Tribological Properties of Oleylamine-Modified Ultrathin WS2 Nanosheets as the Additive in Polyalpha Olefin Over a Wide Temperature Range

Jiang, Zhengquan; Zhang, Yujuan; Yang, Guangbin; Yang, Kunpeng; Zhang, Shengmao; Yu, Laigui; Zhang, Pingyu

doi:10.1007/s11249-016-0643-5

Cited by 53 publications

(42 citation statements)

References 26 publications

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“…The dispersion stability of surfactant-modified nanoparticles was also closely linked to their size. Nanoparticles under 10 nm in size show better stability of dispersion by using the surfactant surface modification method [10,24,53,55,57,74]. This result can be explained by the steric stabilization theory discussed in the next chapter.…”

Section: Surfactantmentioning

confidence: 75%

“…Instead of modifying nanoparticles, this method uses a surfactant to modify the precursor of nanoparticles first, which allows synthesizing of nanoparticles with a pre-attached surfactant. The tungsten sulfide nanoparticles synthesized using this method achieved remarkable dispersion stability in both room temperature and low temperature conditions [24]. This method can also synthesize other types of metal sulfide.…”

Section: Surfactantmentioning

confidence: 89%

“…Due to the abundance of the hydroxyl group on their surface, oxide is well suited to be modified by both surfactant and silane [115,125,130]. In existing reports, there was only one non-oxide nanoparticle additive suspended for more than 1 month [24]. This was made possible by adding surfactant to modify the precursors of WS 2 nanoparticles with oleyamin.…”

Section: Discussionmentioning

confidence: 99%

“…As nanolubricants require a long time to become stable, methods have been reported to examine dispersion in time. The widely used method is visual inspection [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. The lubricant dispersed with nanoparticles is visually different compared to a lubricant.…”

Section: Dispersion Methodsmentioning

confidence: 99%

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Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

2019

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Nanolubricants have attracted great interest due to the promise of friction and wear reduction by introducing nanoparticles. To date, the foremost challenge for developing a new nanolubricant is particle suspension. To understand the mechanisms of nanoparticle dispersion and identify bottlenecks, we conducted a comprehensive review of published literature and carried out an analysis of dispersion based on available data from the past 20 years. This research has led to three findings. First, there are two primary methods in dispersion: formulation with dispersant and surface modification. Second, surfactant and alkoxysilanes are primary chemical groups used for surface modification. Third, functionalization using surfactant is found to be suitable for nanoparticles smaller than 50 nm. For larger particles (>50 nm), alkoxysilanes are the best. The existence of a critical size has not been previously known. To better understand these three findings, we conducted an analysis using a numerical calculation based on colloidal theory. It revealed that a minimal thickness of the grafted layer in surfactant-modified nanoparticles was responsible for suspending small nanoparticles. For larger nanoparticles (>50 nm), they were suitable for silanization of alkoxysilane due to increased grafting density. This research provides new understanding and guidelines to disperse nanoparticle in a lubricating oil.

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Section: Surfactantmentioning

confidence: 75%

Section: Surfactantmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Dispersion Methodsmentioning

confidence: 99%

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Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

2019

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“…Early in 1994, we found that MoS 2 nanoparticles as a lubricant additive can effectively reduce the friction and wear of steel‐steel sliding pair . Since then, various inorganic nanoparticles, including oxide nanoparticles, metal nanoparticles, and other nanostructures have been tested to improve the tribological properties of lubricating oils . Copper is widely used as a solid lubricating material and polymer‐based self‐lubricating filler because of its good ductility, low hardness and shear strength.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cu@SiO₂composite nanoparticle and its tribological properties as water‐based lubricant additive

Liu

Zhou

Gao

et al. 2020

Lubrication Science

Self Cite

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In this paper, to solve the problem that di-n-hexadecyldithiophosphate (DDP)modified Cu nanoparticles initially used as oil-based lubricant additive cannot be directly used in water-based lubricants, we adopt a water-in-oil reverse micro-emulsion method to incorporate hydrophobic Cu nanoparticles into silica spheres for obtaining water-dispersible Cu@SiO 2 nanoparticles. The effects of reaction conditions on the morphology and microstructure of Cu@SiO 2 nanoparticles were investigated. Furthermore, the tribological properties of the as-prepared Cu@SiO 2 nanoparticles as a lubricant additive in distilled water were investigated with a UMT-2MT tribometer. Results indicate that the as-prepared Cu@SiO 2 nanoparticles exhibit good dispersion stability and antioxidant ability in distilled water. Besides, Cu@SiO 2 nanoparticles can significantly improve the tribological properties of distilled water, which is attributed to the formation of a protective and lubricious film consisting of Cu, FeS and SiO 2 on the rubbed steel surface. K E Y W O R D Scu@SiO 2 nanoparticles, reverse micro-emulsion system, tribological properties, water-based lubricant additive

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Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

Marian

Berman

Rota

et al. 2021

Adv Materials Inter

122

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prominent members being molybdenum disulfide (MoS 2 ) and tungsten disulfide (WS 2 ). [2] In addition to graphene-and TMD-based nanomaterials, new 2D nanomaterials [3] such as silicenes, [4] hexagonal boron nitride (h-BN), [5] black phosphorous (BP), [6,7] halide structures, [8] metal-organic framework nanosheets, [9] and MXenes [10,11] are currently optimized regarding their synthesis methods and expectable yield. The coupling of excellent electrical and thermal conductivity with great mechanical properties, high surface-to-volume ratios, and the existence of surface terminations, which enable their chemical functionalization, has made these 2D nanomaterials promising candidates to be used in different applications such as energy storage devices and supercapacitors, [12] (photo)-catalysis, [13] water purification, [14] and tribological systems. [15][16][17][18] In the tribological context, 2D layered structures showed their great potential in improving friction and wear of various substrate materials under dry and lubricated conditions. With respect to the lubricated conditions, 2D materials are typically used as lubricant additives in base oils with the overall purpose to fulfill different functions in the contact area. During sliding, nanomaterials may act both as shearing films and nano-roller bearings, thus potentially changing the friction mode from sliding to rolling friction and regulating the resulting lubricant flow, thus reducing frictional losses. [19] Irrespective of the prevalence of dry or lubricated conditions, 2D materials may be capable of initiating tribo-chemical reactions in the contact area Recent advances in 2D nanomaterials, such as graphene, transition metal dichalcogenides, boron nitride, MXenes, allow not only to discover several new nanoscale phenomena but also to address the scientific and industrial challenges associated with the design of systems with desired physical properties. One of the great challenges for mechanical systems is associated with addressing friction and wear problems in machine elements. In this review, the beneficial properties of layered 2D materials that enable the control of their tribological behavior and make them excellent candidates for efficient friction and wear reduction in dry-running and boundary lubricated machine components are summarized. The recent studies highlighting the successful implementation of 2D structures when used as solid lubricant coatings or reinforcement phases in composites for various machine components including sliding and rolling bearings, gears, and seals are overviewed. The examples presented in the studies demonstrate the great potential for 2D materials to address the energy-saving needs by friction and wear reduction.

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Tribological Properties of Oleylamine-Modified Ultrathin WS2 Nanosheets as the Additive in Polyalpha Olefin Over a Wide Temperature Range

Cited by 53 publications

References 26 publications

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

Preparation of Cu@SiO₂composite nanoparticle and its tribological properties as water‐based lubricant additive

Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

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Tribological Properties of Oleylamine-Modified Ultrathin WS2 Nanosheets as the Additive in Polyalpha Olefin Over a Wide Temperature Range

Cited by 53 publications

References 26 publications

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

Preparation of Cu@SiO2composite nanoparticle and its tribological properties as water‐based lubricant additive

Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

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Preparation of Cu@SiO₂composite nanoparticle and its tribological properties as water‐based lubricant additive