Tailoring Flexibility of Nanofluidic Covalent Organic Framework Membranes for Efficient Separation of Gases with Similar Kinetic Diameters

W4414196449 · 수집 2026-10-04 18:16:39

T10409 Fuel Cells and Related Materials

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Conventional nanofluidic membranes often exhibit low selectivities for efficient separation of gases with similar kinetic diameters. Soft nanofluidic membranes overcome this challenge through a combination of selective binding sites and tunable pore structures, creating an on-demand separation switch that enables adaptive pore opening for enhanced gas separation. Herein, three different nanofluidic membranes of soft covalent organic frameworks (named S-COF1, S-COF2, and S-COF3) with varied flexibility levels were synthesized for similar-sized gas separation using ethane (C2H6) and ethylene (C2H4) as model gases. The flexibility was precisely tuned by introducing varying numbers of functionalized -OH linkers to form intramolecular [-O-H⋯N[double bond, length as m-dash]C] hydrogen bonding. Highly flexible S-COF1 and S-COF2 demonstrated similar pore behavior for C2H4 and C2H6, resulting in poor separation efficiency. In contrast, S-COF3, with enhanced rigidity due to the addition of the highest amount of -OH linkers, exhibited distinct pore switching from "close" in C2H4 to "open" in C2H6. This led to a C2H6/C2H4 selectivity of 18.2, which is superior to that of most of the reported membranes. This work establishes a functionalized -OH linker strategy to precisely tune COF flexibility, revealing its critical role in gas separation and advancing the design of dynamic porous membranes.

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