Preparation and tribological properties of MoS2/graphene oxide composites

Song, Haojie; Wang, Biao; Zhou, Qiang; Xiao, Jiaxuan; Jia, Xiaohua

doi:10.1016/j.apsusc.2017.05.022

Cited by 99 publications

(40 citation statements)

References 27 publications

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“…Numerous studies have been conducted to investigate the tribological features and thermophysical behaviors of MoS 2 nano-additive oil-based lubricants. The results proved that the lubricity characteristics of the prepared nanofluids is strikingly improved with the corporation of MoS 2 nanoparticles 10,[23][24][25][26][27][28][29][30][31][32][33][34][35] . Cabaleiro et al 36 studied the thermophysical and rheological characteristics of the ZnO nanofluids.…”

mentioning

confidence: 99%

Experimental comparison between ZnO and MoS2 nanoparticles as additives on performance of diesel oil-based nano lubricant

Mousavi

Heris

Estellé

2020

Sci Rep

176

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this study compares the tribological and thermophysical features of the lubricating oil using MoS 2 and Zno nano-additives. the average size of MoS 2 and ZnO nanoparticles were 90 nm and 30 nm, respectively. The nanoparticles were suspended using Triton X-100 in three different concentrations (0.1, 0.4 and 0.7 wt.%) in a commercial diesel oil. Tribological properties such as mass loss of the pins, friction coefficient, and worn surface morphologies and thermophysical properties such as viscosity, viscosity index, flash point and pour point of resulting nano lubricant were evaluated and compared with those of pure diesel oil. the tribological behavior of nano lubricants was evaluated using a pin-ondisc tribometer. the worn surface morphologies were observed by scanning electron microscopy. the overall results of this experiment reveal that the addition of nano-MoS 2 reduces the mass loss values of the pins in 93% due to the nano-MoS 2 lubricant effect. With 0.7 wt.% in nanoparticles content, the viscosity of MoS 2 and ZnO nano lubricants at 100 °C increased by about 9.58% and 10.14%, respectively. Pure oil containing 0.7 wt.% of each nanoparticle increased the flash point because of its small size and surface modifying behavior compared to the pure oil. Moreover, the addition of Zno nanoparticles with pure oil lubricant is more suitable than MoS 2 nanoparticles for improving the thermophysical properties of pure oil.

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mentioning

confidence: 99%

Experimental comparison between ZnO and MoS2 nanoparticles as additives on performance of diesel oil-based nano lubricant

Mousavi

Heris

Estellé

2020

Sci Rep

176

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“…Xu et al [35] observed synergic tribological behavior of MoS 2 and graphene dispersed in esterified bio-oil. The tribological activity of hydrothermally synthesized composite, MoS 2 -graphene oxide, has been reported by Song and coworkers [36].…”

Section: Introductionmentioning

confidence: 70%

“…The presence of weak van der Waals forces between molecular S-Mo-S tri-layers facilitates interlayer slippage. MoS 2 and graphene nanosheets or their nanocomposites have been used very often as oil additives for enhanced lubrication [34][35][36]. Xu et al [35] observed synergic tribological behavior of MoS 2 and graphene dispersed in esterified bio-oil.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Tribo-Activity of Nanohybrids of Zirconia/Cerium-Doped Zirconia Nanoparticles with Nano Lamellar Reduced Graphene Oxide and Molybdenum Disulfide

et al. 2020

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Zirconia and 10%, 20%, and 30% cerium-doped zirconia nanoparticles (ZCO), ZCO-1, ZCO-2, and ZCO-3, respectively, were prepared using auto-combustion method. Binary nanohybrids, ZrO2@rGO and ZCO-2@rGO (rGO = reduced graphene oxide), and ternary nanohybrids, ZrO2@rGO@MoS2 and ZCO-2@rGO@MoS2, have been prepared with an anticipation of a fruitful synergic effect of rGO, MoS2, and cerium-doped zirconia on the tribo-activity. Tribo-activity of these additives in paraffin oil (PO) has been assessed by a four-ball lubricant tester at the optimized concentration, 0.125% w/v. The tribo-performance follows the order: ZCO-2@rGO@MoS2 > ZrO2@rGO@MoS2 > ZCO-2@rGO > ZrO2@rGO > MoS2 > ZrO2 > rGO > PO. The nanoparticles acting as spacers control restacking of the nanosheets provided structural augmentation while nanosheets, in turn, prevent agglomeration of the nanoparticles. Doped nanoparticles upgraded the activity by forming defects. Thus, the results acknowledge the synergic effect of cerium-doped zirconia and lamellar nanosheets of rGO and MoS2. There is noncovalent interaction among all the individuals. Analysis of the morphological features of wear-track carried out by scanning electron microscopy (SEM) and atomic force microscopy (AFM) in PO and its formulations with various additives is consistent with the above sequence. The energy dispersive X-ray (EDX) spectrum of ZCO-2@rGO@MoS2 indicates the existence of zirconium, cerium, molybdenum, and sulfur on the wear-track, confirming, thereby, the active role played by these elements during tribofilm formation. The X-ray photoelectron spectroscopy (XPS) studies of worn surface reveal that the tribofilm is made up of rGO, zirconia, ceria, and MoS2 along with Fe2O3, MoO3, and SO42− as the outcome of the tribo-chemical reaction.

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“…Usually, electrostatic stabilization and steric stabilization are achieved by tuning the van der Waals attractive forces and electrical double layer repulsive forces, stabilizing the nanomaterials in oils [17,18]. Therefore, lipophilic surfactants are normally used to disperse nanomaterials in oils [19,20].…”

Section: Introductionmentioning

confidence: 99%

Dispersion-tribological property relationship in mineral oils containing 2D layered α-zirconium phosphate nanoplatelets

et al. 2019

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Inorganic nanomaterials exhibit superior friction-reduction and anti-wear properties in oils. In this study, 2D layered -zirconium phosphate (-ZrP) nanosheets intercalated with different amines have been synthesized to study their dispersion stabilities in lubricating oil and tribological applications. The intercalated amines should be sufficiently long and lipophilic to provide stabilization to -ZrP nanosheets in mineral oil. The results of tribological tests illustrate that with the addition of well-dispersed nanosheets, the coefficient of friction (COF) and pin volume loss reduce by ~47% and 75%, respectively. The excellent dispersion stability enables the nanosheets to flow into the contact area at the beginning, and thereby protect the rubbing surface. A reduction in the van der Waals forces between the adjacent layers induced by the intercalated amines transforms the friction between adjacent layers from pin disk to sliding, leading to a decrease in the COF under hydrodynamic lubrication. The study provides a new method to enhance the tribological properties via tuning the dispersion stabilities of nanomaterials in oils.

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Preparation and tribological properties of MoS2/graphene oxide composites

Cited by 99 publications

References 27 publications

Experimental comparison between ZnO and MoS2 nanoparticles as additives on performance of diesel oil-based nano lubricant

Experimental comparison between ZnO and MoS2 nanoparticles as additives on performance of diesel oil-based nano lubricant

Synergistic Tribo-Activity of Nanohybrids of Zirconia/Cerium-Doped Zirconia Nanoparticles with Nano Lamellar Reduced Graphene Oxide and Molybdenum Disulfide

Dispersion-tribological property relationship in mineral oils containing 2D layered α-zirconium phosphate nanoplatelets

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