Precise Sub-Angstrom Ion Separation Using Conjugated Microporous Polymer Membranes

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...

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Published inACS nano Vol. 15; no. 7; pp. 11970 - 11980
Main Authors Zhou, Zongyao, Guo, Dong, Shinde, Digambar B, Cao, Li, Li, Zhen, Li, Xiang, Lu, Dongwei, Lai, Zhiping
Format Journal Article
LanguageEnglish
Published American Chemical Society 27.07.2021
Subjects
electropolymerization
ion sieving
precise separation
membrane
conjugated microporous polymer
carbon nanotube film
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Summary: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.
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ISSN:1936-0851
1936-086X
1936-086X
DOI:10.1021/acsnano.1c03194