One-pot pyrolysis preparation of carbon dots as eco-friendly nanoadditives of water-based lubricants

Hu, Yiwen; Wang, Yongxin; Wang, Chunting; Ye, Yuwei; Zhao, Haichao; Li, Jinlong; Lu, Xiaojiang; Mao, Chunlong; Chen, Shanjun; Jin-ming, Mao; Wang, Liping; Xue, Qunji

doi:10.1016/j.carbon.2019.06.047

Cited by 75 publications

(33 citation statements)

References 41 publications

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“…However, the increase in the contact area was lower than that of the load. In comparison with previously reported carbon/graphene quantum dots [57][58][59], colloidal polystyrene-carbon nanotubes [60], and graphene oxides [61,62], BPQDs possess a much better loadsupporting capacity under identical experimental conditions, even when using a small additive c of 0.005 wt%. For comparison purposes, BP powder was also utilized as additive of the base liquid to further highlight the superior performance of BPQDs as additives.…”

Section: Tribological Properties Of Bpqds As Waterbased Additivesmentioning

confidence: 52%

“…The formed tribochemical film comprised iron oxides (FeO and Fe2O3), iron phosphate (FePO4), metal carbide (FeC), phosphorus oxide (P2O5), and organic compounds embedded with the BPQDs. The formed tribochemical film could effectively improve the friction-reducing and anti-wear effects of friction pairs by preventing the direct contact of rubbing surfaces [58,63,64]. Additionally, the BPQDs embedded into the tribochemical film may also function as ball-bearings, which provide nano-lubrication effects (such as mending, polishing and rolling effects) to further reduce friction and wear [14,65].…”

Section: Wear Track Surface Analyses and Lubrication Mechanismmentioning

confidence: 99%

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Black phosphorus quantum dots: A new-type of water-based high-efficiency lubricant additive

et al. 2020

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Black phosphorus quantum dots (BPQDs), obtained via a typical solution-based top-down method, were used as water-based lubricant additives. BPQDs exhibited remarkable friction reduction and anti-wear properties even at the ultra-low concentration of 0.005 wt%, which reduced the friction coefficient and wear volume of the base liquid by 32.3% and 56.4%, respectively. In addition, the load-supporting capacity of the base liquid increased from 120 N to over 300 N. BPQDs-based additives exhibited a relatively long lifetime at a relatively high load of 80 N. The performance of BPQDs considerably exceeded that of the BP; this may be attributed to their small and uniform particle size, good dispersion stability in water, and high reactivity at the frictional surfaces. The results of the surface wear resistance analysis demonstrated that a robust tribochemical film with a thickness of approximately 90 nm was formed on the rubbing surface lubricated with 0.005 wt% of BPQDs dispersion. Moreover, the film served as a direct evidence of the excellent tribological performance of BPQDs.

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Section: Tribological Properties Of Bpqds As Waterbased Additivesmentioning

confidence: 52%

Section: Wear Track Surface Analyses and Lubrication Mechanismmentioning

confidence: 99%

Black phosphorus quantum dots: A new-type of water-based high-efficiency lubricant additive

et al. 2020

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“…During the synthesis of C-dots using top-down approaches, harsh experimental conditions (e.g., strong acid and arc discharge), tedious operation steps and expensive equipment are usually employed, which greatly limit their practical application. The bottom-up approaches, such as the microwave-assisted method [ 29 , 30 , 31 ], pyrolysis [ 32 , 33 , 34 ], solvothermal method [ 35 , 36 , 37 ], ultrasonic method [ 38 , 39 , 40 ], on the contrary, convert small molecules into C-dots via carbonization and passivation. They have the advantages of cost-effectiveness, easy operation and simple equipment requirements, and hence have been widely used in the synthesis of C-dots.…”

Section: Introductionmentioning

confidence: 99%

A Review of Carbon Dots Produced from Biomass Wastes

et al. 2020

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The fluorescent carbon dot is a novel type of carbon nanomaterial. In comparison with semiconductor quantum dots and fluorescence organic agents, it possesses significant advantages such as excellent photostability and biocompatibility, low cytotoxicity and easy surface functionalization, which endow it a wide application prospect in fields of bioimaging, chemical sensing, environmental monitoring, disease diagnosis and photocatalysis as well. Biomass waste is a good choice for the production of carbon dots owing to its abundance, wide availability, eco-friendly nature and a source of low cost renewable raw materials such as cellulose, hemicellulose, lignin, carbohydrates and proteins, etc. This paper reviews the main sources of biomass waste, the feasibility and superiority of adopting biomass waste as a carbon source for the synthesis of carbon dots, the synthetic approaches of carbon dots from biomass waste and their applications. The advantages and deficiencies of carbon dots from biomass waste and the major influencing factors on their photoluminescence characteristics are summarized and discussed. The challenges and perspectives in the synthesis of carbon dots from biomass wastes are also briefly outlined.

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“…On the other hand, the carbon cores of CQDs exhibited captivating nanolubrication effects such as rolling, mending, and polishing effects to further reduce friction and wear. Recently, Hu et al [137] reported a facile and low-cost ''bottom-up'' procedure for the preparation of water-soluble CQDs by pyrolyzing ammonium citrate. The tribological properties and inhibition effect of the prepared CQDs as nanoadditives of water-based lubricants were discussed in detail.…”

Section: Cqds As Lubricant Additives Cqds As Additives In Water-based Lubricantsmentioning

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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One-pot pyrolysis preparation of carbon dots as eco-friendly nanoadditives of water-based lubricants

Cited by 75 publications

References 41 publications

Black phosphorus quantum dots: A new-type of water-based high-efficiency lubricant additive

Black phosphorus quantum dots: A new-type of water-based high-efficiency lubricant additive

A Review of Carbon Dots Produced from Biomass Wastes

Applications of carbon quantum dots in lubricant additives: a review

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