Rheological properties of vesicles and microcapsules: Flow-induced rotations, oscillations, tumbling motions, deformations, orientations, membrane folding processes and rupture.

在新计划的研究项目中，我们使用微囊和囊泡作为简单的模型系统，深入研究生物细胞在简单剪切流中的流变行为。由于明确的结构和广泛的化学变化可能性，有可能合成柔软的、量身定做的模型粒子。不同实验技术的组合允许对胶囊或囊泡的流动特性进行全面表征。我们感兴趣的主要焦点在于，首先，分析了非线性流变膜的性质。为了观察流动诱导现象，我们计划建造一个改进的流动池(流变仪)，它也可以进行温度相关的测量。在这个装置中，我们可以观察变形、取向、振荡、翻滚运动、膜旋转、破裂机制和膜折叠过程。这些测量数据不仅可以用来评价现有的理论模型，还可以用来理解软颗粒复杂的流动诱导现象。

In the newly planned research project we use microcapsules and vesicles as simple model systems for advanced investigations of the rheological behavior of biological cells in simple shear flow. Caused by the defined construction and the wide palette of chemical variation possibilities it is possible to synthesize soft, tailor-made model particles. The combination of different experimental techniques allows a comprehensive characterization of the flow properties of the capsules or vesicles. The main focus of our interest lies, first of all, in the analysis of the non-linear rheological membrane properties. In order to observe flow-induced phenomena we plan the construction of an improved flow cell (rheoscope) which also permits temperature dependent measurements. In this apparatus we can then observe deformations, orientations, oscillations, tumbling movements, membrane rotations, breaking mechanisms and membrane folding processes. The measured data serve to evaluate recent theoretical models, and they can also be used to understand complicated flow-induced phenomena of soft particles.