Dynamics of Electron Hopping and Translational Diffusion in Monolayers at the Air/Water Interface

在空气/水界面使用单分子层组件对生物膜等有组织的分子系统进行建模，形成了由分析和表面化学计划支持的这项研究项目的主题。有序多分子结构中的电子跃迁和分子在水面上的横向平移扩散是本工作研究的两个主要课题。朗缪尔-布洛杰特技术、布鲁斯特角度显微镜和涉及“线”微电极的二维电化学是这些研究中使用的主要实验工具。将确定电子跳跃速率与这些有序单分子膜中施主-受主对取向的依赖关系。此外，还研究了界面层的流体动力耦合和粘度对表面活性剂分子在水面扩散的影响。这些信息将有助于加深对分子和电子通过生物重要的膜系统的传输的理解。在空气/水界面形成的分子单层组装是本项目研究的重点。我们将使用各种光学和电化学方法来探索电子和表面活性剂分子在这些模型体系中的横向运动。这些信息将有助于开发在生物和电分析系统中具有重要意义的膜传输模型。

The modelling of organized molecular systems such as biological membranes, using monolayer assemblies at the air/water interface, forms the subject of this research project supported by the Analytical and Surface Chemistry program. Electron hopping in organized multimolecular structures, and lateral translational diffusion of molecules on the water surface are the two main topics of investigation in this work. Langmuir-Blodgett techniques, Brewster angle microscopy, and 2D electrochemistry involving "line" microelectrodes are the principal experimental tools used in these studies. The dependence of electron hopping rate on orientation of the donor- acceptor pair in these organized monolayers will be determined. The effects of hydrodynamic coupling and viscosity of the interfacial layer on the diffusion of surfactant molecules on the water surface will be investigated as well. This information will help to develop an understanding of molecular and electron transport through biologically important membrane systems. Molecular monolayer assemblies formed at the air/water interface are the focus of the research of this project. The lateral motion of electrons and surfactant molecules in these model systems will be explored using a variety of optical and electrochemical methods. This information will be useful for developing models of membrane transport of importance in biological and electroanalytical systems.