Effect of water on the interfacial structures of room‐temperature ionic liquids | Zendy

Kawada Shouhei | Zendy; Kodama Eri | Zendy; Sato Keisuke | Zendy; Ogawa Shuhei | Zendy; Watanabe Masaya | Zendy; Okubo Hikaru | Zendy; Sasaki Shinya | Zendy

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

Author(s) -

Kawada Shouhei,

Kodama Eri,

Sato Keisuke,

Ogawa Shuhei,

Watanabe Masaya,

Okubo Hikaru,

Sasaki Shinya

Publication year - 2019

Publication title -

surface and interface analysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.52

H-Index - 90

eISSN - 1096-9918

pISSN - 0142-2421

DOI - 10.1002/sia.6536

Subject(s) - dicyanamide , ionic liquid , fourier transform infrared spectroscopy , tribology , chemistry , atomic force microscopy , layer (electronics) , infrared spectroscopy , chemical engineering , molecular dynamics , ionic bonding , ion , materials science , analytical chemistry (journal) , composite material , nanotechnology , computational chemistry , organic chemistry , catalysis , engineering

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% H 2 O solution. FT‐IR results indicated that the layer structure of [EMIM][DCN] was disturbed by the addition of H 2 O. Therefore, the solution containing water exhibited a high friction force.

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