期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 9, 页码 11296-11305出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c22910
关键词
monodispersity; ZIF-8; dopamine modulation; nucleation; mixed-matrix membrane
资金
- National Natural Science Foundation of China [21878062]
- Natural Science Foundation of Heilongjiang Province for Distinguished Young Scholars [JQ2020B001]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2020DX02]
In this study, a method was developed to synthesize monodispersed ZIF-8 nanocrystals with unique dopamine surface decoration layer in situ, which went through a triple-stage crystallization process to form a rhombic dodecahedron structure. The resulting ZIF-8-DA nanocrystals maintained their crystallinity and abundant microporosity, leading to enhanced gas permeability and selectivity in mixed-matrix membranes.
Enhancing the monodispersity and surface properties of nanoporous zeolitic imidazolate frameworks (ZIFs) are crucial for maximizing their performance in advanced nanocomposites for separations. Herein, we developed an in situ method to synthesize monodispersed ZIF-8 nanocrystals with unique dopamine (DA) surface decoration layer (ZIF-8-DA) in an aqueous solution at room temperature. Interestingly, the in situ formation of the monodispersed ZIF-8-DA nanocrystals experiences a triple-stage crystallization process, resulting in a rhombic dodecahedron architecture, which is greatly different from the synthesis of conventional ZIF-8. The crystallinity and abundant microporosity of ZIF-8-DA nanocrystals is well maintained even with the DA surface decoration. Owing to the advanced surface compatibility and pore properties of ZIF-8-DA, ZIF-8-DA/Matrimid mixed-matrix membranes exhibit both higher gas permeability and selectivity than the pristine Matrimid polyimide membrane, which breaks out the traditional trade-off phenomena between permeability and selectivity.
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