MoS2 functionalized lithium complex soap with enhanced thickening net structure toward high-performance thickener

Fan, Xiaoqiang; Wei, Xiaofeng; He, Yushan; Zhao, Zhuang; Lin, Kaiyue; Zhu, Minhao

doi:10.1016/j.cej.2023.147445

Cited by 6 publications

(3 citation statements)

References 57 publications

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“…Tribological performance of polymer composites is not an intrinsic property. Although the complicated tribological processes have been far from being understood, abundant previous works demonstrated that tribofilm growth determines to a large extent the tribological performance of composites subjected to sliding under dry and boundary lubrication conditions. − Some of essential factors governing the tribofilm growth at dry polymer/metal sliding interface have been disclosed, which can provide instructions for formulating tribo-composites. − It has been commonly recognized that two-dimensional layered materials , (e.g., graphite and molybdenum disulfide (MoS 2 ) − ) in polymer matrices transfer easily onto the metallic counterface . Harris et al revealed that when poly(ether–ether–ketone)/nanoalumina slides against a steel, breakage of polytetrafluoroethylene molecules occurs and carboxylate chain ends produced after a series of chemical actions finally chelate to both the steel and the nanoalumina surfaces.…”

Section: Introductionmentioning

confidence: 99%

Synergism of TiO₂ and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

Zhang,

Xu,

et al. 2024

ACS Sustainable Chem. Eng.

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Phenolic resin (PF) coatings were formulated and deposited onto Al alloy surfaces, and their tribo-performance was evaluated. It is demonstrated that even when being lubricated with poly(alpha olefin) 4 (PAO 4) base oil, the PF-based coatings reinforced with titanium dioxide (TiO2) or/and nickel (Ni) exhibit excellent tribo-performance under harsh boundary lubrication conditions. Interestingly, synergetic antiwear roles of TiO2 and Ni were identified. In comparison to the conventional PF coating filled with molybdenum disulfide (MoS2), friction and wear of the hybrid coating containing TiO2 and Ni are reduced by up to 80.7% and 83.2%, respectively. Furthermore, the hybrid coating lubricated with PAO 4 base oil exhibit a much lower friction and wear than the uncoated Al alloy lubricated with zinc dialkyldithiophosphat (ZDDP)-additivated oil. Our work provides direct evidence that the addition of TiO2 or Ni leads to the growth of tribofilms of distinctly different nanostructures. It is interesting that the addition of a TiO2/Ni combination gives rise to the formation of a double-layered tribofilm, i.e., a TiO2/NiO bottom layer and a carbon-based top layer. This work offers an avenue for minimizing dependency on hazardous lubrication additives.

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Section: Introductionmentioning

confidence: 99%

Synergism of TiO₂ and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

Zhang,

Xu,

et al. 2024

ACS Sustainable Chem. Eng.

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“…20 The MoS 2 -functionalized lithium complex-based soap as a high-performance thickener reduced the friction coefficient (29%) and wear by forming a MoS 2based tribochemical thin film. 21 MoS 2 exists in 3 different polymorphs, i.e., 1T, 2H, and 3R. Herein, 1, 2, and 3 numerals denote the number of lamellae in the unit shell, whereas H, T, and R symbolize hexagonal, trigonal, and rhombohedral lattice structures, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The MoS 2 coating showed ultralow friction under the dry nitrogen atmosphere and vacuum . The MoS 2 -functionalized lithium complex-based soap as a high-performance thickener reduced the friction coefficient (29%) and wear by forming a MoS 2 -based tribochemical thin film . MoS 2 exists in 3 different polymorphs, i.e., 1T, 2H, and 3R.…”

Section: Introductionmentioning

confidence: 99%

1T/2H-MoS₂ Heterostructure for Lubrication Enhancement and Tribo-Induced Phase Transformation into 2H-MoS₂

Pandey,

Kumari,

Goswami

et al. 2024

ACS Appl. Eng. Mater.

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Heterostructures comprising two-dimensional (2D) nanomaterials of dissimilar lattice constants govern the interfacial interactions, induce structural strain, and influence the mechanical properties, resulting in a low shear strength to minimize friction. The present work addresses a facile hydrothermal approach to synthesize an ammonium surfactant-stabilized 1T/2H-MoS 2 heterostructure comprising van der Waals interaction-driven interfacially stacked 1T metallic and 2H semiconducting phases of MoS 2 . The high mole ratios of the ammonium surfactant facilitated the formation of 1T-MoS 2 beside the 2H phase, yielding the 1T/2H-MoS 2 heterostructure. Raman, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) analyses explicitly confirmed both the 1T and 2H phases in the 1T/2H-MoS 2 heterostructures. The long alkyl chain of the ammonium surfactant grafted on the surface of the 1T/2H-MoS 2 heterostructure extended its dispersibility in fully formulated 10W40 engine lube oil. A minute quantity of 1T/2H-MoS 2 in engine lube oil (optimum dose: 0.3 mg•mL −1 ) improved the lubrication performance of the steel tribopair by minimizing friction (24%) and wear volume (76%). Raman analyses of the worn area after the lubrication test with the 1T/2H-MoS 2 heterostructure revealed the tribo-induced transformation of 1T into the 2H phase and formed a 2H-MoS 2 -based tribo thin film on contact surfaces of steel balls for enhancement of lubrication properties. The significantly low weak van der Waals interaction between interfacially stacked lamellae of 1T and 2H phases in the 1T/2H-MoS 2 heterostructure furnished a lower coefficient of friction than that of 2H-MoS 2 under identical tribological conditions. These findings promise the use of 2D heterostructures for tribological applications to enhance lubrication properties.

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Application of thermodynamics to industrial grease production

Lijesh,

Miller,

Sanford

et al. 2024

Chemical Engineering Journal

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MoS2 functionalized lithium complex soap with enhanced thickening net structure toward high-performance thickener

Cited by 6 publications

References 57 publications

Synergism of TiO₂ and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

Synergism of TiO₂ and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

1T/2H-MoS₂ Heterostructure for Lubrication Enhancement and Tribo-Induced Phase Transformation into 2H-MoS₂

Application of thermodynamics to industrial grease production

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MoS2 functionalized lithium complex soap with enhanced thickening net structure toward high-performance thickener

Cited by 6 publications

References 57 publications

Synergism of TiO2 and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

Synergism of TiO2 and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

1T/2H-MoS2 Heterostructure for Lubrication Enhancement and Tribo-Induced Phase Transformation into 2H-MoS2

Application of thermodynamics to industrial grease production

Contact Info

Product

Resources

About

Synergism of TiO₂ and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

Synergism of TiO₂ and Ni on the Growth of a Double-Layered Tribofilm: New Strategy for ZDDP Replacement

1T/2H-MoS₂ Heterostructure for Lubrication Enhancement and Tribo-Induced Phase Transformation into 2H-MoS₂