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Hydrothermal-assisted grinding route for WS2 quantum dots (QDs) from nanosheets with preferable tribological performance
摘要： The 2D nanomaterials have achieved the superlubrication property whatever in solid or liquid lubrication in recent years. However, whether or not the nanosheets can stably disperse in oils and smoothly enter into the asperity of friction pairs is crucial for exerting the function of antifriction. The structure of 2D QDs is desirable for addressing these issues due to its smaller 3D size. In this study, we developed a facile preparation process for WS2 QDs with uniform 2nm size from nanosheets via hydrothermal-assisted grinding approach. The structure of the as-obtained WS2 QDs was determined by a series of characterizations. The results showed that the as-obtained WS2 QDs exhibited the typical spectrum features of nanosized quantum dot. The results of the tribological performance in grease verified that the average grease, respectively, exhibiting a preferable friction reducing and wear resistance. friction coefficient (ACOFs) and wear volume (AWVs) were decreased by 7.89% and 63.90% relative to In this work, we successfully developed a facile exfoliation process for WS2 QDs from nanosheets via hydrothermal-assisted grinding approach. The as-obtained WS2 QDs were determined by a series of characterizations. The preparation mechanism of WS2 QDs was proposed. The tribological properties of the as-exfoliated WS2 QDs in grease were intensively evaluated by the reciprocating ball-on-disk mode.
关键词： WS2,Nanosheets,Tribological performance,Quantum dots,Grease
更新于2025-09-23 15:19:57
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Laser-induced improvement in tribological performances of surface coatings with MoS2 nanosheets and graphene
摘要： To deal with the corrosive property of bio-oil, laser-induced coatings were synthesized on the typical cylinder liner rubbing surfaces. Two nano-additives including MoS2 nanosheets and graphene were introduced into the coatings. The tribological performances of the coated surfaces were tested on a multifunctional cylinder liner-piston ring tribometer. The surfaces before and after sliding were characterized with modern surface analysis technology including Raman spectra, X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and etc. The results show that the nickel-based coated surfaces can effectively prevent the corrosion of the bio-oil. In addition, the laser-induced coatings had better antifriction and antiwear performances than the corresponding traditional electroless plating coatings. With the introduction of MoS2 nanosheets or graphene, the tribological performances of the coatings were further enhanced. Laser irradiation increased the concentration of the nano-additives in the coatings and the thickness of the tribo-layers, which accounted for their outstanding tribological performances.
关键词： Laser-induced coating,Graphene,Bio-oil,MoS2 nanosheets,Tribological performance
更新于2025-09-10 09:29:36
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Novel polyimide nanocomposites enhanced by covalent modified graphene nanosheets based on Friedel–Crafts reaction
摘要： We report a new approach to fabricate novel polyimide (PI) nanocomposites using amine-functionalized graphene nanosheets (AGNS). AGNS was successfully prepared by Friedel–Crafts (F–C) reaction and nitroreduction. The PI nanocomposites with outstanding strength and high tribological performance were obtained though in situ polymerization in the presence of different contents of AGNS. The thermal stability, mechanical performance, and the tribological properties of PI/AGNS nanocomposites were significantly enhanced compared with that of pristine PI and PI/graphene nanosheets (GNS) blends, resulting from the strong covalent bonds between AGNS with PI matrix. Particularly, given that the friction coefficient and wear rate were reduced separately by 20.5% and 90.5% under dry sliding condition, the PI/AGNS nanocomposite with 0.5 wt% AGNS manifested the optative friction performance. The combined exclusive friction resistance and mechanical performance were the paramount factors which illustrate the applications of the resultant PI/AGNS nanocomposites in the wear-resistant field or another high-performance material.
关键词： graphene nanosheets,mechanical properties,polyimide nanocomposites,tribological performance,Friedel–Crafts reaction
更新于2025-09-04 15:30:14