Friction of Ti 3 C 2 T x MXenes.

Autor:	Serles P; Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada., Hamidinejad M; Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.; Department of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge, United Kingdom, CB3 0FS.; Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720, United States., Demingos PG; Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada., Ma L; Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada., Barri N; Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada., Taylor H; Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720, United States., Singh CV; Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada., Park CB; Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada., Filleter T; Department of Mechanical & Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2022 Apr 27; Vol. 22 (8), pp. 3356-3363. Date of Electronic Publication: 2022 Apr 06.
DOI:	10.1021/acs.nanolett.2c00614
Abstrakt:	2D materials are well-known for their low-friction behavior by modifying the interfacial forces at atomic surfaces. Of the wide range of 2D materials, MXenes represent an emerging material class but their lubricating behavior has been scarcely investigated. Herein, the friction mechanisms of 2D Ti 3 C 2 T x MXenes are demonstrated which are attributed to their surface terminations. We find that Ti 3 C 2 T x MXenes do not exhibit the well-known frictional layer dependence of other 2D materials. Instead, the nanoscale lubricity of 2D MXenes is governed by the termination species resulting from synthesis. Annealing the MXenes demonstrate a 7% reduction in OH termination which translates to a 16-57% reduction of friction in agreement with DFT calculations. Finally, the stability of MXene flakes is demonstrated upon isolation from their aqueous environment. This work indicates that MXenes can provide sustainable lubricity at any thickness which makes them uniquely positioned among 2D material lubricants.
Databáze:	MEDLINE
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