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Superior macro-scale tribological performance of steel contacts based on graphene quantum dots in aqueous glycerol
ID Nadeem, Irfan (Avtor), ID Malok, Matjaž (Avtor), ID Kovač, Janez (Avtor), ID Yaqub, Talha Bin (Avtor), ID Cavaleiro, Albano (Avtor), ID Kalin, Mitjan (Avtor)

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Izvleček
Reducing friction is one of the best ways to lower energy consumption and make processes more environmentally friendly. Because of the growing interest in green lubricants, we investigated the synergetic effects of graphene quantum dots (GQDs) combined with aqueous glycerol to improve the lubrication performance of self-mated steel contacts in reciprocating sliding motion. As a comparison, the lubrication performance of some other two-dimensional (2D) graphitic materials (graphite, graphene oxide, and graphene nanoplatelets) was also studied. The results demonstrate that the GQDs-based nano-lubricant reduces the running-in period and provides super-low friction at a high contact pressure in the boundary-lubrication regime, with 72% and 53% improvements in anti-friction and anti-wear performance compared with aqueous glycerol. On the other hand, the 2D graphitic materials provide super-low friction in the mixed-lubrication regime due to the dominant polishing effect of the hydroxyl groups. The surface Raman mapping indicates that the 2D graphitic materials were severely damaged by the continuous reciprocating motion owing to their inferior crack resistance. In contrast, the superior deformation resistance of the GQDs helps to develop a tough tribofilm. This lubrication mechanism suggests that internal shearing of graphene layers inside the GQDs significantly reduces the wear and friction during the running-in period, while the in-situ formation of strongly adhered tough tribofilm with more surface coverage contributed to the realization of super-low friction under a high contact pressure. This study demonstrated that GQDs-based green nano-lubricants could provide super-low friction at a high contact pressure in the boundary-lubrication regime, which was so far characteristic mainly for conventional environment-polluting lubricants.

Jezik:Angleški jezik
Ključne besede:graphene, graphene quantum dots, graphite, aqueous glycerol, super-low friction, green tribology
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2023
Št. strani:15 str.
Številčenje:Vol. 181, art. 108328
PID:20.500.12556/RUL-148685 Povezava se odpre v novem oknu
UDK:539.92
ISSN pri članku:1879-2464
DOI:10.1016/j.triboint.2023.108328 Povezava se odpre v novem oknu
COBISS.SI-ID:144799747 Povezava se odpre v novem oknu
Datum objave v RUL:29.08.2023
Število ogledov:1955
Število prenosov:120
Metapodatki:XML DC-XML DC-RDF
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Gradivo je del revije

Naslov:Tribology international
Skrajšan naslov:Tribol. int.
Založnik:Elsevier
ISSN:1879-2464
COBISS.SI-ID:62108419 Povezava se odpre v novem oknu

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:grafen, grafenske kvantne pike, grafit, vodni glicerol, super nizko trenje, zelena tribologija

Projekti

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:860246
Akronim:GreenTRIBOS

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0231
Naslov:Tribologija

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:PR-11224

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P1-0099
Naslov:Fizika mehkih snovi, površin in nanostruktur

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