Journal
SURFACE AND INTERFACE ANALYSIS
Volume 51, Issue 1, Pages 17-20Publisher
WILEY
DOI: 10.1002/sia.6536
Keywords
room-temperature ionic liquids; water; atomic force microscopy; Fourier transform infrared spectroscopy
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Funding
- Water Frontier Science and Technology Research Center, Research Institute for Science and Technology, Tokyo University of Science
- JSPS KAKENHI [15J05958, JP16H02310, JP26630041]
- Grants-in-Aid for Scientific Research [15J05958] Funding Source: KAKEN
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The interfacial structures of cyano-based room-temperature ionic liquids play a very important role in reducing friction. However, the presence of water impairs their tribological performance. The interfacial structures and friction forces of 1-ethyl-3-methylimidazolium dicyanamide, [EMIM][DCN], and the effect of water on these structures and forces were investigated using atomic force microscopy. In addition, the interaction of water and [EMIM][DCN] was evaluated using Fourier-transform infrared (FT-IR) spectroscopy. Multiple repulsive layers were observed in the [EMIM][DCN] solution. This solution showed low friction force because these repulsive layers worked as protective layers against friction. On the other hand, the specific repulsive layer characteristics of [EMIM][DCN] could not be observed in a [EMIM][DCN] + 2 wt% H2O solution. FT-IR results indicated that the layer structure of [EMIM][DCN] was disturbed by the addition of H2O. Therefore, the solution containing water exhibited a high friction force.
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