Preparation of Graphene and Its Tribological Properties Based on Deep Eutectic Solvent Stripping Method

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-09-24 DOI:10.1007/s11249-024-01919-4

Ting Li, Yun Chen, Rui Wang, Junhai Wang, Xinran Li, Lixiu Zhang

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Abstract

Graphene (GP), when used as a lubricant additive, not only reduces the friction coefficient but also enhances wear resistance by forming a protective lubrication film. However, there are still several challenges in practical applications related to graphene preparation. Therefore, this study employs a novel type of ionic liquid deep eutectic solvent as an interlayer agent for graphene preparation and investigates its tribological properties when used as an additive. We used choline chloride/ethylene glycol deep eutectic solvent as the intercalation agent and successfully prepared graphene samples using liquid-phase exfoliation. The resulting graphene samples had a thickness of 4–5 layers. The peeling mechanism is analyzed through molecular dynamics simulations and characterization techniques such as Raman spectroscopy, XRD, SEM, and AFM. In friction experiments conducted with different mass fractions of 1.5 wt% DES and 0.05 wt% GP as lubricant additives, it is observed that the mixture exhibits optimal lubrication performance compared to base oil alone; specifically reducing average friction coefficient by 56.8% and depth of wear marks by 59.8%. This enhancement in friction performance can be attributed to both high wettability and synergistic effects between composite lubricants. Considering the wide range of available DESs and two-dimensional materials, these newly developed functional two-dimensional materials based on DES hold significant research potential.

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基于深共晶溶剂剥离法制备石墨烯及其摩擦学特性

石墨烯（GP）用作润滑油添加剂时，不仅能降低摩擦系数，还能通过形成保护性润滑膜提高耐磨性。然而，石墨烯的制备在实际应用中仍面临一些挑战。因此，本研究采用了一种新型离子液体深共晶溶剂作为石墨烯制备的层间剂，并研究了其作为添加剂使用时的摩擦学特性。我们使用氯化胆碱/乙二醇深共晶溶剂作为插层剂，利用液相剥离法成功制备了石墨烯样品。所制备的石墨烯样品厚度为 4-5 层。通过分子动力学模拟以及拉曼光谱、XRD、SEM 和原子力显微镜等表征技术分析了剥离机理。在使用不同质量分数的 1.5 wt% DES 和 0.05 wt% GP 作为润滑油添加剂进行的摩擦实验中观察到，与单独使用基础油相比，该混合物具有最佳的润滑性能；特别是平均摩擦系数降低了 56.8%，磨损痕迹深度降低了 59.8%。摩擦性能的提高可归因于高润湿性和复合润滑剂之间的协同效应。考虑到现有的 DES 和二维材料种类繁多，这些基于 DES 新开发的功能性二维材料具有巨大的研究潜力。

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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.