Investigation of the mechanism of orientation in lyotropic liquid crystalline phases

溶致液晶相取向机制的研究

• 批准号: 270172684
• 负责人: Professorin Dr. Christina Marie Thiele
• 金额: --
• 依托单位: Arbeitskreis Thiele
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/270172684?language=en
• 关键词: Investigation; mechanism; orientation; lyotropic; liquid

If solutes are placed in an anisotropic environment - as in this case a liquid crystal or polymer gel ¿ they are oriented with respect to the magnetic field. This makes anisotropic nmr parameters, such as the dipolar coupling, directly observable. The liquid crystal can thus be understood as a special and complex kind of confinement. To describe the orientation of compounds in orienting media models are used, which frequently only contain steric or electrostatic potentials without taking the structure of the anisotropic medium in atomic detail into account. Hydrogen bonds (H-bonds) also have not been taken into account so far. The aim of this project is to obtain information on the interaction of dissolved compounds in liquid crystalline media. Thus we want to investigate liquid crystals with different degrees of intramolecular stabilization via H-bonds. The emphasis shall we laid on the importance of H-bonds for stability and aggregation behavior of the liquid crystal as well as on their influence on the orientational properties of the dissolved compound. Thus solutes shall be used which can either form H-bonds or cannot form H-bonds. Thus we aim at a better understanding on the importance of H-bonds in the orientational process in order to obtain better models for liquid crystal solute interactinos.

如果溶质被放置在一个各向异性的环境中——就像在这种情况下的液晶或聚合物凝胶——它们就磁场而言是定向的。这使得各向异性核磁共振参数，如偶极耦合，直接可见。因此，液晶可以被理解为一种特殊而复杂的约束。为了描述取向介质中化合物的取向，通常使用定向介质模型，这些模型只包含空间或静电势，而不考虑各向异性介质的原子细节结构。到目前为止，氢键（h键）也没有被考虑在内。本项目的目的是获得液晶介质中溶解化合物相互作用的信息。因此，我们想通过氢键来研究具有不同程度分子内稳定的液晶。重点是氢键对液晶的稳定性和聚集行为的重要性，以及它们对溶解化合物的取向性质的影响。因此溶质应使用可以形成氢键或者不能形成氢键。因此，我们的目标是更好地理解氢键在取向过程中的重要性，以便获得更好的液晶溶质相互作用模型。