Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Rosentsveig, Rita; Gorodnev, A. L.; Feuerstein, N.; Friedman, H.; Zak, Alla; Fleischer, N.; Tannous, Johny; Dassenoy, Fabrice; Tenne, R.

doi:10.1007/s11249-009-9472-0

Cited by 169 publications

(114 citation statements)

References 23 publications

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“…This observation could suggest that while exfoliation and third body transfer of molecular sheets onto the asperities is a prevalent mechanism for improved tribological behavior of IF nanoparticles, the size of the particles also plays an important role in improving the tribological properties. Tenne et al [17] recently synthesized fullerene-like MoS 2 nanoparticles using a new quartz-made reactor. The nanoparticles were found to exhibit high crystalline order with an average size of 70 nm and comprising more than 30 closed shells.…”

Section: Discussionmentioning

confidence: 99%

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

et al. 2009

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Inorganic fullerene-like (IF) MoS 2 and WS 2 nanoparticles were found to be good friction modifiers and anti-wear additives when dispersed in a lubricant. Their tribological performance seems to be related to the structure, size, and shape of these nanomaterials. The present study describes the tribological properties of a new inorganic fullerene IF-Mo x W 1-x S 2 containing both molybdenum and tungsten disulfide under boundary lubrication. Mo x W 1-x S 2 amorphous inorganic fullerene nanostructures were synthesized by means of MOCVD using an induction furnace setup. The average diameters range from 25 to 45 nm. Upon variation of the amounts of precursors and S, various solid solutions of IF-Mo x W 1-x S 2 were obtained. In addition, a morphological, chemical, and structural analysis of the samples was performed using high resolution scanning electron microscopy (HRSEM), transmission electron microscopy (TEM), and X-ray powder diffraction (XRD). Friction experiments were carried out with a ball-on-flat contact using an environmental tribometer. The results show interesting friction reducing and wear properties of these nanomaterials. The change in the molecule stoichiometry, which led to a variation of particles size but also to a variation of the crystallinity of the particles, affects the tribological performance.

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Section: Discussionmentioning

confidence: 99%

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

et al. 2009

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“…The friction reduction mechanism indicated that nanoparticles in the thin film elastohydrodynamic lubricant regime restrict only a few layers of lubricant molecules to slide (shearing) on each other. It should be noted that nanotubes also showed promising properties for the lubrication [47,48].…”

Section: Multiscale Modeling and Simulation Of Rolling Contact Fatiguementioning

confidence: 99%

Multiscale modeling and simulation of rolling contact fatigue

Gharehbagh

Ali

2018

International Journal of Fatigue

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iii ABSTRACT In this thesis, a hierarchical multiscale method was developed to predict rolling contact fatigue lives of mechanical systems. In the proposed multiscale method, the molecular modeling and simulation of lubricant was conducted to investigate the friction between rolling contact surfaces. The calculated friction coefficient was passed to the continuum model of rolling contact components to predict fatigue lives.Molecular dynamics modeling and simulation of thin film lubrication and lubricated contact surfaces were carried out to investigate mechanisms of hydrodynamic lubrication at nano-scale first. Although various lubricant alkane chains were considered in the molecular model, the chain length of eight united molecules were mainly employed in this thesis. In addition, the effects of temperature and nano-particles (debris) on the friction forces were discussed. It was found that the existing of nano-particles (debris) could increase the friction force between contact surfaces with hydrodynamic lubrication.In the continuum model of the developed multiscale method, finite element analysis was employed to predict rolling contact fatigue life of rolling contact components, including bearing and gear-tooth. Specifically, the fatigue crack initiation of bearing was studied, and then the fatigue crack initiation and propagation in gear-tooth. In addition, the enhancement of gear-tooth fatigue life by using composite patches was discussed as well. It should be noted that the friction coefficient used in the continuum model was calculated in the molecular model. It is one-way message passing in iv the developed multiscale method.Another continuum method was studied and developed in this thesis to provide alternate methods for the continuum model in the proposed multiscale framework.Peridynamics method has advantages in modeling and simulation of discontinuities, including cracks, over the conventional finite element methods. The applications of Peridynamics in predicting fatigue crack initiation and propagation lives were discussed in this thesis. v PUBLIC ABSTRACTThis research aims to develop a hierarchical multiscale method to predict rolling contact fatigue lives of mechanical systems. In the proposed multiscale method, the molecular modeling and simulation of lubricant was conducted to investigate the friction between rolling contact surfaces. The calculated friction coefficient was passed to the continuum model of rolling contact components to predict fatigue lives.Molecular dynamics modeling and simulation of thin film lubrication and lubricated contact surfaces were carried out to investigate mechanisms of hydrodynamic lubrication at nano-scale first. In addition, the effects of temperature and nano-particles (debris) on the friction forces were discussed. It was found that the existing of nanoparticles (debris) could increase the friction force between contact surfaces with hydrodynamic lubrication.In the continuum model of the developed multiscale method, finite element analysis was employed to pred...

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“…Nanosized MoS 2 (nano-MoS 2 ) usually has better properties than bulk MoS 2 and attracts considerable attention. At present, some chemical routes have been reported to synthesize nano-MoS 2 particles [6][7][8][9][10]. In a previous study, a quick precipitation method was designed to prepare MoS 2 nanoparticles in various shapes [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of nano-MoS2/AlOOH composite

Cai

Shao

et al. 2011

Reac Kinet Mech Cat

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A MoS 2 /AlOOH composite was synthesized by calcining the reaction product of Na 2 MoO 4 , Na 2 S, HCl and basic Al 2 O 3 . The obtained composite was characterized using thermal analysis, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, high-resolution transmission electron microscopy, ultraviolet-visible spectroscopy and infrared spectroscopy. The degradation reaction of methyl orange was used to evaluate the photocatalytic properties of the composite. The results showed that alumina existed in the form of AlOOH with the deposited nano-MoS 2 on the surface. The composite contained an intensive absorption between 380 and 450 nm and presented excellent photocatalytic properties. In addition, the composite still retained a high catalytic activity after repeatedly used for three times. The catalytic activity of the composite was influenced by the initial concentration of methyl orange, the amount of the catalyst, the pH value, and the temperature. The composite was a promising photocatalyst for the removal of organic chemicals from wastewater.

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Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Cited by 169 publications

References 23 publications

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

Multiscale modeling and simulation of rolling contact fatigue

Synthesis and photocatalytic properties of nano-MoS2/AlOOH composite

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