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Lubrication Properties of Ammonium-Based Ionic Liquids Confined Between Silica Surfaces Using Resonance Shear Measurements

Lubrication Properties of Ammonium-Based Ionic Liquids Confined Between Silica Surfaces Using Resonance Shear Measurements

Toshio Kamijo, Hiroyuki Arafune, Takashi Morinaga, Saika Honma, Takaya Sato, Masaya Hino, Masashi Mizukami, Kazue Kurihara

Langmuir. 2015 Dec 15;31(49):13265-70.

PMID: 26602172

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13826830	Ammonium tetrafluoroborate		13826-83-0	Price

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