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Yi C, Hu C, Shi L, Bai M, Li Y, Tang D. Frictional properties of MoS 2 on a multi-level rough wall under starved lubrication. Phys Chem Chem Phys 2023; 25:14348-14358. [PMID: 37183651 DOI: 10.1039/d3cp01288c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Owing to nano-MoS2's excellent anti-friction and anti-wear properties, nano-MoS2, which can act as a nano-additive in lubricating oil or solid lubricants, is believed to have great potential in the lubrication of power machinery and moving parts of a spacecraft. The molecular dynamics method was used to construct a rough surface and a multi-level asperity structure to simulate starved lubrication before oil film breakdown, and the lubrication mechanism of MoS2 as a nano-additive or directly coated on the textured surface could reduce the friction coefficient and wear was explained from the atomic perspective. Simulations showed that the multilayer MoS2 played a role of load-bearing at light load or low velocity, and slipped into the grooves to repair the surface under heavy load or high velocity. Even if local asperity contact occurs, MoS2 nanoparticles could accelerate the detachment of the initial asperity contact to prevent large-scale adhesion. The MoS2 nanoparticles transformed the pure liquid oil film into a liquid-solid composite oil film, which was more suitable for lubrication under heavy load and high velocity because it increased the contact area, protected the friction surface and prevented asperity contact. The proposed lubrication mechanism contributes to understanding the frictional properties of layered nanomaterials under extreme conditions and provides a reference for further application of MoS2 materials in the field of lubrication.
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Affiliation(s)
- Changli Yi
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Linggong Road NO. 2, Dalian, Liaoning, China.
| | - Chengzhi Hu
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Linggong Road NO. 2, Dalian, Liaoning, China.
| | - Lin Shi
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Linggong Road NO. 2, Dalian, Liaoning, China.
| | - Minli Bai
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Linggong Road NO. 2, Dalian, Liaoning, China.
| | - Yubai Li
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Linggong Road NO. 2, Dalian, Liaoning, China.
| | - Dawei Tang
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Linggong Road NO. 2, Dalian, Liaoning, China.
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Hu C, Yi C, Bai M, Lv J, Tang D. Molecular dynamics study of the frictional properties of multilayer MoS 2. RSC Adv 2020; 10:17418-17426. [PMID: 35515626 PMCID: PMC9053399 DOI: 10.1039/d0ra00995d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 04/19/2020] [Indexed: 11/21/2022] Open
Abstract
To reveal the friction mechanism of molybdenum disulfide (MoS2), the frictional properties of multilayer MoS2 lubrication film were studied under variable loads and shearing velocities by the molecular dynamics (MD) method. The results showed irreversible deformation of MoS2 was caused by heavy load or high shear velocity during the friction process and the interlayer velocity changed from a linear to a ladder-like distribution; thus, the number of shear surfaces and the friction coefficient decreased. The low friction coefficient caused by heavy load or high velocity could be maintained with a decrease in load or velocity. For a solid MoS2 lubrication film, the number of shearing surfaces should be reduced as much as possible and the friction pair should be run under heavy load or high shear velocity for a period of time in advance; thus, it could exhibit excellent frictional properties under other conditions. The proposed friction mechanism provided theoretical guidance for experiments to further improve the frictional properties of MoS2. Deformation of MoS2 layers directly leads to decrease in potential and ultimately leads to decrease in friction coefficient.![]()
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Affiliation(s)
- Chengzhi Hu
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology Dalian 116024 China
| | - Changli Yi
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology Dalian 116024 China
| | - Minli Bai
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology Dalian 116024 China
| | - Jizu Lv
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology Dalian 116024 China
| | - Dawei Tang
- Laboratory of Ocean Energy Utilization of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology Dalian 116024 China
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Guo J, Peng R, Du H, Shen Y, Li Y, Li J, Dong G. The Application of Nano-MoS 2 Quantum Dots as Liquid Lubricant Additive for Tribological Behavior Improvement. NANOMATERIALS 2020; 10:nano10020200. [PMID: 31979331 PMCID: PMC7074879 DOI: 10.3390/nano10020200] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/10/2020] [Accepted: 01/21/2020] [Indexed: 01/21/2023]
Abstract
Molybdenum disulfide quantum dots (MoS2 QDs) are a promising lubricant additive for enhanced engine efficiency. In this study, MoS2 QDs were used as lubricating oil additives for ball-on-disc contact and had adequate dispersity in paroline oil, due to their super small particle size (~3 nm). Tribological results indicate that the friction coefficient of paroline oil with 0.3 wt.% MoS2 QDs reached 0.061, much lower than that of pure paroline oil (0.169), which is due to the formation of a stable tribo-film formed by the MoS2, MoO3, FeS, and FeSO4 composite within the wear track. Synergistic lubrication effects of the tribo-film and ball-bearing effect cooperatively resulted in the lowest friction and wear.
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Affiliation(s)
- Junde Guo
- School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China; (R.P.); (Y.S.)
- Correspondence: (J.G.); (J.L.); (G.D.)
| | - Runling Peng
- School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China; (R.P.); (Y.S.)
| | - Hang Du
- School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China; (R.P.); (Y.S.)
| | - Yunbo Shen
- School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China; (R.P.); (Y.S.)
| | - Yue Li
- Institute of Machinery Manufacturing Technology, China Association of Employment Promotion, Mianyang 621900, China
| | - Jianhui Li
- School of Science, Xi’an Jiaotong University, Xi’an 710049, China
- Correspondence: (J.G.); (J.L.); (G.D.)
| | - Guangneng Dong
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China
- Correspondence: (J.G.); (J.L.); (G.D.)
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Hou K, Han M, Liu X, Wang J, He Y, Yang S. In situ formation of spherical MoS 2 nanoparticles for ultra-low friction. NANOSCALE 2018; 10:19979-19986. [PMID: 30350834 DOI: 10.1039/c8nr06503a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The motion resistance and energy dissipation of rolling friction are much lower than those of sliding friction at the macroscale. But at the microscale, the impact of rolling on friction remains an open question. Here, we show that spherical MoS2 nanoparticles can be formed in situ at a friction interface by scrolling and wrapping MoS2 nanosheets under the induction of a reciprocating shear stress, when an MoS2 coating constructed from loosely stacked nanosheets is tested in a vacuum of 3.5 × 10-3 Pa. An ultra-low friction state can be readily realized with friction coefficients of 0.004-0.006, which are one order of magnitude lower than that of a pulse laser deposited MoS2 coating without nanoparticles formed in a friction process. Accordingly, the spherical nanoparticles are highlighted as the key factor in the ultra-low friction. Classical molecular dynamics simulations further reveal that the motion mode of the MoS2 nanoparticle is stress-dependent. This finding confirms access to ultra-low friction by introducing rolling friction based on the microstructural evolution of the coating.
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Affiliation(s)
- Kaiming Hou
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
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Esquivel-Gaon M, Nguyen NHA, Sgroi MF, Pullini D, Gili F, Mangherini D, Pruna AI, Rosicka P, Sevcu A, Castagnola V. In vitro and environmental toxicity of reduced graphene oxide as an additive in automotive lubricants. NANOSCALE 2018; 10:6539-6548. [PMID: 29577120 DOI: 10.1039/c7nr08597d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Despite the ground-breaking potential of nanomaterials, their safe and sustainable incorporation into an array of industrial markets prompts a deep and clear understanding of their potential toxicity for both humans and the environment. Among the many materials with great potential, graphene has shown promise in a variety of applications; however, the impact of graphene based products on living systems remains poorly understood. In this paper, we illustrate that via exploiting the tribological properties of graphene nanosheets, we can successfully improve both the frictional behaviour and the anti-wear capacity of lubricant oil for mechanical transmission. By virtue of reducing friction and enhancing lubricant lifetimes, we can forecast a reduction in friction based energy loss, in addition to a decrease in the carbon footprint of vehicles. The aforementioned positive environmental impact is further strengthened considering the lack of acute toxicity found in our extensive in vitro investigation, in which both eukaryotic and prokaryotic cells were tested. Collectively, our body of work suggests that by the use of safe nanoadditives we could contribute to reducing the environmental impact of transportation and therein take a positive step towards a more sustainable automotive sector. The workflow proposed here for the evaluation of human and environmental toxicity will allow for the study of nanosized bare graphene material and can be broadly applied to the translation of graphene-based nanomaterials into the market.
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Affiliation(s)
- Margarita Esquivel-Gaon
- Centre for BioNano Interactions, School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Dublin, Ireland.
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Testing of WS2 Nanoparticles Functionalized by a Humin-Like Shell as Lubricant Additives. LUBRICANTS 2018. [DOI: 10.3390/lubricants6010003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Spetter D, Hoshyargar F, Sahoo JK, Tahir MN, Branscheid R, Barton B, Panthöfer M, Kolb U, Tremel W. Surface Defects as a Tool to Solubilize and Functionalize WS
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Nanotubes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601361] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dmitri Spetter
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Faegheh Hoshyargar
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Jugal Kishore Sahoo
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Muhammad Nawaz Tahir
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Robert Branscheid
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Bastian Barton
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Martin Panthöfer
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Ute Kolb
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
| | - Wolfgang Tremel
- Institute of Inorganic Chemistry and Analytical Chemistry Johannes Gutenberg University Duesbergweg 10‐14 55128 Mainz Germany
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Bäuerlein PS, Emke E, Tromp P, Hofman JAMH, Carboni A, Schooneman F, de Voogt P, van Wezel AP. Is there evidence for man-made nanoparticles in the Dutch environment? THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 576:273-283. [PMID: 27788442 DOI: 10.1016/j.scitotenv.2016.09.206] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 09/23/2016] [Accepted: 09/25/2016] [Indexed: 05/29/2023]
Abstract
Only very limited information is available on measured environmental concentrations of nanoparticles. In this study, several environmental compartments in The Netherlands were probed for the presence of nanoparticles. Different types of water were screened for the presence of inorganic (Ag, Au, TiO2) and organic nanoparticles (C60, C70, [6,6]-phenyl-C61-butyric acid octyl ester, [6,6]-phenyl-C61-butyric acid butyl ester, [6,6]-phenyl-C61-butyric acid methyl ester, [6,6]-bis-phenyl-C61-butyric acid methyl ester, [6,6]-phenyl-C71-butyric acid methyl ester, [6,6]-thienyl-C61-butyric acid methyl ester). Air samples were analysed for the presence of nanoparticulate Mo, Ag, Ce, W, Pd, Pt, Rh, Zn, Ti, Si, B as well as Fe and Cu. ICP-MS, Orbitrap-HRMS, SEM and EDX were used for this survey. Water samples included dune and bank filtrates, surface waters and ground waters as well as influents, effluents and sludge of sewage treatment plants (STPs), and surface waters collected near airports and harbours. Air samples included both urban and rural samples. C60 was detected in air, sewage treatment plants, influents, effluents and sludge, but in no other aqueous samples despite the low detection limit of 0.1ng/L. C70 and functionalised fullerenes were not detected at all. In STP sludge and influent the occurrence of Ag and Au nanoparticles was verified by SEM/EDX and ICP-MS. In air up to about 25m% of certain metals was found in the nanosize fraction. Overall, between 1 and 6% of the total mass from metals in the air samples was found in the size fraction <100nm.
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Affiliation(s)
- Patrick S Bäuerlein
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands.
| | - Erik Emke
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands
| | - Peter Tromp
- TNO, Netherlands Organization for Applied Scientific Research, Princetonlaan 6, P.O. Box 80015, 3508 TA Utrecht, The Netherlands
| | - Jan A M H Hofman
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands; Water Innovation and Research Centre, University of Bath, UK
| | - Andrea Carboni
- IBED Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, The Netherlands
| | | | - Pim de Voogt
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands; IBED Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, The Netherlands
| | - Annemarie P van Wezel
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands; Copernicus Institute, Utrecht University, The Netherlands
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Scharf TW, Goeke RS, Kotula PG, Prasad SV. Synthesis of Au-MoS(2) nanocomposites: thermal and friction-induced changes to the structure. ACS APPLIED MATERIALS & INTERFACES 2013; 5:11762-11767. [PMID: 24191763 DOI: 10.1021/am4034476] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The synthesis of Au-MoS2 nanocomposite thin films and the evolution of their structures during film growth, in situ transmission electron microscopy (TEM) heating, and sliding contact were investigated. TEM revealed that the films deposited at ambient (room) temperature (RT) consisted of 2-4 nm size Au particles in a matrix of MoS2. With increasing growth temperatures, the nanocomposite film exhibited structural changes: the Au nanoparticles coarsened by diffusion-driven Ostwald ripening to 5-10 nm size and the MoS2 basal planes encapsulated the Au nanoparticles thereby forming a solid Au-core MoS2 structure. However, when the RT deposited film was heated inside the TEM, the highly ordered MoS2 basal planes did not encapsulate the Au, suggesting that MoS2 surface diffusivity during film growth is different than MoS2 bulk diffusion. Increases in MoS2 crystallinity and coarsening of Au nanoparticles (up to 10 nm at 600 °C) were observed during in situ TEM heating of the RT deposited film. Sliding contact during friction and wear tests resulted in a pressure-induced reorientation of MoS2 basal planes parallel to the sliding direction. The subsurface coarsened Au nanoparticles also provide an underlying load support allowing shear of surface MoS2 basal planes.
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Affiliation(s)
- T W Scharf
- Materials Science and Engineering Center, Sandia National Laboratories , Albuquerque, New Mexico 87185-0889, United States
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