| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Lubrication Mechanism of Phosphonium Phosphate Ionic Liquid: a Combined In Situ Atomic Force Microscopy and Ex Situ Surface Spectroscopic Study |
| Author(s) |
Filippo Mangolini, Zixuan Li, Oscar Morales-Collazo, Jerzy T Sadowski, Hugo Celio, Andrei Dolocan, Joan F Brennecke |
| On-Site Speaker (Planned) |
Filippo Mangolini |
| Abstract Scope |
Phosphonium phosphate ionic liquids (PP-ILs) have attracted considerable attention in tribology owing to their high thermal stability, low vapor pressure, good miscibility in hydrocarbon fluids, and excellent lubrication performance. Despite the scientific weight of previous macro-scale tribological studies of PP-ILs, a fundamental understanding of the underpinning nanoscale lubrication mechanism is still lacking. Here, we used atomic force microscopy (AFM) to visualize and quantify the processes occurring at sliding interfaces in situ, in well-defined single-asperity nanocontacts. The AFM experiments, in which a diamond tip was slid on steel in PP-IL, indicated a significant reduction in friction only after the removal of the native oxide surface layer from steel. Based on subsequent laterally-resolved ex situ analyses of the surface chemistry of steel by X-ray photoemission electron microscopy, low energy electron microscopy, and time-of-flight secondary ion mass spectrometry, a simple phenomenological model will be proposed to account for the observed tribological behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Thin Films and Interfaces, Mechanical Properties |