FOR 1583: Hydrogen-Bonded Liquids Subject to Interfaces of Various Hydroaffinities

氢键液体表现出许多非凡的性质，使它们在基础和面向应用的研究中非常有趣。众所周知的例子是水的反常现象，特别是密度反常现象，这是生命所必需的。界面对液体的性质影响很大。例如，水在纳米范围内的流动性取决于环境的亲水性和大小。在受限空间中控制氢键液体行为的能力对于生物过程的调节和纳米技术的微型化发挥着巨大的作用。研究股结合了现代制备、表征和建模技术，以分析氢键液体在不同大小、亲水性和柔软性的限制条件下以及在各种外部条件下，例如在较宽的温度范围内的结构、动力学和相行为的相互作用。一般而言，由于界面的影响和有限尺寸的影响，限制层中的液体和整体中的液体的性质可能不同。前者是由边界面上的特定相互作用引起的，而后者是在约束的大小与系统的结构和动力学长度尺度相当时发生的。为了确定这些效应的相关性并获得基本的了解，我们在研究单元中制备了具有功能化表面的介孔主体材料。此外，还结合大量的实验和理论方法对客体材料的行为进行了分析。具体地说，我们使用了散射、光谱、量热和显微镜的方法以及模拟和建模的方法。通过这种方式，我们在各种长度和时间尺度上研究结构和动力学，以便一方面在微观水平上获得对结构-动力学关系的基本见解，另一方面将宏观性质追溯到分子机制。

Hydrogen-bonded liquids exhibit a number of extraordinary properties, rendering them very interesting for basic- and application-oriented research. Well known examples are the anomalies of water, in particular, the density anomaly, which is essential for life. Interfaces strongly affect the properties of liquids. For example, the fluidity of water in nanoscopic confinements depends on the hydroaffinity and size of the environment. The ability to control the behaviour of hydrogen-bonded liquids in restricted spaces plays an enormous role for the regulation of biological processes and for the miniaturisation in nanotechnology. The Research Unit combines modern techniques of preparation, characterisation and modelling to analyse the interplay of structure, dynamics and phase behaviour of hydrogen-bonded liquids in confinements of different size, hydroaffinity and softness and for various external conditions, e.g., in a broad temperature range. In general, the properties of a liquid in a confinement and in the bulk can differ because of the effects of interfaces and of finite size. The former result from specific interactions at the boundary surface, while the latter occur when the size of the confinement is comparable to structural and dynamical length scales of the system. To ascertain the relevance of these effects and to gain a fundamental understanding, we prepare mesoporous host materials with functionalised surfaces in the Research Unit. Moreover, a large number of experimental and theoretical methods are combined to analyse the behaviours of the guest materials. Specifically, we use methods of scattering, spectroscopy, calorimetry and microscopy as well as approaches of simulation and modelling. In this way, we investigate structure and dynamics on a large variety of length- and time scales so as to, on the one hand, obtain fundamental insights into structure-dynamics relations on a microscopic level and, on the other hand, trace back macroscopic properties to molecular mechanisms.