MXenes Etching Method and Dispersion in Organic Solvents

doi:10.19894/j.issn.1000-0518.230064

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (7): 1044-1053.DOI: 10.19894/j.issn.1000-0518.230064

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MXenes Etching Method and Dispersion in Organic Solvents

Wen-Wen MA¹^,², Tong-Yang LI¹, Hua-Guo TANG¹, Zhu-Hui QIAO¹()

^1.State Key Laboratory of Solid Lubrication，Lanzhou Institute of Chemical Physics，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100039，China

Received:2023-03-17 Accepted:2023-06-02 Published:2023-07-01 Online:2023-07-19
Contact: Zhu-Hui QIAO
About author:zhqiao@licp.cas.cn
Supported by:
the Shandong Provincial Natural Science Foundation(ZR2021JQ20);the National Key R&D Program of China(2022YFB3706204)

Abstract

Abstract:

MXenes is a hydrophilic two-dimensional inorganic materialand has a wide range of dispersion properties and application characteristics through the regulation of its morphology and surface end-group. The etching method and dispersibility in organic solvents are studied. It is found that Al as the “A” layer of the MAX phase is more likely to be etched to form Ti₃C₂T _x . Multilayer Ti₃C₂T _x can be obtainedby HF etching. Etching of MAX by in situ generated HF from HCl+LiFis more likely to obtain single layer Ti₃C₂T _x solution. DMF and other organic solvents as dispersants can change Ti₃C₂T _x from hydrophilic to hydrophobic， and Ti₃C₂T _x can effectively dispersed in lubricating oil as the dispersant aid. Ti₃C₂T _x modified with dodecyl phosphate shows a better hydrophobicity with the water contact angle of higher than 90（°）， which can be used to prepare higher concentration Ti₃C₂T _x -lubricating oil dispersion. This research provides a broad idea and a solid foundation for the application of MXenes in organic dispersion and lubricant additives.

Key words: MXenes, Etch, Auxiliary dispersion, Surface-modified, Hydrophilic

CLC Number:

O614

Wen-Wen MA, Tong-Yang LI, Hua-Guo TANG, Zhu-Hui QIAO. MXenes Etching Method and Dispersion in Organic Solvents[J]. Chinese Journal of Applied Chemistry, 2023, 40(7): 1044-1053.

Figures/Tables 9

Fig.1 XRD patterns and SEM photos of Ti3AlC2 and Ti3SiC2

Fig.2 SEM images of HF-etched Ti3AlC2 （A），（B），（C） and Ti3SiC2 （D），（E），（F） at 6， 12 and 24 h

Fig.3 （A） Monolayer solution dindahl effect and （B） XRD patterns of Ti3AlC2 and Ti3SiC2 after HF etching

Fig.4 The distribution and content of multilayer Ti3C2T x elemental plane of （A） Ti3AlC2，（B） Ti3SiC2 etched by HF

Fig.5 The SEM morphologies of multilayer and single-layer MXenes etched by HCl+LiF for 24 h of Ti3AlC2（A， B） and （C， D） Ti3SiC2

Fig.6 （A） Monolayer solution dindahl effect and （B） the monolayer and multilayer MXenes XRD patterns of Ti3AlC2 and Ti3SiC2 after HCl+LiF etching

Fig.7 Water contact angle and solution images of H2O-M， DMF-M， NMP-M and DMSO-M

Fig.8 （A， B） Images and （C， D） transparency curves of DMF， NMP and DMSO-assisted MXenes dispersed in 5750 and OSP-46

Fig.9 （A） Images and （B） transparency scatter diagram at 400 nm wavelength of alkyl phospho-modified MXenes dispersed in OSP-46， 500N， PAO10， and 5750 and the water contact angle of P-M-OSP-46

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MXenes Etching Method and Dispersion in Organic Solvents

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