Rheological and rheodielectric hole burning spectroscopy for the investigation of supramolecular relaxation processes in small-molecule glass formers

为了深入了解环和链形成氢键缔合物中运动过程的复杂相互作用，本项目旨在通过使其受到大的外部剪切场来破坏合适的粘性液体的超分子结构。也包括傅立叶方法，这需要一个适应和完善的实验协议，以及建立在非共振介电烧孔光谱的框架和可转移到非线性流变学领域。使用机械技术可实现的测量的定量描述将需要调整理论方法，这些方法是已知的，以允许对相应的介电实验进行忠实的建模。这些活动的主要目标是解开的超分子机制，如一元醇，仲酰胺，和水溶液中的德拜型液体。特别是，这涉及到迄今为止，很大程度上未知的相互耦合的电和机械的自由度，在这些流体中的组合实验，如流变介电光谱和红外吸收频率依赖的剪切场的探索。

To gain detailed insights into the complex interplay of motional processes in ring- and chain-forming hydrogen-bonded associates, the present project aims at destabilizing the supramolecular structure of suitable viscous liquids by subjecting them to large external shear fields. Also including Fourier methods, this calls for an adaptation and refinement of experimental protocols that are well established in the framework of nonresonant dielectric hole burning spectroscopy and transferrable to the field of nonlinear rheology. The quantitative description of measurements achievable using the mechanical techniques will require to adjust theoretical approaches that are known to allow for a faithful modeling of corresponding dielectric experiments. The major goal of these activities is to unravel the supramolecular mechanisms active in Debye-type liquids such as monohydroxy alcohols, secondary amides, and aqueous solutions. In particular, this involves the exploration of the so far largely uncharted mutual coupling of electrical and mechanical degrees of freedom in these fluids by means of combination experiments like rheodielectric spectroscopy and infrared absorption in frequency dependent shear fields.