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 aDEME][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 similar to 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 mu(k) obtained from the tribotests of [DEME] [BF4] were lower than that of [DEME] [TFSI] for sliding velocities in the range of 5.0 X 10(-4)m s(-1) to 3.0 x 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.
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机译：为了评估新型润滑系统的摩擦性能，使用了两种类型的铵基离子液体（ILs）：四氟硼酸N，N-二乙基-N-甲基-N-（2-甲氧基乙基）铵（[DEME] [BF4]）和N，N-二乙基-N-甲基-N-（2-甲氧基乙基）双（三氟甲磺酰基）酰亚胺铵盐[DEME] [TFSI]），通过共振剪切测量（RSM）和二氧化硅（玻璃）表面之间的往复式摩擦试验研究。 RSM揭示，约IL的IL层。在0.40 mN的施加载荷（类似于1.2 mN）下，在二氧化硅表面之间保持2 nm的厚度。 RMS信号的相对强度表明，[DEME] [BF4]的系统摩擦小于0.12，而[DEME] [TFSI]的系统摩擦小于0.18。另一方面，从[DEME] [BF4]的摩擦试验获得的摩擦系数mu（k）低于[DEME] [TFSI]的摩擦系数，滑动速度范围为5.0 X 10（-4）ms（ -1）至3.0 x 10（-2）ms（-1）在196-980 mN的施加载荷下。参照RSM结果讨论了通过摩擦试验获得的摩擦系数。
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