Enhanced lubricity and anti-wear performance of zwitterionic polymer-modified N-enriched porous carbon nanosheets as water-based lubricant additive

Lu, Qi; Zhang, Tingting; He, Baoluo; Xu, Fei; Liu, Shujuan; Ye, Qian; Zhou, Feng

doi:10.1016/j.triboint.2021.107421

Cited by 46 publications

(23 citation statements)

References 44 publications

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“…As shown in Figure a, there were three characteristic fitting peaks in the C 1s fine spectra, assigned to C–O near 289.7 eV, C–C near 285.0 eV, and C–Fe near 283.4 eV, respectively. Among them, C–O represented the organic part in the tribofilm, part of which was generated in the tribochemical reaction, and the others derived from the deposition of B,N@PCNS . The C–C corresponded to amorphous carbon with sp 3 hybridization; on the one hand, the B,N@PCNS possessed pretty poor crystallinity and presented an amorphous feature, and on the other hand, the products produced in the tribochemical reaction usually emerged in an amorphous state, which was in accordance with the conclusion from the Raman mappings .…”

Section: Resultssupporting

confidence: 79%

Boron–Nitrogen Codoped Carbon Nanosheets as Oil-Based Lubricant Additives for Antioxidation, Antiwear, and Friction Reduction

Zhang

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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Leveraging the advantages of shape retention and atomic reconstruction during the carbonizing of crystalline precursors, we demonstrated an efficient strategy to manufacture boron–nitrogen codoped carbon nanosheets (B,N@PCNS) by virtue of pyrolysis combining metal–organic framework (MOF) precursors and B-dopants. Through the regulation of the ratio between reactants, we implemented an ultrahigh-surface heteroatomic doping rate of N at 10.44 atom % and B at 5.60 atom % with homogeneous distribution, which significantly enhanced the compatibility between carbon nanosheets and the lubricant oil PAO10, resulting in outstanding dispersion stability. Expectedly, the hybrid oil with 2.0 wt % B,N@PCNS displayed fascinating tribological performances in multiple aspects: it lowered the mean coefficient of friction to 0.088, promoted the load-carrying ability from 100 to 400 N, and diminished the wear loss by 91.3%. What is most laudable was the dramatic antioxidation property brought about by B doping; the unique radical scavenging effect of B atoms can restrain the decomposition of oil molecules, consequently prolonging the oxidative induction time from 15.7 min of PAO10 to exceeding 90 min with B,N@PCNS and promoting the onset oxidative temperature by 31.4 °C. With the aid of Raman mapping and XPS sputtering analysis, we verified that a complex tribochemical reaction occurred between B,N@PCNS and the steel substrate and induced the formation of a robust protective tribofilm composed of iron oxides, boron oxides, iron borides, and an amorphous carbonaceous compound. Among these, the rigid boron oxides and iron borides pervaded the whole tribofilm and strengthened it as a reinforcing phase, accounting for the tremendous boost in load-carrying and antiwear performances. This work not only puts forward a novel path in the synthesis of multidoped carbon nanosheets with tailored properties but also broadens the cognition of the tribochemical reaction via intuitive characterization.

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Section: Resultssupporting

confidence: 79%

Boron–Nitrogen Codoped Carbon Nanosheets as Oil-Based Lubricant Additives for Antioxidation, Antiwear, and Friction Reduction

Zhang

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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“…As shown in Figure 7a, the three peaks at 284.8, 286.4, and 288.8 eV in the fine spectrum of C 1s are assigned to the C−C/C�C, C− O/N, and C�O/N chemical structures, respectively, 48 which echo those of powdery PEIS@OLC, proclaiming its adsorption and deposition effect on friction pairs. The peaks of N 1s (Figure 7b) at 397.2, 400.0, and 401.2 eV can be ascribed to Si 3 N 4 , C−N/N−H in organic matter and C−N + bonds on the PEIS polymer, respectively, 40,49 corresponding well with the signals in C 1s and Si 2p spectra. In Figure 7c,d, two signal peaks at 530.0 and 531.7 eV fitted in the O 1s spectrum combined with the peaks of Fe 2p at 707.9, 711.7, and 719.4 eV are identified as iron hydroxides and oxides, suggesting the occurrence of oxidation reaction of an iron substrate under shear force and frictional heat generation.…”

Section: ■ Results and Discussionmentioning

confidence: 78%

Fabrication of Zwitterionic Polymer-Functionalized Onion-like Carbon Nanoparticles as Aqueous Lubricant Additives

Zhang,

Xie

et al. 2023

Langmuir

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Onion-like carbon (OLC) is a kind of carbon material with a graphene-like structure and large interlayer spacing, favorable to a good lubricating performance. Herein, a facile method is presented for the preparation of functionalized OLC nanoparticles from candle soot with surface modification. The OLC nanoparticles are collected from combustion soot with candle burning via a simple heat treatment, and then the zwitterionic polymer (polyethylenimine-quaternized derivative, PEIS) can self-assemble onto the OLC surface with epigallocatechin gallate via Michael addition and Schiff-base reaction, thus obtaining PEIS-functionalized OLC nanoparticles (PEIS@OLC). The grafting zwitterionic polymer PEIS endows the OLC nanoparticles with good hydrophilic performance, so the as-obtained PEIS@OLC exhibits outstanding dispersion and lubricating property as a water-based lubricant additive. Compared to pure water, the average coefficient of friction decreases to 0.110 from 0.512, and the corresponding wear volume is reduced by 61.02% with 1.5 wt % addition. The improved lubricating property is mainly due to the synergetic effect of the protective film induced by the tribochemical reaction and the hydration film of zwitterionic polymer PEIS. Besides, the OLC nanoparticles could also display the nanoscale rolling and repairing effects at the friction contact interface, resulting in reduction of friction and wear.

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“…13 In addition, there was also the tensile vibration of −CN at 1319 cm −1 . 31 These two absorption bands proved the successful doping of nitrogen. The chemical composition of NCDs was further analyzed by XPS spectra.…”

Section: ■ Results and Discussionmentioning

confidence: 91%

“…However, the interaction between the remaining N atoms at the edge of the carbon material also resulted in an absorption peak near 3433 cm –1 , so the stretching vibration of N–H may also occur near the 3433 cm –1 absorption peak . In addition, there was also the tensile vibration of −CN at 1319 cm –1 . These two absorption bands proved the successful doping of nitrogen.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped Carbon Dot as a Lubricant Additive in Polar and Non-polar Oils for Superior Tribological Properties via Condensation Reaction

et al. 2023

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Nitrogen-doped lubricating additives have been proved to be an effective strategy to improve the tribological properties of lubricating oil. However, the traditional preparation methods of nitrogen-doped lubricating additives have the defects including harsh preparation conditions and a time-consuming preparation process. Herein, we report a preparation method of nitrogen-doped carbon dot (NCD) lubricating additives in a short time by one-step aldehyde condensation reaction at room temperature. The small size effect and nitrogen-containing functional groups of NCD lubricating additives provide favorable conditions for their dispersion and low friction in base oil. The tribological properties of NCD lubricating additives in sunflower oil (SFO) and PAO10 were systematically evaluated. The results show that NCD lubricating additives could reduce the average friction coefficient of SFO from 0.15 to 0.06 and PAO10 oil from 0.12 to 0.06, and the wear width is also decreased by 50–60%. In particular, the friction curve is very stable, and the friction coefficient was maintained at about 0.06 even under the working time of 5 h. By analyzing the morphology and chemical properties of the worn surface, the lubrication effect of NCDs is attributed to its small size effect and adsorption, which was easy to enter the friction gap to fill and repair. Furthermore, the doping of nitrogen induces the occurrence of friction chemical reactions, forming a friction film of nitrides and metal oxides at the friction interface, which effectively reduces the friction and wear of the surface. These findings provide a possibility for the convenient and effective preparation of NCD lubricating additives.

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Enhanced lubricity and anti-wear performance of zwitterionic polymer-modified N-enriched porous carbon nanosheets as water-based lubricant additive

Cited by 46 publications

References 44 publications

Boron–Nitrogen Codoped Carbon Nanosheets as Oil-Based Lubricant Additives for Antioxidation, Antiwear, and Friction Reduction

Boron–Nitrogen Codoped Carbon Nanosheets as Oil-Based Lubricant Additives for Antioxidation, Antiwear, and Friction Reduction

Fabrication of Zwitterionic Polymer-Functionalized Onion-like Carbon Nanoparticles as Aqueous Lubricant Additives

Nitrogen-Doped Carbon Dot as a Lubricant Additive in Polar and Non-polar Oils for Superior Tribological Properties via Condensation Reaction

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