RUI: Studies of Strongly Interacting Self-Assembled Systems

本研究致力于强相互作用自组装体系的实验研究。将使用静态和动态光散射技术，在大气压和高压下，研究半稀和浓缩体表面活性剂溶液的物理性质。我们打算研究各种各样的体系，包括两性离子表面活性剂溶液、混合表面活性剂溶液以及包含棒状或管状胶束的溶液。我们将通过光学和直接物理测量来研究管状聚集体在表面或各向同性流体上的二维相行为。对由振动台上的小颗粒组成的模型系统的研究将补充这些测量。总体而言，该计划将提供基本的热力学信息，并改进对大块半稀和浓缩胶束溶液的微观理解，以及用于理解二维相变的新见解和模型系统。这项研究的目的是：1)利用光学和物理化学技术更好地了解半稀和浓缩自组装体系的性质；2)研究自组装聚集体形成三维溶液时以及当它们限制在各向同性流体表面从而形成二维向列相时这些溶液的性质。总体而言，该计划将提供基本的热力学信息，并改进对大块半稀和浓缩胶束溶液的微观理解，以及用于理解二维相变的新见解和模型系统。

Fisch This research focusses on experimental investigations of strongly interacting self-assembled systems. Static and dynamic light scattering techniques will be used, at atmospheric pressure and at high pressures, to study the physical properties of semidilute and concentrated bulk surfactant solutions. We intend to investigate a wide variety of systems including zwitterionic surfactant solutions, mixed surfactant solutions and solutions that contain either rod-like or tubular micelles. The two dimensional phase behavior of tubular aggregates on the surface or an isotropic fluid will be studied both optically and through direct physical measurements. Studies of model systems that consist of small particles on a vibrating table will complement these measurements. Overall, this program will provide essential thermodynamic information and an improved microscopic understanding of bulk semidilute and concentrated micellar solutions and new insights and model systems for understanding phase transitions in two dimensions. %%% The objectives of this research are: 1) to obtain a better understanding of the properties of semidilute and concentrated self-assembled systems by using optical and physical chemical techniques; 2) to study the properties of these solutions when the self-assembled aggregates form a 3-d solution and when they are confined to the surface of an isotropic fluid, thus forming a 2-d nematic phase. Overall, this program will provide essential thermodynamic information and an improved microscopic understanding of bulk semidilute and concentrated micellar solutions and new insights and model systems for understanding phase transitions in two dimensions.