Authors
Xiansong Shi, Haipei Shao, Xin Zhang, Fen Huang, Qixing Liu, He Li, Wei Zhao, Junyu Ren, Yunchuan Pu, Wen-Hua Li, Nengxiu Zhu, Ming Lin, Dan Zhao
Published in
Science advances. Volume 12. Issue 40. Pages eaee9683. Oct 02, 2026. Epub Oct 02, 2026.
Abstract
Covalent organic frameworks (COFs) unlock opportunities to unite rapid mass transport with molecular-level sieving through membranes. However, achieving long-range crystallographic order within these membranes remains a central challenge that limits their separation precision. Here, we report a monomer-driven strategy for the ambient-condition fabrication of COF polycrystalline membranes featuring definite lattice order and polyhedral textures, reminiscent of benchmark metal-organic framework counterparts. Using a rigid, π-conjugated pyrene-centered tetraamine, we enable nonepitaxial intergrowth of faceted COF crystals on a porous support, yielding a 350-nanometer-thick membrane with a record-high Brunauer-Emmett-Teller surface area of 2121 square meters per gram among COF separation membranes of comparable pore size. The resulting COF membrane preserves its crystallographic order and polyhedral texture even after 1 month of solvent exposure while uniquely combining increased surface stiffness with high tensile ductility. Notably, we demonstrate its superior liquid-phase molecular selectivity, outperforming COF analogs with considerably smaller pore apertures, and elucidate an unambiguous correlation between crystallographic order and permselectivity. This work positions crystallographic ordering as a guiding principle for COF membranes, opening more possibilities at the intersection of framework materials and separation technologies.
PMID:
42826176
Bibliographic data and abstract were imported from PubMed on 03 Oct 2026.
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