Rheological Characteristics of Ionic Liquids under Nanoconfinement
Rheological Characteristics of Ionic Liquids under Nanoconfinement
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DOI：
10.1021/acs.langmuir.1c03460
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发表时间：
2022-02-27
期刊：
影响因子：
3.9
通讯作者：
Espinosa-Marzal, Rosa M.
中科院分区：
文献类型：
--
作者：
Han, Mengwei;Rogers, Simon A.;Espinosa-Marzal, Rosa M.
虽然离子液体（IL）在纳米约束中的动力学性质在基于IL的电化学和机械装置的性能中起着至关重要的作用，但实验工作大多在报道“类固体”与“类液体”行为方面福尔斯不足。目前的工作是第一个进行频率扫描的剪切流变学IL纳米膜，调和固体与液体的辩论，并揭示了剪切速率的行为的重要性。我们解开和分析的粘弹性纳米限制离子液体和阐明其松弛机制。此外，主曲线描述了四个（非氢键）离子液体的动态行为的缩放下nanoconfinition，并揭示了流动单元的可压缩性的作用。
While the dynamic properties of ionic liquids (ILs) in nanoconfinement play a crucial role in the performance of IL-based electrochemical and mechanical devices, experimental work mostly falls short at reporting "solid-like" versus "liquid-like" behavior of confined ILs. The present work is the first to conduct frequency-sweep oscillatory-shear rheology on IL nanofilms, reconciling the solid-versus-liquid debate and revealing the importance of shear rate in the behavior. We disentangle and analyze the viscoelasticity of nanoconfined ILs and shed light on their relaxation mechanisms. Furthermore, a master curve describes the scaling of the dynamic behavior of four (non-hydrogen-bonding) ILs under nanoconfinement and reveals the role of the compressibility of the flow units.