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Superior macro-scale tribological performance of steel contacts based on graphene quantum dots in aqueous glycerol
ID
Nadeem, Irfan
(
Author
),
ID
Malok, Matjaž
(
Author
),
ID
Kovač, Janez
(
Author
),
ID
Yaqub, Talha Bin
(
Author
),
ID
Cavaleiro, Albano
(
Author
),
ID
Kalin, Mitjan
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0301679X23001159
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Abstract
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.
Language:
English
Keywords:
graphene
,
graphene quantum dots
,
graphite
,
aqueous glycerol
,
super-low friction
,
green tribology
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2023
Number of pages:
15 str.
Numbering:
Vol. 181, art. 108328
PID:
20.500.12556/RUL-148685
UDC:
539.92
ISSN on article:
1879-2464
DOI:
10.1016/j.triboint.2023.108328
COBISS.SI-ID:
144799747
Publication date in RUL:
29.08.2023
Views:
833
Downloads:
116
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Record is a part of a journal
Title:
Tribology international
Shortened title:
Tribol. int.
Publisher:
Elsevier
ISSN:
1879-2464
COBISS.SI-ID:
62108419
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
grafen
,
grafenske kvantne pike
,
grafit
,
vodni glicerol
,
super nizko trenje
,
zelena tribologija
Projects
Funder:
EC - European Commission
Funding programme:
H2020
Project number:
860246
Acronym:
GreenTRIBOS
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0231
Name:
Tribologija
Funder:
ARRS - Slovenian Research Agency
Project number:
PR-11224
Funder:
ARRS - Slovenian Research Agency
Project number:
P1-0099
Name:
Fizika mehkih snovi, površin in nanostruktur
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