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

• 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

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增进对离子液体结构-性能关系的了解，离子液体是具有可调成分的有机熔盐。除了高离子电导率外，离子液体还具有低挥发性、良好的热稳定性、低可燃性和宽的电化学窗口。这些特性可以使安全的储能设备具有比现有技术更高的能量和功率密度以及更长期的稳定性。然而，这些器件的性能取决于极窄空间中离子液体的粘度，而它们的高粘度与电导率和电容降低、多孔电极润湿性差以及功率密度较低有关。因此，解决纳米离子液体流动特性的研究至关重要。该项目将研究纳米级通道中液体成分与流动行为之间的关系。因此，它将能够建立离子液体作为下一代超级电容器和电池技术电解质的设计原理。拟议的研究还将通过在材料化学与工程、界面科学和流变学的交叉领域培训两名​​研究生研究助理，为美国劳动力的发展做出贡献。这种多学科方法将有助于扩大代表性不足群体对研究的参与，并使工程教育受益。该研究项目将解决纳米离子液体流动中的三个主要问题：液体结构与纳米流变学之间的关系、表面成分（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。该实验研究将使用表面力装置，通过将液体限制在具有受控特性的两个表面之间。静态力和水动力以及动态剪切力的测量将在一组精心选择的具有多种成分的离子液体上进行。这些研究的结果将用于开发一个框架来预测纳米离子液体的流变学。此外，这项研究产生的知识将使从业者能够通过精确控制离子液体的结构、表面润湿性、粗糙度和电位来调节离子液体的纳米流变响应。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Effects of Layering and Supporting Substrate on Liquid Slip at the Single-Layer Graphene Interface

分层和支撑基底对单层石墨烯界面液体滑移的影响

• DOI: 10.1021/acsnano.1c01884
• 发表时间: 2021-06
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Greenwood, Gus;Kim, Jin Myung;Zheng, Qianlu;Nahid, Shahriar Muhammad;Nam, SungWoo;Espinosa
• 通讯作者: Espinosa

Effects of Nanoscale Roughness on the Lubricious Behavior of an Ionic Liquid

纳米级粗糙度对离子液体润滑行为的影响

• DOI: 10.1002/admi.202000314
• 发表时间: 2020-06-24
• 期刊: Advanced Materials Interfaces
• 影响因子: 5.4
• 作者: P. Nalam;Alexis Sheehan;Mengwei Han;R. Espinosa‐Marzal
• 通讯作者: R. Espinosa‐Marzal

Water in the Electrical Double Layer of Ionic Liquids on Graphene

石墨烯上离子液体双电层中的水

• DOI: 10.1021/acsnano.3c01043
• 发表时间: 2023-05-23
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Zheng, Qianlu;Goodwin, Zachary A. H.;Gopalakrishnan, Varun;Hoane, Alexis G.;Han, Mengwei;Zhang, Ruixian;Hawthorne, Nathaniel;Batteas, James D.;Gewirth, Andrew A.;Espinosa-Marzal, Rosa M.
• 通讯作者: Espinosa-Marzal, Rosa M.

Rheological Characteristics of Ionic Liquids under Nanoconfinement

纳米约束下离子液体的流变特性

• DOI: 10.1021/acs.langmuir.1c03460
• 发表时间: 2022-03
• 期刊: Langmuir
• 影响因子: 3.9
• 作者: Han, Mengwei;Rogers, Simon A.;Espinosa
• 通讯作者: Espinosa

Influence of Water on Structure, Dynamics, and Electrostatics of Hydrophilic and Hydrophobic Ionic Liquids in Charged and Hydrophilic Confinement between Mica Surfaces

水对云母表面带电和亲水约束中亲水和疏水离子液体的结构、动力学和静电的影响

• DOI: 10.1021/acsami.9b10923
• 发表时间: 2019-08
• 期刊: ACS Applied Materials & Interfaces
• 影响因子: 9.5
• 作者: Han, Mengwei;Espinosa
• 通讯作者: Espinosa