Dispersion of reduced nanodiamond and its application in lubrication

Zhong, Huiying; Wang, Qian; Qu, Jiaying; Li, Xiaoqing; Mukerabigwi, Jean Felix; Asibaike, Laizaiti; Fang, Yuli; Cao, Yu

doi:10.1016/j.mtcomm.2023.106999

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…7 Nanomaterials have been proposed as potential candidates for lubricant additives due to their small size, super diffusion ability, and high chemical reactivity. 8 Carbon nanomaterials are one of the most prominent components of nanomaterials because of their novel structure, including graphene, 9 onionlike carbon, 10 nanodiamonds, 11 and so on. They have attracted considerable interest as promising candidates for frictionreducing and antiwear additives due to their high mechanical robustness, thermal conductivity and stability, biocompatibility, and nontoxicity.…”

Section: ■ Introductionmentioning

confidence: 99%

Dynamic Directional Ultrasonically In Situ-Generated N,S-Codoped Carbon Dots in Poly(ethylene glycol) for Improved Tribological Performance

Jin,

Cui,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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The dispersion stability of nanomaterials in lubricants significantly influences tribological performance, yet their addition as lubricant additives often presents challenges in secondary dispersion. Here, we present a straightforward method for in situ preparation of N,S-codoped CDs (N,S-CDs)-based lubricants using heterocyclic aromatic hydrocarbons containing N/ S elements in poly(ethylene glycol) (PEG) base oil by a directional ultrasound strategy. Two types of N,S-CDs were successfully prepared via the directional ultrasound treatment of PEG with benzothiazole (BTA) and benzothiadiazole (BTH) separately. The resultant N,S-CDs have a uniform distribution of N and S elements and maintain good colloidal dispersion stability in PEG even after 9 months of storage. The N,S-CDs can enter the surface gap of the friction pairs and then induce a tribochemical reaction. Benefiting from the synergistic effect of N and S activating elements, a robust and stable protective film consisting of iron sulfides, iron oxides, carbon nitrides, and amorphous carbonaceous compounds is formed, thus endowing N,S-CDs-based lubricants with improved antiwear and friction-reducing performance. Compared with pure PEG, the coefficient of friction (COF) of the N,S-CDs(BTH)-based lubricant decreased to 0.108 from 0.292, accompanied by a 91.2% reduction in wear volume, and the maximum load carrying capacity increased to 450 from 150 N.

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