Constructing MXene quantum dots decorated covalent organic frameworks as oil-based lubricant additive  

构建MXene量子点修饰的共价有机框架材料作为油基润滑油添加剂

作　　者：Yichen Wang Fei Zhao Haoyuan Yang Ke Yang Tianyi Zhang Qian Ye Yibo He Xuqing Liu 王怡辰;赵飞;杨皓元;杨科;张天一;叶谦;贺亦柏;刘旭庆

机构地区：[1]State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,School of Materials Science and Engineering Northwester nPolytechnical University,Xi'an 710072,China

出　　处：《Science China Materials》2025年第4期1220-1229,共10页中国科学(材料科学)(英文版)

基　　金：supported by the National Natural Science Foundation of China(22109127);the China Postdoctoral Science Foundation(2021M702666);the Youth Project of"Shaanxi High-level Talents Introduction Plan",the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(2023-TS-02);the"Special Lubrication and Sealing for Aerospace"Shaanxi Provincial Science and Technology Innovation Team(2024RS-CXTD-63)。

摘　　要：Nanoadditives offer a promising way to reduce friction and wear.In this study,an organic-inorganic hybrid material composed of MXene quantum dots(MQDs)and cetyl trimethylammonium bromide decorated covalent organic frameworks(CNUS-2)is successfully constructed via an electrostatic self-assembly strategy.The combination of MQDs and CNUS-2 not only increases the interlayer spacing of NUS-2 but also mitigates the self-aggregation of MQDs,maximizing the advantages of their intrinsic characteristics.Owing to the synergistic lubrication effect of zero-dimensional MQDs and two-dimensional NUS-2,improved lubricity and interfacial bonding ability are realized.In addition,the relative slip between the CNUS-2@MQDs sheets can reduce friction and anti-wear.As expected,different levels of CNUS-2@MQDs effectively boost the tribological properties.The friction coefficient(0.097)and wear volume(1.48×10^(5)µm^(3))of PAO-10 oil are reduced by 46.7%and 92.6%respectively,after the introduction of the 3.0 wt%CNUS-2@MQDs nanocomposite.Furthermore,the abundant oxygen-containing functional groups in CNUS-2 can accelerate the formation of adsorption and tribochemical reaction films,whereas the MQDs can repair worn surfaces,resulting in superior lubrication performance under variable load,temperature,and frequency conditions.This work not only effectively improves lubrication performance by developing a unique CNUS-2@MQDs nanocomposite,but also provides a reference for the design of novel lubricant additives.纳米添加剂为减少摩擦副的摩擦和磨损提供了一种应用前景的方法.本文采用静电自组装策略,成功构建了一种由MXene量子点(MQDs)和十六烷基三甲基溴化铵所修饰共价有机框架(CNUS-2)组成的有机无机杂化材料.MQDs和CNUS-2的结合不仅拓宽了NUS-2的层间间距,还抑制了MQDs的自团聚,使其最大限度地发挥自身优势.零维MQDs和二维NUS-2之间的协同润滑效应使得润滑油的润滑性能和界面结合能力都得到了改善.同时,CNUS-2@MQDs片层之间的相对滑移也能减少摩擦和磨损.因此,引入不同含量的CNUS-2@MQDs均能有效提高摩擦学性能.当引入3.0 wt%的CNUS-2@MQDs纳米复合材料后,PAO-10油的摩擦系数(0.097)和磨损体积(1.48×10^(5)µm^(3))分别降低了46.7%和92.6%.此外,CNUS-2中丰富的含氧官能团能促进吸附膜和摩擦化学反应膜的形成,而MQDs则能修复磨损表面,在变载荷、变温、变频条件下获得优异的润滑性能.本研究通过发展CNUS-2@MQDs纳米复合材料,不仅有效地提高了润滑油的润滑性能,而且为设计新型润滑油添加剂提供了参考.

关 键 词：organic-inorganic hybrid material MXene quantum dots covalent organic frameworks electrostatically self-assembly synergistic lubrication 

分 类 号：TB3[一般工业技术—材料科学与工程]