Probing the Function of Solid Nanoparticle Structure under Boundary Lubrication

Fan, Xiaoqiang; Li, Wen; Fu, Hanmin; Zhu, Minhao; Wang, Liping; Cai, Zhenbing; Liu, Jianhua; Li, Hao

doi:10.1021/acssuschemeng.7b00213

Cited by 59 publications

(27 citation statements)

References 49 publications

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“…The carbon transfer film was produced on the face of dual ball wear scar, and a certain degree of graphitization occurred. [ 41 ] Different positions of the appearance of the wear scar show almost the same Raman spectrum shape, and the Raman spectrum peak at the C position of the wear scar is relatively strong. Therefore, it highlights the formation of graphite‐like carbon on the surface of the wear scar after sliding friction.…”

Section: Resultsmentioning

confidence: 99%

3D graphene/hexagonal boron nitride composite nanomaterials synergistically reduce the friction and wear of Steel‐DLC contacts

Wei

Chen

et al. 2021

Nano Select

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Green tribology is an engineering field, which is dedicated to reducing friction, wear and pollution to the environment. Diamond‐like carbon (DLC) films as coating is a very effective green friction material, but its friction of coefficient in the atmospheric environment still needs to be further reduced. Here, a common method for improving the tribological performance of DLC films in ambient atmosphere by adding 3D graphene/hexagonal boron nitride(h‐BN) composite nanomaterials as lubricant additive is proposed. By comparing with DLC film and other single additives, we can see that the 3D graphene/h‐BN composite nanomaterial as a lubricating additive reduce the friction coefficient and wear rate remarkably. By studying the tribological properties of the surface of the steel ball and DLC film, it is found that the friction protective film containing carbon, nitrogen and boron elements are formed on the surface. The presence of the friction layer can reduce friction efficiently, not only prevent the surface of the steel ball from being excessively worn, but also protect the DLC film from being damaged. The important thing is that it does not contain harmful elements and provides a new reference for the development of the next generation of oil‐free lubrication tribology. Accordingly, it is considered an environmentally friendly additive.

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Section: Resultsmentioning

confidence: 99%

3D graphene/hexagonal boron nitride composite nanomaterials synergistically reduce the friction and wear of Steel‐DLC contacts

Wei

Chen

et al. 2021

Nano Select

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“…These results imply that an LP lubricant film forms at a low load and is easily damaged at a high load [35], possibly owing to the increased friction and wear of the LP under a high load. BDS and NA-BDS-OLA can play a positive role in protecting the friction interfaces [36]; hence, they have favorable anti-friction and anti-wear effects, improving the LP tribological properties under a high load.…”

Section: Resultsmentioning

confidence: 99%

“…Second, both types of soot can act as a ball bearing between the friction pairs [31,46]. Finally, under a high load, the graphitic layers of both types of soot are prone to being exfoliated and adsorbed onto the friction interface, resulting in easy sliding and a good lubrication effect between the surfaces [36,47].…”

Section: Resultsmentioning

confidence: 99%

Novel Carbon Nanoparticles Derived from Biodiesel Soot as Lubricant Additives

Wang

et al. 2019

Nanomaterials

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The objective of this study was to investigate the roles and tribological mechanisms of onion-like carbon nanoparticles derived from biodiesel soot (BDS) when applied in water (H2O) and liquid paraffin (LP). In this study, we prepared nitric acid-treated BDS (NA-BDS) as an additive to H2O and NA-BDS modified with oleylamine (NA-BDS-OLA) as an additive to LP. Raman spectroscopy, field-emission transmission electron microscopy, Fourier transform infrared spectroscopy, and zeta potentiometry were used to characterize the results of the nitric acid treatment and oleylamine modification. The tribological behaviors and corresponding mechanisms of the new onion-like carbon nanoparticles were evaluated using a ball-on-disc reciprocating tribometer, as well as field-emission scanning electron microscopy, three-dimensional laser scanning microscopy, and Raman spectroscopy. The results indicated that the additives NA-BDS and NA-BDS-OLA, which were onion-like carbon nanoparticles with sizes ranging from 35 to 40 nm, enhanced the antiwear and friction reduction properties of H2O and LP, respectively. Through tribo-mechanisms, these types of soot can serve as spacers and ball bearings between the rubbing surfaces. Moreover, exfoliation under a high load as a result of the formation of a graphitic layer facilitates easy shearing.

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“…6(a 2 ), 6(b 2 ) and 6(c 2 )). It was obvious that LF-rGO and MF-rGO displayed severe aggregation with small size and became a chunk with almost none wrinkle while HF-rGO could be found with less aggregation with many dark areas and winkle [36]. These results illustrated that LF-rGO and MF-rGO were severely damaged during the friction process compared with HF-rGO.…”

Section: Friction Reduction and Wear Resistance Mechanism Analysismentioning

confidence: 90%

How the fluorographene replaced graphene as nanoadditive for improving tribological performances of GTL-8 based lubricant oil

Zhao

Luo

et al. 2020

Friction

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Fluorographene, a new alternative to graphene, it not only inherits the 2-dimensional (2D) layered structure and outstanding mechanical properties, but also possesses controllable C–F bonds. It is meaningful to reveal the evolution processes of the tribological behaviors from graphene to fluorographene. In this work, fluorinated reduced graphene oxide nanosheets (F–rGO) with different degree of fluorination were prepared using direct gas-fluorination and they were added into gas to liquid-8 (GTL-8) base oil as lubricant additive to improve the tribological performance. According to the results, the coefficient of friction (COF) reduced by 21%, notably, the wear rate reduced by 87% with the addition of highly fluorinated reduced graphene oxide (HF–rGO) compared with rGO. It was confirmed that more covalent C–F bonds which improved the chemical stability of HF–rGO resisted the detachment of fluorine so the HF–rGO nanosheets showed less damage, as demonstrated via X-ray photoelectron spectroscopy (XPS), Raman spectra, and transmission electron microscopy (TEM). Meanwhile, the ionic liquid (IL) adsorbed on HF–rGO successfully improved the dispersibility of F–rGO in GTL-8 base oil. The investigation of tribofilm by TEM and focused ion beam (FIB) illustrated that IL displayed a synergy to participate in the tribochemical reaction and increased the thickness of tribofilm during the friction process.

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Probing the Function of Solid Nanoparticle Structure under Boundary Lubrication

Cited by 59 publications

References 49 publications

3D graphene/hexagonal boron nitride composite nanomaterials synergistically reduce the friction and wear of Steel‐DLC contacts

3D graphene/hexagonal boron nitride composite nanomaterials synergistically reduce the friction and wear of Steel‐DLC contacts

Novel Carbon Nanoparticles Derived from Biodiesel Soot as Lubricant Additives

How the fluorographene replaced graphene as nanoadditive for improving tribological performances of GTL-8 based lubricant oil

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