Covalently attached strategy to modulate surface of carbon quantum dots: Towards effectively multifunctional lubricant additives in polar and apolar base fluids

Ye, Mengting; Cai, Tao; Zhao, Lina; Liú, Dan; Liu, Shenggao

doi:10.1016/j.triboint.2019.03.045

Cited by 38 publications

(15 citation statements)

References 39 publications

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“…With combination of the above results, the formation of WO 2 could play an important role in friction‐reduction, friction‐induced WO 3 exhibits good anti‐wear performance, and the formation of carbon quantum dots could effectively enhance the anti‐wear and friction‐reduction as reported in previous work, 23–28 and carbon quantum dots with graphite‐like characteristics can also contribute to low friction 29 . Besides, we examine the viscosity of the mixed lubricant before and after tribological test; the viscosity is calculated as 1.55 and 1.12 mPa⋅s, respectively.…”

Section: Resultsmentioning

confidence: 59%

Tribochemistry of phenol and benzyl alcohol between YG8 self‐mated interfaces

Zhang

Luo

et al. 2022

Surface & Interface Analysis

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In this work, the tribological performance of mixed lubricant consisting of phenol and benzyl alcohol between YG8 self‐mated interfaces was systematically investigated under 98 N and 1450 rpm. The results showed that with increasing concentration of phenol in the mixed lubricant, the friction coefficient initially decreases and then increases; however, anti‐wear performance initially was enhanced and then weaken. As the concentration of phenol was 1.0 wt.%, the tribo‐system exhibited the lowest friction coefficient and wear scar diameter. TEM, SEM and XPS techniques were employed to probe the possible tribological mechanism sliding in the mixed lubricant containing 1.0 wt.% of phenol. The phenol effectively slowed down the oxidation of the mixed lubricant, combination of friction‐induced tungsten oxides and carbon quantum dots, assuring the tribo‐system still in mixed lubrication condition, which made the tribo‐system maintain low friction coefficient and wear.

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Section: Resultsmentioning

confidence: 59%

Tribochemistry of phenol and benzyl alcohol between YG8 self‐mated interfaces

Zhang

Luo

et al. 2022

Surface & Interface Analysis

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“…It was confirmed that the well-dispersed CDs-IL with a low dosage could observably improve the friction-reducing property, antiwear capability, and service life of PEG200 . Moreover, our previous studies demonstrated the feasibility of using starlike poly(ionic liquid)s and hyperbranched polyelectrolyte-grafted CDs as additives for heightening the tribological performance of PEG200. − Cai and colleagues proposed that the aliphatic chain- and IL-grafted CDs can serve as effective friction modifiers for PEG200. − Surprisingly, when only 1.0 wt % of the CD-ILs was introduced, the friction-reducing and antiwear performances of base oil can be improved by 90 and 62%, respectively, forcefully indicating the economic feasibility of CD-based friction modifiers in saving energy. He et al reported in situ fabrication of CDs/PEG200 lubricants with superb lubricity using a facile ultrasonic route .…”

Section: Introductionmentioning

confidence: 86%

“…Carbon dots (CDs), an intriguing carbonaceous nanomaterial, have received tremendous focus in optoelectronics, nanomedicine, energy storage/conversion, and so on, because of their intrinsic low toxicity, fantastic biocompatibility, photostability, and charge/electron transfer/acceptance efficiency. − Recently, CDs have attracted increasing attention in tribology , because of their unique peculiarities including tiny and uniform dimensions (<10 nm), copious groups, and ideal designability, which enable CDs to act as antiwear and friction-reducing additives for PEG. Previously, many efforts have been made to endow CDs with high dispersibility and durable stability in PEG. − Wang et al prepared ionic liquid (IL)-decorated CDs (CDs-IL) via one-pot pyrolysis and anion exchange and systematically investigated the antiwear and friction-reducing abilities of the CDs-IL as the friction modifiers for PEG200. It was confirmed that the well-dispersed CDs-IL with a low dosage could observably improve the friction-reducing property, antiwear capability, and service life of PEG200 .…”

Section: Introductionmentioning

confidence: 99%

Scalable and Sustainable Synthesis of Carbon Dots from Biomass as Efficient Friction Modifiers for Polyethylene Glycol Synthetic Oil

Mou

Yang

Zhao

et al. 2021

ACS Sustainable Chem. Eng.

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Carbon dots (CDs) have lately inspired extensive interest in tribology, especially in the field of friction modifiers. However, it remains an enormous challenge to obtain satisfactory compatibility between CDs and base oils without laborious and tedious chemical modifications. In this work, for the first time, we reported a scalable and sustainable synthesis of CDs from easily and cheaply available biomass via a one-pot solvothermal route, which used ethanol as the renewable reaction medium and H 2 O 2 as the clean oxidant. Typically, ginkgo leaves acting as the precursors were converted into CDs with an ultrahigh yield of 85.3%. As expected, the ginkgo leaf-derived CDs, abbreviated as GCDs, displayed excellent dispersibility, durable stability, and attractive fluorescence-emission behavior in PEG200. The as-prepared GCDs as additives for PEG200 exhibited remarkable lubricity, favorable loadcarrying ability, and long operating life under boundary lubrication. Particularly, the antiwear and friction-reducing performances of PEG200 were promoted by 70.5% and 34.7%, respectively, when only 0.20 wt % of GCDs was blended. Confirmed by the tribological investigations and surface detection of wear tracks, the essential lubrication mechanism of GCDs was chiefly associated with the generation of GCD-inserted tribochemical films with a thickness of about 80 nm and their nanolubrication functions, that is, the synergistic effects of surface organic moieties and carbonaceous cores. This study establishes a technically simple, feasible, versatile, cost-effective, and green methodology to produce CD-based friction modifiers toward PEG synthetic base oils for tribological applications.

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“…Briefly, the surface functional groups of CQDs could not only improve their physicochemical properties but also promote their embedding stability and film-forming ability on the rubbing surfaces. As a result, adjusting and controlling the surface functional groups of CQDs has long been considered as a primary approach for enhancing their tribological performance [125][126][127][128][129]. CQDs have ideally spherical or quasi-spherical shapes with a relatively narrower particle size distribution, and CQDs can easily enter into the rubbing surfaces and be deposited thereon to form a surface protective film under high frictional temperature and contact pressure, thereby preventing the direct contact of the rubbing surfaces and effectively reducing friction and wear.…”

Section: The Superiority Of Cqds As Lubricant Additivesmentioning

confidence: 99%

Applications of carbon quantum dots in lubricant additives: a review

Tang

Zhang

2021

J Mater Sci

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Advances in lubricants are vital to the pursuit of energy efficiency and sustainable development. It is well known that the essence of lubricating oil is lubricant additives, especially the friction-reducing and anti-wear additives. Carbon quantum dots (CQDs), a novel zero-dimensional carbon-based nanomaterial, have attained growing expectations in material and chemical sciences because of their extraordinary properties such as low toxicity and environmentally friendly, high chemical and thermal stability, and good designability. Since their discovery, CQDs have shown great potential in many applications including sensors, medicine, photovoltaic devices, biology, and tribology. The latest application of CQDs as the high-performance friction-reducing and antiwear additives has garnered increasing attention. With the in-depth study, CQDs have gradually exhibited their excellent tribological properties, especially acted as additives in lubricating base oils. This paper has reviewed the progress in the research and development of CQDs-based lubricant additives by introducing lots of successful applications of CQDs-based additives in the present work and then highlighted the friction-reducing and anti-wear property, superiority, as well as the lubrication mechanism of CQDs as an additive, along with some discussion on challenges and perspectives in this significant and promising field. Finally, we offered a series of suggestions for developing the next-generation high-performance CQDs-based lubricant additives.

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Covalently attached strategy to modulate surface of carbon quantum dots: Towards effectively multifunctional lubricant additives in polar and apolar base fluids

Cited by 38 publications

References 39 publications

Tribochemistry of phenol and benzyl alcohol between YG8 self‐mated interfaces

Tribochemistry of phenol and benzyl alcohol between YG8 self‐mated interfaces

Scalable and Sustainable Synthesis of Carbon Dots from Biomass as Efficient Friction Modifiers for Polyethylene Glycol Synthetic Oil

Applications of carbon quantum dots in lubricant additives: a review

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