单层
湿度
润滑油
材料科学
相对湿度
润滑
化学工程
吸附
表面改性
分子
自组装单层膜
图层(电子)
纳米技术
复合材料
有机化学
化学
物理
工程类
热力学
作者
Kaihuan Yu,Junhui Ren,Wenjian Liao,Bo Hu,C. Bai,Zhihui Li,Xingkai Zhang,Muhammad Chhattal,Ning Li,Qiang Li
出处
期刊:Small
[Wiley]
日期:2024-06-27
标识
DOI:10.1002/smll.202402143
摘要
Abstract MXene is considered as a promising solid lubricant due to facile shearing ability and tuneable surface chemistry. However, it faces challenges in high‐humidity environments where excessive water molecules can significantly impact its 2D structure, thus deteriorating its lubricating properties. In this work, the self‐assembled monolayers are formed on MXene by surface chlorination (MXene‐Cl) and fluorination (MXene‐F), and their friction behaviors in high/low humidity are investigated. The results indicate that MXene‐F and MXene‐Cl can maintain a relatively constant friction coefficient (CoF) (MXene‐F ∼0.76, MXene‐Cl ∼0.48) under both high (75%) and low (25%)‐relative humidity (RH) environments. Meanwhile, the MXene‐F and MXene‐Cl display a lower CoF than the pristine MXene (MXene CoF∼1.18) in high humidity. The above phenomena are mainly attributed to the preservation of its 2D layered structure, the increased layer spacing, and superficial partial oxidation for SAMs‐functionalized MXene under high humidity during friction. Interestingly, MXene‐Cl with moderate water resistance has a lower CoF than that of MXene‐F with complete water resistance. The nanostructured water adsorption capacity and larger interlayer spacing of MXene‐Cl make it exhibit a lower CoF compared to MXene‐F. The findings of this study offer valuable guidance for tailoring MXene by surface chemical functionalization as an efficient solid lubricant in high humidity.
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