Microscopy, diffraction and spectroscopy of surfactant monolayer films

这个的目标 表面活性剂膜的研究方向是：（1）研究分子水平的结构-功能 一种新型阴离子Gemini单分子膜中的相互关系 表面活性剂;（2）研究多荧光体中电子能量转移动力学 使用单分子荧光光谱法的光聚合物膜;以及 (3)开发用于分子水平表征的尖端光谱工具 在空气-水界面的单层。 该计划将产生基本的 知识，将告知我们小组的研究，包括工作的应用方面 作物保护和食用油封装，以及提供高品质的 在对加拿大具有重要经济意义的领域培训HQP。 在整个项目期间， 我们将研究：（1）单分子膜的基本结构-功能关系 由新发现的一类阴离子双子表面活性剂组成的膜。 感兴趣的关键问题是表面活性剂的分子结构如何影响基本的单分子层性质，包括侧向堆积 密度、离子结合能力、机械稳定性和剪切流变性。 研究将涉及热力学， 基于显微镜和衍射的单分子膜结构表征 通过化学合成来制备所需的定制表面活性剂。(2)分子水平 在耦合的、发光的、 薄膜中的分子。 的系统 令人感兴趣是由可聚合的聚二乙炔制备的荧光聚二乙炔膜 表面活性剂 我们将测量能量 这些膜中的转移效率和各个膜的相关对准 荧光团在光聚合物与能量转移动力学。测量 将使用单分子荧光各向异性成像与传统的荧光成像相结合， 量子化学计算支持的测量。 (3)新 用于测量薄膜分子水平结构的光谱工具 空气-水界面，包括偏振调制红外反射吸收 光谱和和频产生振动光谱。 前者将利用独特的， 高强度同步辐射，以实现前所未有的时间分辨率， 后者将建立在我们的专业知识与皮科和飞秒激光仪器。 该计划将推动基础研究 在材料科学，通知应用表面活性剂的研究，并提供 在国家重要领域对HQP进行世界一流的培训。

The goals of this research program in surfactant films are: (1) to investigate molecular-level structure-function relationships in monolayer films comprised of a new type of anionic gemini surfactant; (2) to investigate electronic energy transfer dynamics in multifluorophoric photopolymer films using single-molecule fluorescence spectroscopy; and (3) to develop cutting-edge spectroscopy tools for molecular-level characterization of monolayers at the air-water interface. The program will generate fundamental knowledge that will inform applied aspects of our group's research, including work on crop protection and edible oil encapsulation, as well as provide high-caliber training of HQP in areas of economic importance to Canada. Over the program's duration, we will investigate: (1) Fundamental structure-function relationships in monolayer films comprised of a newly-discovered class of anionic gemini surfactants. The key issue of interest is how the molecular structure of surfactants affects fundamental monolayer properties including lateral packing density, ion-binding capacity, mechanical stability and shear rheology. Studies will involve thermodynamic, microscopic and diffraction-based structural characterization of monolayers supported by chemical synthesis to prepare custom surfactants as required. (2) Molecular-level factors that regulate electronic energy transfer efficiency in coupled, luminescent molecules in thin films. The systems of interest are fluorescent polydiacetylene films prepared from polymerizable surfactants. We will measure energy transfer efficiency in these films and correlate alignment of individual fluorophores in the photopolymers with energy transfer dynamics. Measurements will use single-molecule fluorescence anisotropy imaging in combination with traditional fluorescence measurements supported by quantum chemical calculations. (3) New spectroscopic tools for measuring molecular-level structure of films at the air-water interface, including polarization modulated infrared reflection absorption spectroscopy and sum frequency generation vibrational spectroscopy. The former will make use of unique, high-intensity synchrotron radiation to enable unprecedented temporal resolution, and the latter will build on our expertise with pico- and femtosecond laser instrumentation. This program will advance fundamental research in materials science, inform applied surfactant research and provide world-class training of HQP in areas of national importance.