Structure and dynamics of ionic liquid crystals

离子液晶的结构和动力学

• 批准号: 257901426
• 负责人: Professor Dr. Frank Gießelmann
• 金额: --
• 依托单位: Lehrstuhl für Supramolekulare Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/257901426?language=en
• 关键词: Structure; dynamics; ionic; liquid; crystals

Ionic Liquid Crystals (ILCs) combine the extraordinary properties of ionic liquids with the anisotropy of conventional thermotropic liquid crystals. Being long-range ordered liquid electrolytes, they represent an extremely promising new class of materials. Like already in the first project phase, the general goal of our project is to provide a sound basis for the molecular understanding of ionic LCs, their structures and dynamics, and to identify and evaluate application-relevant aspects of ionic LCs on this basis. In terms of the molecular understanding of ionic LCs, the first project phase provided interesting new aspects that will be pursued in the second funding period. Specifically, these are (i) the existence of surprisingly strong pre-transition effects in the isotropic phase of ionic LCs, (ii) the relevance of ion-specific effects, which may be systematized by the Hofmeister series, and (iii) the relationship between ILCs and lyotropic liquid crystals. Using new series of ILCs to be synthesized, in which monovalent anions and cations of the respective Hofmeister series are systematically varied, the investigations of the second funding phase should clarify to what extent the properties and phase behaviour of ionic LCs can be systematized and understood by more general concepts from the fields of lyotropic liquid crystals (packing parameters), interionic interactions (Hofmeister series) or pre-transition phenomena. In addition to the molecular understanding of ionic LCs, application-relevant aspects of ionic LCs will receive increased attention in the second funding phase. The investigations planned for this purpose are primarily aimed at electrochemical applications of ILCs, in particular the transport properties of H+ and Li+ ions in thermotropic and possibly lyotropic ILC phases as well as the anisotropy of ionic charge transport in ILCs. The results of these investigations should allow a first evaluation of potential applications of ILCs as thermally and electrochemically stable electrolytes in batteries and (medium temperature) fuel cells.

离子液晶（ILC）联合收割机结合了离子液体的特殊性质和传统热致液晶的各向异性。作为长程有序的液体电解质，它们代表了一类非常有前途的新材料。与第一个项目阶段一样，我们项目的总体目标是为离子LC的分子理解，其结构和动力学提供良好的基础，并在此基础上识别和评估离子LC的应用相关方面。在离子LC的分子理解方面，第一个项目阶段提供了有趣的新方面，将在第二个资助期继续进行。具体而言，这些是（i）在离子LC的各向同性相中存在令人惊讶的强预转变效应，（ii）离子特异性效应的相关性，这可以通过Hofmeister系列系统化，以及（iii）ILC和溶致液晶之间的关系。使用待合成的新系列的ILC，其中相应Hofmeister系列的单价阴离子和阳离子系统地变化，第二资助阶段的研究应澄清离子型LC的性质和相行为在多大程度上可以通过来自溶致液晶领域的更一般概念系统化和理解（填充参数）、电子相互作用（Hofmeister系列）或预转变现象。除了对离子型液晶的分子理解外，离子型液晶的应用相关方面将在第二个资助阶段得到更多的关注。为此目的计划的调查主要针对ILC的电化学应用，特别是H+和Li+离子在热致和可能溶致ILC相中的传输特性以及ILC中离子电荷传输的各向异性。这些调查的结果应允许的ILC作为电池和（中温）燃料电池的热和电化学稳定的电解质的潜在应用的第一次评估。