Resonance shear measurement of nanoconfined ionic liquids.
Resonance shear measurement of nanoconfined ionic liquids.
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DOI：
10.1039/b923571j
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
K. Ueno;Motohiro Kasuya;M. Watanabe;M. Mizukami;K. Kurihara
中科院分区：
文献类型：
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作者：
K. Ueno;Motohiro Kasuya;M. Watanabe;M. Mizukami;K. Kurihara
通过基于表面力装置 (SFA) 的共振剪切测量和表面力研究，限制在二氧化硅表面之间的两种类型的咪唑基离子液体 (IL)：1-丁基-3-甲基咪唑鎓双(三氟甲磺酰基)酰胺 ([C(4)mim][NTF(2)]) 和 1-丁基-3-甲基咪唑鎓四氟硼酸盐 ([C(4)mim][BF(4)])力测量。 IL 中的表面力分布显示振荡溶剂化力低于特征表面分离：[C(4)mim][NTf(2)] 为 10.0 nm，[C(4)mim][BF(4)] 为 6.9 nm。 [C(4)mim][NTf(2)] 中发现的更明显的溶剂化力表明 IL 的晶体形成能力有助于邻近表面的 IL 更强的分层。共振剪切测量和物理模型分析表明，受限离子液体的粘度比本体液体液体的粘度高 1-3 个数量级。本文还重点研究了离子液体的共振剪切行为和润滑性能之间的相关性，以及离子液体中的悬浮液流变学。对固体-IL 界面和限制在纳米空间中的 IL 的了解将有助于进一步开发采用 IL 的新颖应用。
Two types of imidazolium-based ionic liquid (IL), 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([C(4)mim][NTF(2)]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([C(4)mim][BF(4)]), confined between silica surfaces were investigated by surface force apparatus (SFA)-based resonance shear measurements together with surface force measurements. The surface force profiles in the ILs showed oscillatory solvation forces below the characteristic surface separations: 10.0 nm for [C(4)mim][NTf(2)] and 6.9 nm for [C(4)mim][BF(4)]. The more pronounced solvation force found in [C(4)mim][NTf(2)] suggests that the crystal-forming ability of the IL contributes to the stronger layering of the ILs adjacent to the surface. The resonance shear measurement and the physical model analysis revealed that the viscosities of the confined ILs were 1-3 orders of magnitude higher than that of the bulk IL. This paper also focused on the correlation between the resonance shear behaviour and the lubrication property of the ILs, and the suspension rheology in the ILs. An understanding of the solid-IL interface and of ILs confined in nanospace will facilitate the further development of novel applications employing ILs.