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@article{Song:2023:10.1007/s40544-022-0614-9,
author = {Song, W and Zhang, J and Campen, S and Yan, J and Hongbing, J and Wong, J},
doi = {10.1007/s40544-022-0614-9},
journal = {Friction},
pages = {425--440},
title = {Lubrication mechanism of a strong tribofilm by imidazolium ionic liquid},
url = {http://dx.doi.org/10.1007/s40544-022-0614-9},
volume = {11},
year = {2023}
}
TY - JOUR
AB - Friction modifiers are surface-active additives added to base fluids to reduce frictionbetween rubbing surfaces. Their effectiveness depends on their interactions with rubbingsurfaces and may be mitigated by the choice of the base fluid. In this work, theperformance of an imidazolium ionic liquid (ImIL) additive in polyethylene-glycol (PEG)and 1,4-butanediol for lubricating steel/steel and diamond-like-carbon/diamond-likecarbon (DLC-DLC) contacts were investigated. ImIL containing PEG reduces frictionmore effectively in steel-steel than DLC-DLC contacts. In contrast, adding ImIL in1,4-butanediol results in an increase in friction in steel-steel contacts. Results fromRaman spectroscopy, XPS and FIB-TEM reveal that a surface film is formed on steelduring rubbing in ImIL containing PEG. This film consists of two layers. The top layer iscomposed of amorphous carbon and are easily removed during rubbing. The bottom layer,which contains iron oxide and nitride compound, adheres strongly on the steel surface.This film maintains its effectiveness in a steel-steel contact even after ImIL additives are2depleted. Such film is not observed in 1,4-butanediol where the adsorption of ImIL ishindered, as suggested by QCM measurements. No benefit is observed when the basefluid on its own is sufficiently lubricious, as in the case of DLC surfaces.This work provides fundamental insights on how compatibilities among base fluid,friction modifier and rubbing surface affect performance of IL as surface active additives.It reveals the structure of an ionic liquid surface film, which is effective and durable. Theknowledge is useful for guiding future IL additive development.
AU - Song,W
AU - Zhang,J
AU - Campen,S
AU - Yan,J
AU - Hongbing,J
AU - Wong,J
DO - 10.1007/s40544-022-0614-9
EP - 440
PY - 2023///
SN - 2223-7690
SP - 425
TI - Lubrication mechanism of a strong tribofilm by imidazolium ionic liquid
T2 - Friction
UR - http://dx.doi.org/10.1007/s40544-022-0614-9
UR - http://hdl.handle.net/10044/1/95966
VL - 11
ER -