Physicochemical and tribological comparison of bio- and halogen-based ionic liquid lubricants
Physicochemical and tribological comparison of bio- and halogen-based ionic liquid lubricants
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DOI：
10.1016/j.molliq.2022.120918
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发表时间：
2022-11
影响因子：
6
通讯作者：
M. Hafizur Rahman;Ting Liu;Tatianna Macias;M. Misra;Manish Patel;A. Martini;P. Menezes
中科院分区：
文献类型：
--
作者：
M. Hafizur Rahman;Ting Liu;Tatianna Macias;M. Misra;Manish Patel;A. Martini;P. Menezes
研究了生物基糖化三己基十四烷基膦盐[P6，6，6，14][SACC]和卤基三己基十四烷基膦双(三氟甲基磺酰基)酰胺[P6，6，6，14][NTF2]离子液体(ILS)的摩擦磨损行为，以了解它们在钢滑动界面上的润滑机理。在很宽的温度范围内(10-120℃)对ILS的物理化学和摩擦学特性进行了表征，以反映风力涡轮机应用中的条件。两种离子液体的摩擦力都随着温度的升高而增加。在任何温度下，[P6，6，6，14][Sacc][SACC]的粘度都比卤素[P6，6，6，14][NTF2]高得多，提供了更厚的润滑膜，进而提供了更好的摩擦和磨损保护。与[P6，6，14][NTF2]相比，[P6，6，14][Sacc]具有更低的密度、相当的热稳定性、更好的润湿性和更好的腐蚀性能。模拟结果表明，由于[P-Sacc]的阴阳离子距离较小，其内聚相互作用能较强。[P6，6，6，14][Sacc][Sacc]比[P6，6，6，14][NTF2]具有更高的粘度和更强的内聚力，有助于生物基IL形成有效的吸附膜，从而在一定温度范围内减少摩擦和磨损。
The friction and wear behavior of bio-based trihexyltetradecylphosphonium saccharinate [P6,6,6,14][Sacc] and halogen-based trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl) amide [P6,6,6,14][NTF2] ionic liquids (ILs) were studied to understand their lubrication mechanisms at steel sliding interfaces. The physicochemical and tribological properties of the ILs were characterized over a wide temperature range (10–120 ℃) to reflect the conditions present in wind turbine applications. Friction increased with increasing temperature for both ILs. At any temperature, [P6,6,6,14][Sacc] had significantly higher viscosity that provided thicker lubricant films and, in turn, better friction and wear protection than the halogen-based [P6,6,6,14][NTF2]. [P6,6,6,14][Sacc] also had lower density, comparable thermal stability, more favorable wettability, and better corrosion performance than [P6,6,6,14][NTF2]. Simulations showed that the cohesion interaction energy was stronger for [P-Sacc] due to its smaller anion-cation distance. The higher viscosity and stronger cohesion of [P6,6,6,14][Sacc] than [P6,6,6,14][NTF2] contributed to the ability of the bio-based IL to form an effective adsorption film that reduced friction and wear across a range of temperatures.