Zhao Liang, Bi Lingyi, Hu Jiayue, Gao Guanhui, Zhang Danzhen, Li Yun, Flynn Aidan, Zhang Teng, Wang Ruocun, Cheng Xuemei M, Liu Ling, Gogotsi Yury, Li Bo
Hybrid Nano-Architectures and Advanced Manufacturing Laboratory, Department of Mechanical Engineering, Villanova University, Villanova, PA, USA.
A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA.
Nat Commun. 2024 Nov 25;15(1):10027. doi: 10.1038/s41467-024-53840-y.
Two-dimensional carbides and nitrides, known as MXenes, are promising for water-processable coatings due to their excellent electrical, thermal, and optical properties. However, depositing hydrophilic MXene nanosheets onto inert or hydrophobic polymer surfaces requires plasma treatment or chemical modification. This study demonstrates a universal salt-assisted assembly method that produces ultra-thin, uniform MXene coatings with exceptional mechanical stability and washability on various polymers, including high-performance polymers for extreme temperatures. The salt in the TiCT colloidal suspension reduces surface charges, enabling electrostatically hydrophobized MXene deposition on polymers. A library of salts was used to optimize assembly kinetics and coating morphology. A 170 nm MXene coating can reduce radiation temperature by ~200 °C on a 300 °C PEEK substrate, while the coating on Kevlar fabric provides comfort in extreme conditions, including outer space and polar regions.
二维碳化物和氮化物，即MXenes，因其优异的电学、热学和光学性能，有望用于可进行水处理的涂层。然而，将亲水性MXene纳米片沉积到惰性或疏水性聚合物表面需要进行等离子体处理或化学改性。本研究展示了一种通用的盐辅助组装方法，该方法可在包括耐高温高性能聚合物在内的各种聚合物上制备出具有出色机械稳定性和可洗性的超薄、均匀的MXene涂层。TiCT胶体悬浮液中的盐降低了表面电荷，使静电疏水化的MXene能够沉积在聚合物上。使用了一系列盐来优化组装动力学和涂层形态。在300°C的聚醚醚酮（PEEK）基材上，170纳米厚的MXene涂层可将辐射温度降低约200°C，而凯夫拉织物上的涂层在包括外层空间和极地地区在内的极端条件下能提供舒适感。
