CAREER: Mesoscale Aggregation and Interfacial Dynamics in Ionic Liquids

职业：离子液体中的介观聚集和界面动力学

基本信息

批准号：
1753282
负责人：
Joshua Sangoro
金额：
$ 62.5万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-15 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1753282&HistoricalAwards=false
关键词：
CAREER Mesoscale Aggregation Interfacial Dynamics

项目摘要

In this project funded by the Chemical Structure Dynamics and Mechanism (CSDM-A) program of the Chemistry Division, Professor Joshua Sangoro of The University of Tennessee, Knoxville is using advanced experimental techniques to study the structure of ionic liquids, which are liquids composed of positive and negative ions. Unlike ionic solids (such as table salt, Na+ Cl-), the fluid form of ionic liquids (also called molten salts) makes them potentially useful for a variety of technological applications, such as batteries, fuel cells and the solvents for the synthesis of other molecules. Just as liquid water actually contains areas that are ice-like in their ordering, ionic liquids can also possess local ordering of ionic molecules. The extent of ordering in ionic liquids influences their physical properties (e.g., density, viscosity, ability to conduct electricity). Professor Sangoro and his team seek to understand how ions organize in the liquid state, how long the arrangements persists, and how these arrangements are changed by interfaces such as the ionic liquid-air interface, or the interface between the liquid and a metal surface(where the metal may be a catalyst or an electrode for chemical reactions). The Sangoro group uses x-ray and neutron scattering techniques and a technique called broadband dielectric spectroscopy to obtain information about the structure and behavior of ionic liquids. This information may aid in the development of new clean energy and battery technologies. The main goal of the educational and outreach plans is to increase student interest in, exposure to, and preparation for careers in science and engineering, with specific focus on minority students. Professor Sangoro organizes mentored research experiences for high school students from underrepresented/minority and economically disadvantaged local groups, by first introducing engineering undergraduate students to research within the first two years of college. The research group partners with established NSF-funded outreach programs at the University of Tennessee to attract and retain engineering students from underrepresented groups, providing new research and training opportunities to graduate, undergraduate, and high school students in order to provide state-of-the-art research opportunities. Professor Sangoro engages in individualized mentoring for selected K-12 students from underrepresented groups in the economically disadvantaged groups living in the East Knoxville area. This CAREER grant enables the research team to provide hands-on training to both graduate and undergraduate students as well as high school students who may go on to become future scientists and engineers.The project focuses on understanding the impact of mesoscale organization on interfacial ion dynamics in bulk and confined molecular ionic liquids. Upon systematic variation of the chemical composition of ionic liquids, the mesoscale organization and dynamics are probed by x-ray and neutron scattering, dynamic mechanical spectroscopy, and broadband dielectric spectroscopy. These complementary techniques enable the correlation of mesoscale structures, and an understanding of their dynamics and the resulting physical and chemical properties of ionic liquids. The second emphasis of this research project is on elucidating the correlation between of mesoscale organization and dynamics within the electrochemical double layers in molecular ionic liquids. This effort involves development of a new theoretical model to describe the processes associated with accumulation of ions at interfaces between ions and solid electron conductors. The third thrust of the project focuses on experiments to understand the impact of geometric confinement on mesoscale organization and dynamics. To achieve this, silica nanopores with mean diameters as small as 4 nanometers are prepared through electrochemical etching and filled with systematic series of ionic liquids. The interactions between ionic liquids and the pore walls are intentionally varied while measuring the dynamics associated with the ions. The series of experiments and computations leads to a molecular-level understanding of the influence of mesoscopic organization on interfacial ion dynamics and transport in bulk and confined molecular ionic liquids. The fundamental understanding gained from these studies enables rational development of more efficient systems of ionic liquids for different applications including uses in electrochemical power sources and devices. The broader impacts of this work include potential societal benefits from an increased understanding of ionic liquids, as well as training of students and postdoctoral associates in fundamental science underlying many electrochemical energy technologies.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.

在田纳西大学的Joshua Sangoro教授的化学结构动力学和机制（CSDM-A）计划资助的该项目中，诺克斯维尔正在使用先进的实验技术来研究由阳性和负离子组成的离子液体的结构。与离子固体（例如含盐，Na+ Cl-）不同，离子液体的流体形式（也称为熔融盐）使它们可能对各种技术应用有用，例如电池，燃料电池和溶剂来合成其他分子。正如液态水实际上包含冰上的区域一样，离子液体也可以拥有局部的离子分子订购。离子液体中有序的程度会影响其物理特性（例如，密度，粘度，传导电力的能力）。 Sangoro教授和他的团队试图了解离子如何在液态状态下组织，排列的持续时间以及如何通过诸如离子液体空气界面（例如液体和金属表面之间的界面）（金属可能是催化剂或化学反应的电极的催化剂或电极）之间的接口来改变这些布置）。 Sangoro组使用X射线和中子散射技术以及一种称为宽带介电光谱的技术来获取有关离子液体结构和行为的信息。此信息可能有助于开发新的清洁能源和电池技术。教育和外展计划的主要目标是增加学生对科学和工程职业的兴趣，接触和准备，并特别关注少数族裔学生。 Sangoro教授通过首先介绍工程学本科生在大学的前两年内首先介绍工程学专业的本科生，从而为来自代表性不足/少数群体和经济弱势本地团体的高中生提供了指导的研究经验。研究小组与田纳西大学建立的NSF资助的外展计划合作，吸引和保留来自代表性不足的小组的工程学生，为毕业，本科和高中生提供新的研究和培训机会，以提供最先进的研究机会。 Sangoro教授为来自东诺克斯维尔地区的经济弱势群体中代表性不足的团体的精选K-12学生提供个性化指导。这项职业授予使研究团队能够为研究生和本科生以及可能继续成为未来科学家和工程师的高中生提供动手培训。该项目致力于了解中尺度组织对散装界面离子动态的影响，并限制了分子离子离子液体。在离子液体化学成分的系统变化后，通过X射线和中子散射，动态机械光谱和宽带介电光谱探测中尺度组织和动力学。这些互补技术可以使中尺度结构的相关性及其动力学以及离子液体的物理和化学特性的理解。该研究项目的第二个重点是阐明分子离子液体中电化学双层内中尺度组织与动态之间的相关性。这项工作涉及开发一种新的理论模型，以描述与离子与固体电子导体之间接口的积累相关的过程。该项目的第三个力量集中在实验上，以了解几何限制对中尺度组织和动态的影响。为此，通过电化学蚀刻来制备具有平均直径为小至4纳米的硅纳米孔，并充满了系统系列的离子液体。在测量与离子相关的动力学时，离子液体与孔隙壁之间的相互作用是有意的。一系列实验和计算导致了对介质组织对界面离子动力学的影响以及散装和限制分子离子离子液体传输的影响的分子级别的理解。从这些研究中获得的基本理解使离子液体的更有效系统用于不同应用，包括电化学能源和设备的用途。这项工作的更广泛的影响包括对离子液体的了解的潜在社会利益，以及对许多电化学能源技术的基础科学领域的学生和博士后协会的培训。这项奖项反映了NSF的法定任务，并认为通过基金会的知识优点和广泛的crietia crietia crietia criperia criperia criperia cribitia criperia criperia criperia criperia recteria rectuniation均值得通过评估。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Ion dynamics in pendant and backbone polymerized ionic liquids: A view from high-pressure dielectric experiments and free-volume model

DOI：
10.1103/physreve.105.054502
发表时间：
2022-05-09
期刊：
PHYSICAL REVIEW E
影响因子：
2.4
作者：
Cheng, Shinian;Wojnarowska, Zaneta;Paluch, Marian
通讯作者：
Paluch, Marian

Localized and Collective Dynamics in Liquid-like Polyethylenimine-Based Nanoparticle Organic Hybrid Materials

DOI：
10.1021/acs.macromol.0c02370
发表时间：
2021-02
期刊：
Macromolecules
影响因子：
5.5
作者：
E. Mapesa;N. Cantillo;Sara T. Hamilton;Matthew A Harris;T. Zawodzinski;Ah-Hyung Alissa Park;J. Sangoro-J.-S
通讯作者：
E. Mapesa;N. Cantillo;Sara T. Hamilton;Matthew A Harris;T. Zawodzinski;Ah-Hyung Alissa Park;J. Sangoro-J.-S

Natural deep eutectic solvents for lignocellulosic biomass pretreatment: Recent developments, challenges and novel opportunities