Effect of MoS2 and WS2 Nanotubes on Nanofriction and Wear Reduction in Dry and Liquid Environments

Maharaj, Dave; Bhushan, Bharat

doi:10.1007/s11249-012-0071-0

Cited by 48 publications

(56 citation statements)

References 39 publications

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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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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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“…Further reductions in friction and wear were obtained when nano-objects were submerged in water, dodecane, and glycerol [25][26][27]. Reductions in friction and wear as a result of the presence of nano-objects are believed to occur through rolling, sliding, and dragging of nanoobjects as depicted in Fig.…”

Section: Introductionmentioning

confidence: 98%

“…In manipulation studies with an AFM under dry conditions, several groups have demonstrated the contact area and relative humidity dependence of friction force [11,25,29,30,35]. Studies carried out in liquid environments have shown reductions in friction force [25][26][27]. For tribological applications on the micro-/nanoscale, increasing the lifetime and efficiency of individual components of systems is crucial to the commercialization of micro-/nanoelectromechanical systems (MEMS/NEMS) [3].…”

Section: Introductionmentioning

confidence: 99%

“…Studies have been carried out in dry conditions on the macroscale [5, 25-27, 32, 39], microscale using a surface force apparatus (SFA) [43,45], and the nanoscale using an AFM [11, 18, 22, 24-27, 29, 30, 35, 38, 40]. In liquid conditions studies have also been carried out on the macroscale [5,9,10,16,17,20,21,[25][26][27]33], microscale, using an SFA [1,15], and nanoscale using an AFM [25][26][27]34].…”

Section: Introductionmentioning

confidence: 99%

“…In nanotribological studies using an AFM, reductions in friction and wear were observed when Au, silica, and CNH nanoparticles and MoS 2 and WS 2 nanotubes were used as lubricants in dry conditions [25][26][27]30]. Further reductions in friction and wear were obtained when nano-objects were submerged in water, dodecane, and glycerol [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Nanomanipulation and Nanotribology of Nanoparticles and Nanotubes Using Atomic Force Microscopy

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Inorganic Nanotubes and Fullerene–Like Nanoparticles from Layered (2D) Compounds

Yadgarov

Popovitz‐Biro

Tenne

2017

Handbook of Solid State Chemistry

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Soon after carbon nanotubes were discovered by Iijima (Nature, 1991), we proposed (Nature, 1992) that inorganic layered compounds, likeWS2, are unstable in the planar form in the nanorange. Under proper chemical conditions, this inherent instability leads to folding of the layers and formation of hollow closed‐cage structures, that is, nanotubes (INT) and fullerene‐like (IF) nanoparticles. Given the elastic energy of the bending, formation of these closed‐cage nanostructures is pending on providing enough energy, that is, high temperature reactions. In the following years, we and others have preparedIF/INTfrom numerous layered compounds and studied their properties. Numerousab initiostudies were also dedicated to the study of nanotubes from different layered compounds. Recent developments in this field will be described, including the study of nanotubes from “misfit” compounds; doping of theIF/INT; ultrahigh temperature synthesis ofIF/INT; their optical and electrical properties, and so on. The mechanical properties of individual nanotubes were studied experimentally and usingab initiocalculations.Studying in detail the growth‐mechanism ofIF/INTof several compounds, mostlyWS2andMoS2we were able to scale‐up their synthesis to mass production. Several applications for theseIF/INT, especially as superior solid lubricants and for reinforcing polymer nanocomposites, were put forward. The successful commercialization of products based on these ideas will be briefly described.

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Effect of MoS2 and WS2 Nanotubes on Nanofriction and Wear Reduction in Dry and Liquid Environments

Cited by 48 publications

References 39 publications

Multiscale modeling and simulation of rolling contact fatigue

Multiscale modeling and simulation of rolling contact fatigue

Nanomanipulation and Nanotribology of Nanoparticles and Nanotubes Using Atomic Force Microscopy

Inorganic Nanotubes and Fullerene–Like Nanoparticles from Layered (2D) Compounds

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