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
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DOI：
10.1021/acs.langmuir.5b03354
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发表时间：
2015-12-15
期刊：
影响因子：
3.9
通讯作者：
Kurihara, Kazue
中科院分区：
文献类型：
--
作者：
Kamijo, Toshio;Arafune, Hiroyuki;Kurihara, Kazue
为了评估新型润滑系统的摩擦性能，通过共振剪切研究了两种铵基离子液体 (IL)：N,N-二乙基-N-甲基-N-(2-甲氧基乙基) 四氟硼酸铵 ([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 aDEME][TFSI])测量（RSM）和二氧化硅（玻璃）表面之间的往复式摩擦测试。 RSM 揭示了约 1 个 IL 层。在施加类似于 1.2 mN 的 0.40 mN 负载下，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] 的系统摩擦力为 0.12，低于 [DEME] [TFSI] 的系统摩擦力 0.18。另一方面，在 196-980 mN 的外加载荷下，滑动速度在 5.0 X 10(-4)m s(-1) 至 3.0 x 10(-2) m s(-1) 范围内时，从 [DEME] [BF4] 的摩擦测试中获得的摩擦系数 mu(k) 低于 [DEME] [TFSI]。参考RSM结果讨论了摩擦试验获得的摩擦系数。
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.