Investigations of ionic liquid - solute systems by surface sensitive spectroscopic techniques - part of the initiative "Shaping micro- and macroscopic properties of ionic liquid-solute systems"

通过表面敏感光谱技术研究离子液体-溶质系统 - “塑造离子液体-溶质系统的微观和宏观特性”计划的一部分

• 批准号: 29200579
• 负责人: Professor Dr. Harald Morgner
• 金额: --
• 依托单位: School of Chemistry, Physics and Earth Sciences
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/29200579?language=en
• 关键词: Investigations; ionic; liquid; solute; systems

We propose to investigate experimentally the molecular structure of the surface of ionic liquids with surface sensitive methods. The goals are to determine thermodynamic properties of ionic liquids by determining their surface structure and to validate the results of simulations. We are able to determine directly concentration depth profiles of liquid surfaces with the method neutral impact collision ion scattering spectroscopy (NICISS). The concentration depth profiles yield the surface excess of the different species. Knowing the surface tension and making use of the Gibbs equation the chemical potentials can be determined. The chemical potential is an information in general required for optimizing chemical processes. An important prerequisite for the investigations is the control of the cleanliness of the liquid surfaces. Surface sensitive methods are especially suitable for detecting the presence of surface active impurities. Measuring the surface tension of the investigated substances we will be able to gain data of systems with controlled cleanliness of the surface. Even though our project will be of general benefit for the entire priority program, it will be carried out in close cooperation between 4 groups. The project is an essential contribution for a further understanding of ionic liquid structure-property relationships in its own right, the four research groups will mutually benefit from participating in an interdisciplinary network of chemical engineers, physicists, and chemists. New methods of generating physico-chemical data are validated with existing methodology, and the large set of data obtained from ionic liquids of known purity is shared within the network, thus enabling the partners to dissect the results from a cross-section of science: fundamental and theoretical as well as technological and experimental.

我们建议用表面敏感方法对离子液体表面的分子结构进行实验研究。目标是通过确定离子液体的表面结构来确定离子液体的热力学性质并验证模拟结果。我们能够使用中性碰撞离子散射光谱 (NICISS) 方法直接确定液体表面的浓度深度分布。浓度深度分布产生不同物种的表面过量。知道表面张力并利用吉布斯方程可以确定化学势。化学势是优化化学过程通常所需的信息。研究的一个重要先决条件是控制液体表面的清洁度。表面敏感方法特别适合检测表面活性杂质的存在。通过测量所研究物质的表面张力，我们将能够获得表面清洁度受控的系统的数据。尽管我们的项目将为整个优先计划带来普遍利益，但它将在 4 个小组之间密切合​​作进行。该项目本身对进一步了解离子液体结构-性能关系做出了重要贡献，四个研究小组将通过参与化学工程师、物理学家和化学家的跨学科网络而互惠互利。生成物理化学数据的新方法通过现有方法进行验证，并且从已知纯度的离子液体获得的大量数据在网络内共享，从而使合作伙伴能够从科学的横截面剖析结果：基础理论以及技术和实验。