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Superlubrication obtained with mixtures of hydrated ions and polyethylene glycol solutions in the mixed and hydrodynamic lubrication regimes.
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-06-25 , DOI: 10.1016/j.jcis.2020.06.095
Tianyi Han 1 , Shuang Yi 2 , Chenhui Zhang 2 , Jinjin Li 2 , Xinchun Chen 2 , Jianbin Luo 2 , Xavier Banquy 3
Affiliation  

Hypothesis

Superlubricity is known to dramatically reduce frictional energy consumption and to improve service life of mechanical devices and biological systems. However, reduction of wear during the running-in period of friction pairs, especially under high contact pressures, still remains an unresolved issue affecting all machines.

Experiments

Here the lubrication, adsorption, and conformational properties of hydrated ions and polyethylene glycol (PEG) mixtures were evaluated at different mass fractions and concentrations of PEG and salts by ball-on-disc tribometer, ζ-potential, quartz crystal microbalance with dissipation (QCM-D), and dynamic light scatting (DLS) analyses.

Findings

These mixtures exhibited superlubricity between Si3N4 and sapphire surfaces in a wide range of concentrations and ions valency. Interestingly, a running-in phase shorter than 1 min and low wear rate of 1.85 μm3/(N·m) were observed at contact pressures up to 555 MPa, significantly higher to earlier findings. PEG chains retain random coils filling the bulk of the interfacial film without strongly adsorbing on the interfaces but significantly increasing the viscosity of lubricating film, thereby favoring hydrodynamic lubrication. Hydrated ions are strongly adsorbed on the negatively charged ceramic surfaces, ensuring a sustained hydration effect maintaining superlubricity. The outstanding lubrication characteristics of the PEG/ions mixtures were attributed to the synergistic action of hydration and hydrodynamic lubrication, which appears as a promising avenue for developing new green lubricants and has implications for industrial and biological applications.



中文翻译:

在混合润滑和流体动力润滑方案中,通过水合离子和聚乙二醇溶液的混合物获得的超润滑。

假设

众所周知,超润滑可显着降低摩擦能量消耗并提高机械设备和生物系统的使用寿命。但是,减少摩擦副磨合期间的磨损,特别是在高接触压力下,仍然是一个尚未解决的问题,影响了所有机器。

实验

在这里,通过圆盘摩擦计在不同质量分数和浓度的PEG和盐的情况下评估了水合离子和聚乙二醇(PEG)混合物的润滑,吸附和构象特性, ζ电位,带耗散的石英晶体微天平(QCM-D)和动态光散射(DLS)分析。

发现

这些混合物在很宽的浓度范围和离子价态下在Si 3 N 4和蓝宝石表面之间显示出超润滑性。有趣的是,一个磨合期短于1分钟和1.85微米低磨损率3/(N·m)在最高555 MPa的接触压力下观察到,大大高于先前的发现。PEG链保留无规卷曲,填充了大部分界面膜,而没有在界面上强烈吸附,但显着增加了润滑膜的粘度,从而有利于流体动力润滑。水合离子强烈吸附在带负电的陶瓷表面上,确保持续的水合作用,保持超润滑性。PEG /离子混合物的出色润滑特性归因于水合作用和流体动力润滑的协同作用,这似乎是开发新型绿色润滑剂的有前途的途径,对工业和生物应用具有重要意义。

更新日期:2020-07-02
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