title: Lubrication Properties of Ammonium-Based Ionic Liquids Confined between Silica Surfaces Using Resonance Shear Measurements.
abstract: To evaluate the friction properties of new lubrication systems, two types of ammonium-based ionic liquids (ILs), N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate ([DEME][BF4]) and N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium bis(trifluoromethanesulfonyl) imide ([DEME][TFSI]), were investigated by resonance shear measurements (RSM) and reciprocating type tribotests between silica (glass) surfaces. RSM revealed that an IL layer of ca. 2 nm in thickness was maintained between the silica surfaces under an applied load of 0.40 mN ∼ 1.2 mN. The relative intensity of the RMS signal indicated that the friction of the system was lower for [DEME][BF4], 0.12, than that of [DEME][TFSI], 0.18. On the other hand, the friction coefficients μk obtained from the tribotests of [DEME][BF4] were lower than that of [DEME][TFSI] for sliding velocities in the range of 5.0 × 10(-4) m s(-1) to 3.0 × 10(-2) m s(-1) under applied loads of 196-980 mN. The friction coefficients obtained by the tribotest are discussed with reference to the RSM results.
authors.affiliation: Department of Creative Engineering, National Institute of Technology, Tsuruoka College , Sawada, Inooka, Tsuruoka, 997-8511, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Kamijo
authors.affiliation: Department of Creative Engineering, National Institute of Technology, Tsuruoka College , Sawada, Inooka, Tsuruoka, 997-8511, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Arafune
authors.affiliation: Department of Creative Engineering, National Institute of Technology, Tsuruoka College , Sawada, Inooka, Tsuruoka, 997-8511, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Morinaga
authors.affiliation: Department of Creative Engineering, National Institute of Technology, Tsuruoka College , Sawada, Inooka, Tsuruoka, 997-8511, Japan.
authors.forename: Saika
authors.initials: S
authors.lastname: Honma
authors.affiliation: Department of Creative Engineering, National Institute of Technology, Tsuruoka College , Sawada, Inooka, Tsuruoka, 997-8511, Japan.
authors.forename: Takaya
authors.initials: T
authors.lastname: Sato
authors.forename: Masaya
authors.initials: M
authors.lastname: Hino
authors.forename: Masashi
authors.initials: M
authors.lastname: Mizukami
authors.forename: Kazue
authors.initials: K
authors.lastname: Kurihara