Mesoscale Organization and Dynamics in Binary Ionic Liquid Mixtures
Mesoscale Organization and Dynamics in Binary Ionic Liquid Mixtures
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DOI：
10.1021/acs.jpclett.9b02478
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发表时间：
2019-10-17
影响因子：
5.7
通讯作者：
Sangoro, Joshua
中科院分区：
文献类型：
--
作者：
Cosby, Tyler;Kapoor, Utkarsh;Sangoro, Joshua
通过宽带介电谱、动态力学谱、X射线散射和分子动力学模拟研究了介观组织对二元离子液体混合物动力学和离子输运的影响。发现混合物形成具有明显偏离净组分的加权贡献的宏观性质的不同液体。例如，它示出了在离子液体中的介观形态可以通过混合来调谐，以相对于纯离子液体组分将所得液体的静态介电常数提高高达100%。这种增强归因于与这些系统中的介观聚集体形态的变化相关联的界面动力学的复杂作用。这些结果表明，通过控制疏溶剂聚集来设计离子液体的物理化学性质的潜力。
The impact of mesoscale organization on dynamics and ion transport in binary ionic liquid mixtures is investigated by broad-band dielectric spectroscopy, dynamic-mechanical spectroscopy, X-ray scattering, and molecular dynamics simulations. The mixtures are found to form distinct liquids with macroscopic properties that significantly deviate from weighted contributions of the neat components. For instance, it is shown that the mesoscale morphologies in ionic liquids can be tuned by mixing to enhance the static dielectric permittivity of the resulting liquid by as high as 100% relative to the neat ionic liquid components. This enhancement is attributed to the intricate role of interfacial dynamics associated with the changes in the mesoscopic aggregate morphologies in these systems. These results demonstrate the potential to design the physicochemical properties of ionic liquids through control of solvophobic aggregation.