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  • Super-low friction and wear in steel contacts enabled by tribo-induced structural degradation of graphene quantum dots
    Nadeem, Irfan ...
    Reducing friction is a promising strategy to decrease material losses and energy consumption in industrial systems. However, in aqueous-lubricated steel contacts, the contact pressure rarely exceeds ... 50 MPa during super-low friction due to excessive wear. This work demonstrates that even in steel/steel contacts, by combining graphene quantum dots (GQDs) with aqueous glycerol, it is possible to maintain super-low friction (µ ≈ 0.012) under a contact pressure as high as 316.5 MPa. Moreover, the use of GQDs improved the wear performance by 98 % compared to pure aqueous glycerol due to the formation of a tribochemical film, resulting from the electrostatic adsorption of GQDs on the positively charged sites on the worn surface. In particular, the exfoliation of graphene sheets within GQDs, the shearing of graphene layers inside the GQDs, and the OH–OH repulsion between the asperities shortens the running-in period and consequently reduces the friction and wear. At the same time, the formation of a chemically adsorbed tribofilm containing friction-induced structurally degraded GQDs protects the surface from wear and facilitates the maintenance of super-low friction at high contact pressures by improving the load-carrying capacity. This study suggests that green nano-lubricants based on GQDs have immense potential in sustainable engineering.
    Vir: Materials & design. - ISSN 0264-1275 (Vol. 244, [article no.] 113111, Aug. 2024, str. 1-14)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2024
    Jezik - angleški
    COBISS.SI-ID - 200420867

    Povezava(-e):

    https://www.sciencedirect.com/science/article/pii/S0264127524004854
    Repozitorij Univerze v Ljubljani – RUL
    DOI

vir: Materials & design. - ISSN 0264-1275 (Vol. 244, [article no.] 113111, Aug. 2024, str. 1-14)
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