Effect of water on the interfacial structures of room-temperature ionic liquids

被引：10
|
作者：
Kawada, Shouhei [1 ]
Kodama, Eri [2 ]
Sato, Keisuke [2 ]
Ogawa, Shuhei [2 ]
Watanabe, Masaya [2 ]
Okubo, Hikaru [2 ]
Sasaki, Shinya [1 ]
机构：
[1] Tokyo Univ Sci, Dept Mech Engn, Katsushika Ku, 6-3-1 Niijuku, Tokyo 1258585, Japan
[2] Tokyo Univ Sci, Grad Sch, Dept Mech Engn, Katsushika Ku, 6-3-1 Niijuku, Tokyo 1258585, Japan
来源：
SURFACE AND INTERFACE ANALYSIS | 2019年 / 51卷 / 01期
关键词：
room-temperature ionic liquids; water; atomic force microscopy; Fourier transform infrared spectroscopy;
D O I：
10.1002/sia.6536
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：17 / 20
页数：4
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