Synthesis of Novel Deep Eutectic Solvents for Ultralow Wear Performance at the Steel/Steel Interface under High Pressure

作者：Yongliang Gao, Changhe Du, Liqiang Zhang, Liucheng Wang, Yu Jia, Linxu Fang, Xiaojuan Li, Ying Liu, Daoai Wang · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2025 · DOI：10.1021/acssuschemeng.5c05698 · 被引用次数：8 · 研究领域：Ionic liquids properties and applications、Thermal and Kinetic Analysis、Lubricants and Their Additives

Deep eutectic solvents (DESs) have attracted widespread attention in the lubrication field, yet achieving effective steel–steel wear resistance remains challenging. This study develops a thiodisuccinic acid/trioctylphosphine oxide-based deep eutectic solvent (DES) with tunable hydrogen-bonding networks for steel/steel interface lubrication. At a 1:4 molar ratio, the DES achieves a friction coefficient of 0.05 and an ultralow wear rate (4.44 × 10 –9 mm 3 ·N –1 ·m –1 ) under 1.08 GPa contact pressure. Remarkably, the DES exhibits sustained lubricity, maintaining a wear rate of 1.13 × 10 –8 mm 3 ·N –1 ·m –1 after 110,000 cycles. The key lubrication mechanism is attributed to the multihydrogen-bonding network that enhances lubricant film load-carrying capacity and mixed lubrication. This work presents a novel approach for engineering high-performance DESs with exceptional antiwear properties for steel surfaces.