Zhou Zongyao, Guo Dong, Shinde Digambar B, Cao Li, Li Zhen, Li Xiang, Lu Dongwei, Lai Zhiping
Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
ACS Nano. 2021 Jul 27;15(7):11970-11980. doi: 10.1021/acsnano.1c03194. Epub 2021 Jun 29.
Polymer membranes typically possess a broad pore-size distribution that leads to much lower selectivity in ion separation when compared to membranes made of crystalline porous materials; however, they are highly desirable because of their easy processability and low cost. Herein, we demonstrate the fabrication of ion-sieving membranes based on a polycarbazole-type conjugated microporous polymer using an easy to scale-up electropolymerization strategy. The membranes exhibited high uniform sub-nanometer pores and a precisely tunable membrane thickness, yielding a high ion-sieving performance with a sub-1 Å size precision. Both experimental results and molecular simulations suggested that the impressive ion-sieving performance of the CMP membranes originates from their uniform and narrow pore-size distribution.
聚合物膜通常具有较宽的孔径分布，与由结晶多孔材料制成的膜相比，其在离子分离中的选择性要低得多；然而，由于其易于加工且成本低，它们非常受欢迎。在此，我们展示了基于聚咔唑型共轭微孔聚合物，采用易于放大的电聚合策略制备离子筛分膜。这些膜表现出高度均匀的亚纳米级孔径和精确可调的膜厚度，以亚1埃的尺寸精度实现了高离子筛分性能。实验结果和分子模拟均表明，CMP膜令人印象深刻的离子筛分性能源于其均匀且狭窄的孔径分布。
