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Task–specific Ionic Liquids Based on Sulfur for Tribological Applications
Author(s) -
Cosme João,
Bastos Pedro D. A.,
Catela Isabelle,
Silva Diana,
Colaço Rogério,
Branco Luís C.,
Saramago Benilde
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600880
Subject(s) - nanoelectromechanical systems , lubricant , ionic liquid , microelectromechanical systems , materials science , tribology , lubrication , sulfur , silicon , nanotechnology , ion , chemical engineering , inorganic chemistry , organic chemistry , chemistry , composite material , catalysis , metallurgy , nanoparticle , engineering , nanomedicine
Ionic liquids (ILs) have been recently considered as potentially adequate lubricants for microelectromechanical and nanoelectromechanical systems ( MEMS/NEMS) due to the specific features of these silicon based miniaturized devices. Aiming at the optimization of the lubrication of MEMS/NEMS, new ILs resulting from the combination of sulfur‐containing anions (bis(2‐ethyl‐1‐hexyl) sulfosuccinate, [AOT], and ethylsulphate, [C 2 SO 4 ]) with ammonium, imidazolium or methylpyridinium based cations were prepared. Their tribological performance against silicon and steel was assessed with a nanotribometer and compared to that of other ILs based on the cation 1‐ethyl 3‐methylimidazolium, [C 2 MIM]. Our results reveal that the presence of the anion [C 2 SO 4 ] is responsible for very low friction coefficients on silicon, meaning that these ILs may be considered as promising lubricants for MEMS/ NEMS. In contrast, the anion [AOT] did not lead to efficient lubricants for this type of systems. The results obtained on steel were not so impressive, although all the ILs based on [C 2 SO 4 ] presented better lubricant capacities than commercial oil.