Influence of the Crystallinity on the Tribological Behavior of MoS2 Nanoparticles Stabilized by a Succinimide Dispersant

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2025-02-11 DOI:10.1007/s11249-025-01972-7

Marina Benmansour, Pavel Afanasiev, Jules Galipaud, Béatrice Vacher, Lucile Joly-Pottuz, Fabrice Dassenoy

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Abstract

This study investigates the influence of the crystallinity of MoS₂ nanoparticles on their tribological performance, when used as lubricant additives in presence of a succinimide-based dispersant. Friction tests were conducted at room temperature and 100 °C. Characterization techniques, such as TEM, XPS, TGA, and DLS were used to analyze the structural and chemical properties of the nanoparticles and the tribofilms formed during the friction tests. At room temperature, low crystallinity nanoparticles show superior friction reduction due to their structural defects which facilitate their exfoliation and make easier dispersant adsorption and effective nanoparticle interaction with surfaces. Higher friction coefficients are obtained with the high crystallinity nanoparticles. This is attributed to a less easy exfoliation of the nanoparticles together with greater difficulty for the dispersant to interact with closed-structure nanoparticles. The tribofilm is thicker with high crystallinity particles and made of exfoliated MoS₂ sheets together with intact nanoparticles. At 100 °C, the friction performance of both nanoparticles are similar and very good as the dispersant looks to desorb from the rubbing surfaces, highlighting the significant impact of temperature on dispersant behavior and friction reduction. These findings underline the importance of tailoring lubricant formulations to both the crystallinity of MoS₂ nanoparticles and the operating conditions in order to optimize tribological performance.

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.