二维离子通道薄膜层层自组装构筑两性离子防污表面及其性能研究

二维离子通道薄膜在盐差发电领域具有巨大的应用前景，但是表面污损严重限制其长期应用。生物细胞膜表面通过两性离子基团实现持久防污，同时内部具有良好的离子传输能力。受此启发，本项目拟设计功能化聚电解质进行层层自组装，在二维离子通道薄膜表面限域构筑仿生两性离子表面，通过控制聚电解质的界面扩散及复合效应，在形成防污屏障的同时避免影响离子通道内部的尺寸、电荷分布和离子选择性，从而突破其他表界面修饰方法易于渗入并破坏离子通道的局限性。重点研究组装单元、组装条件、基底类型与组装体表面及界面形态之间的内在联系及其对二维离子通道薄膜离子传输和表面防污的影响规律；搭建并测试以表面修饰后的二维离子通道薄膜为基础的盐差发电器件，探索获得高功率、高转换效率且长效防污的盐差发电器件体系。本项目将发挥超分子自组装体功能设计强、可精确调控的特点，为仿生离子通道材料的表界面功能化设计提供实验思路和理论依据。

Two-dimensional ion channel membranes feature their high-performance of harvesting salinity gradient energy, but suffer from the problem of surface fouling. In this project, we will confine the layer-by-layer assemblies of functional polyelectrolytes on the apparent surface of two-dimensional ion channel membranes to develop a bioinspired zwitterionic surface and try to avoid disturbing the ion transport of two-dimensional channels. The surface and interface of the modified membranes will be characterized, and the influence of assembling units, assembling conditions and substrates on the final structures of polyelectrolyte assemblies will be revealed. The ion transport and surface antifouling of the modified membranes will be investigated in detail, and their key factors will be found out to optimize the modification of the membranes. We will further construct and test a series of devices integrating the modified membranes for harvesting salinity gradient energy. This project will provide a feasible design and practical basis for the surface engineering of ion channel materials and pave the way to cope with surface-related challenges.