Chen Guining, Chen Cailing, Guo Yanan, Chu Zhenyu, Pan Yang, Liu Guozhen, Liu Gongping, Han Yu, Jin Wanqin, Xu Nanping
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China.
King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal, Saudi Arabia.
Science. 2023 Sep 22;381(6664):1350-1356. doi: 10.1126/science.adi1545. Epub 2023 Sep 21.
Mixed-matrix membranes (MMMs) that combine processable polymer with more permeable and selective filler have potential for molecular separation, but it remains difficult to control their interfacial compatibility and achieve ultrathin selective layers during processing, particularly at high filler loading. We present a solid-solvent processing strategy to fabricate an ultrathin MMM (thickness less than 100 nanometers) with filler loading up to 80 volume %. We used polymer as a solid solvent to dissolve metal salts to form an ultrathin precursor layer, which immobilizes the metal salt and regulates its conversion to a metal-organic framework (MOF) and provides adhesion to the MOF in the matrix. The resultant membrane exhibits fast gas-sieving properties, with hydrogen permeance and/or hydrogen-carbon dioxide selectivity one to two orders of magnitude higher than that of state-of-the-art membranes.
混合基质膜（MMMs）将可加工聚合物与渗透性和选择性更高的填料相结合，具有分子分离的潜力，但在加工过程中，尤其是在高填料负载量下，控制其界面相容性并实现超薄选择性层仍然很困难。我们提出了一种固-溶剂加工策略，以制备一种超薄混合基质膜（厚度小于100纳米），填料负载量高达80体积%。我们使用聚合物作为固体溶剂来溶解金属盐，形成超薄前驱体层，该前驱体层固定金属盐并调节其转化为金属有机框架（MOF），并在基质中提供对MOF的附着力。所得膜表现出快速的气体筛分性能，氢气渗透率和/或氢-二氧化碳选择性比现有技术的膜高一个至两个数量级。
