced to 0.95 × 10 μm, which corresponds to a decrease of 52.3 and 97.2% as compared to base oil PAO. The excellent tribological properties of GLM-TA@MZ can be attributed to physical adsorption on the friction pair, followed by tribochemical reactions. As a result, a thick friction protection film (thickness of about 100 nm) containing Ga, Zn, and S elements was formed, which effectively reduced the contact area between the friction pairs, resulting in improved tribological performance. This study provides insights into the design of MOF-based nanocomposites for lubricating applications.
在本研究中，通过将巯基苯并噻唑（MBT）、锌盐和2-甲基咪唑（2-MI）相结合，成功合成了具有高MBT负载量的尺寸可调金属有机框架材料（MZ）。随后，利用MZ结构封装单宁酸修饰的镓基液态金属（GLM-TA），从而获得一种新型的异质纳米复合材料（GLM-TA@MZ）。结果表明，所制备的GLM-TA@MZ作为油基润滑添加剂表现出良好的抗磨减摩性能，平均摩擦系数降至0.091，磨损体积降至0.95×10μm，与基础油PAO相比，分别降低了52.3%和97.2%。GLM-TA@MZ优异的摩擦学性能可归因于在摩擦副上的物理吸附，随后发生摩擦化学反应。结果，形成了一层含有Ga、Zn和S元素的厚摩擦保护膜（厚度约为100nm），有效减小了摩擦副之间的接触面积，从而提高了摩擦学性能。本研究为基于金属有机框架材料的润滑应用纳米复合材料的设计提供了见解。
