Bicontinuous microemulsions in confinement - absorption into porous matrices, phase behavior and transport

提出的项目致力于研究无序介孔矩阵中双连续微乳液的结构和几何约束下的动力学。当双连续微乳液穿透介孔结构时，相行为发生变化，从而导致微乳液的物理化学性质发生变化。本课题将研究不同疏水性多孔结构的润湿和渗透对双连续微乳相行为的影响。研究了具有温敏相行为的三元体系微乳以及基于糖表面活性剂的四相体系微乳。本文将阐明微乳在亲疏水孔中的扩散、微乳在这些孔中的润湿行为以及微乳的相行为之间的关系。还将研究几何限制如何影响微乳的临界行为以及是否诱导微相分离。使用小角散射方法，特别是中子小角散射和光学显微镜（特别是单分子定位显微镜）在介孔基质内部的结构解析中起着核心作用。在介孔环境中，微乳液的内部动力学也会发生变化，这将通过中子自旋回波光谱进行研究。这样就可以比较体积相、平面界面和孔隙矩阵内部的动力学。

The proposed project is dedicated to the investigation of bicontinuous microemulsions in disordered mesoporous matrices with respect to their structure and dynamics within the geometric constraints. When a bicontinuous microemulsion penetrates a mesoporous structure, a change in the phase behaviour and thus a change in the physicochemical properties of the microemulsions is expected. In this project the influence of wetting and penetration of porous structures of different hydrophobicity on the phase behaviour of bicontinuous microemulsions will be studied. Microemulsions of ternary phase systems with a temperature sensitive phase behaviour as well as microemulsions of quaternary phase systems based on sugar surfactants will be investigated. The relationship between the propagation in hydrophilic and hydrophobic pores, the wetting behaviour of the bicontinuous microemulsions within these pores and the phase behaviour that develops will be clarified. It will also be investigated how the geometric restriction affects the critical behaviour of the microemulsions and whether microphase separation is induced. The use of small angle scattering methods, especially neutron small angle scattering and optical microscopy (especially single molecule localization microscopy) plays a central role in the structural elucidation within the mesoporous matrices. Within the mesoporous environment a change in the inner dynamics in the microemulsions is also expected, which will be investigated by using neutron spin echo spectroscopy. This will allow a comparison of the dynamics in the volume phase, at planar interfaces and inside pore matrices.