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

IF 3.3 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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结晶度对琥珀酰亚胺分散剂稳定二硫化钼纳米颗粒摩擦学行为的影响

本研究考察了二硫化钼纳米颗粒的结晶度对其摩擦学性能的影响，当使用琥珀酰亚胺基分散剂作为润滑剂添加剂时。在室温和100℃条件下进行摩擦试验。利用TEM、XPS、TGA和DLS等表征技术分析了纳米颗粒的结构和化学性质以及摩擦试验中形成的摩擦膜。在室温下，低结晶度纳米颗粒由于其结构缺陷而表现出优异的摩擦减少性，这有利于其剥离，使分散剂更容易吸附，纳米颗粒与表面有效相互作用。高结晶度的纳米颗粒具有较高的摩擦系数。这是由于纳米颗粒不易脱落，同时分散剂与封闭结构纳米颗粒相互作用的难度更大。摩擦膜更厚，具有高结晶度的颗粒，由脱落的二硫化钼片和完整的纳米颗粒组成。在100°C时，两种纳米颗粒的摩擦性能相似且非常好，因为分散剂看起来会从摩擦表面解吸，这突出了温度对分散剂行为和摩擦减少的重要影响。这些发现强调了根据二硫化钼纳米颗粒的结晶度和操作条件定制润滑油配方的重要性，以优化摩擦学性能。

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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.