Influence of Structure, Interionic Interactions, Interfacial slip and Viscous-electric Coupling Phenomena on the Rheology of Nanoconfined Ionic Liquids

结构、离子间相互作用、界面滑移和粘电耦合现象对纳米限域离子液体流变性的影响

基本信息

批准号：
1916609
负责人：
Rosa Espinosa-Marzal
金额：
$ 35万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-06-01 至 2025-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1916609&HistoricalAwards=false
关键词：
Influence Structure Interionic Interactions Interfacial

项目摘要

The overall goal of this project is to advance the knowledge about structure-property relationships for ionic liquids, which are organic molten salts with tunable compositions. Besides high ionic conductivity, ionic liquids exhibit low volatility, good thermal stability, low flammability, and a wide electrochemical window. These properties could enable safe energy storage devices with higher energy and power density and longer-term stability than is possible with current technologies. However, the performance of these devices depends on the viscosity of the ionic liquids in extremely narrow spaces, and their high viscosity has been linked to reduced electrical conductivity and capacitance, poor wetting of porous electrodes, and lower power density. Therefore, research that addresses the flow characteristics of nanoconfined ionic liquids is of paramount importance. This project will examine the relationship between liquid composition and flow behavior in nanoscale channels. Thereby, it will enable to establish design principles of ionic liquids as electrolytes for next-generation supercapacitor and battery technologies. The proposed research will also contribute to the development of the US work force by training two graduate research assistants at the intersection between materials chemistry and engineering, interfacial science, and rheology. This multi-disciplinary approach will help broaden participation of underrepresented groups in research and benefit engineering education. The research project will address three major issues in the flow of nanoconfined ionic liquids: the relationship between liquid structure and nanorheology, the effects of surface composition (wettability) and nanoscale roughness on material behavior, and the connection between electrostatic and viscous phenomena. The experimental study will use a surface forces apparatus by confining the liquids between two surfaces with controlled characteristics. Measurements of static and hydrodynamic forces as well as dynamic shear will be carried out on a set of judiciously selected ionic liquids with a wide range of compositions. The findings of these studies will be used to develop a framework to predict the rheology of nanoconfined ionic liquids. Furthermore, the knowledge generated by this research will enable practitioners to modulate the nanorheological response of ionic liquids through the precise control of their structure, surface wettability, roughness and potential.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的总体目标是促进有关离子液体结构质体关系的知识，它们是具有可调成分的有机熔融盐。除了高离子电导率外，离子液体还表现出较低的波动性，良好的热稳定性，低易燃性和广泛的电化学窗口。这些属性可以比当前技术实现具有更高能量和功率密度和长期稳定性的安全能量存储设备。但是，这些设备的性能取决于极狭窄的离子液体的粘度，并且它们的高粘度与降低的电导率和电导率，多孔电极的润湿性较差以及较低的功率密度有关。因此，解决纳米结合离子液体的流量特征的研究至关重要。该项目将检查纳米级通道中液体组成与流动行为之间的关系。因此，它将能够建立离子液体的设计原理，作为下一代超级电容器和电池技术的电解质。拟议的研究还将通过培训材料化学与工程，界面科学和流变学之间的相交的两名研究生研究助理来为美国劳动力的发展做出贡献。这种多学科的方法将有助于扩大代表性不足的研究和利益工程教育的参与。该研究项目将解决纳米结合的离子液体流动中的三个主要问题：液体结构与纳米流行病学之间的关系，表面组成（润湿性）和纳米级粗糙度对材料行为的影响以及静电和粘性现象之间的联系。实验研究将通过限制具有受控特征的两个表面之间的液体来使用表面力设备。静态和流体动力以及动态剪切的测量将在一组具有广泛组成范围的明智选择的离子液体上进行。这些研究的发现将用于开发一个框架，以预测纳米结构的离子液体的流变学。此外，这项研究所产生的知识将使从业者能够通过精确控制其结构，表面润湿性，粗糙度和潜力来调节离子液体的纳米流变理学反应。该奖项反映了NSF的法定任务，并被认为是通过基金会的智力优点和广泛的影响来评估CRETERIA的评估，并被认为是值得的。