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Here, we synthesized a series of novel metal organic cages (MOCs) with aperture pore size precisely positioned between CO\n            <jats:sub>2<\/jats:sub>\n            and N\n            <jats:sub>2<\/jats:sub>\n            or CH\n            <jats:sub>4<\/jats:sub>\n            . These MOCs were uniformly dispersed in the polymers of intrinsic microporosity (PIM-1). Among them, the MOC-Ph cage effectively modulated chain packing and optimized the microporous structure of the membrane. Remarkably, the PIM-Ph-5% membrane shows superior performance, achieving an excellent CO\n            <jats:sub>2<\/jats:sub>\n            permeability of 8803.4 barrer and CO\n            <jats:sub>2<\/jats:sub>\n            \/N\n            <jats:sub>2<\/jats:sub>\n            selectivity of 59.9, far exceeding the 2019 upper bound. This approach opens opportunities for improving the porous structure of polymeric membranes for CO\n            <jats:sub>2<\/jats:sub>\n            capture and other separation applications.\n          <\/jats:p>","DOI":"10.1126\/sciadv.ads0583","type":"journal-article","created":{"date-parts":[[2025,1,22]],"date-time":"2025-01-22T18:58:39Z","timestamp":1737572319000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":51,"title":["Metal-organic cages improving microporosity in polymeric membrane for superior CO\n            <sub>2<\/sub>\n            capture"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5069-240X","authenticated-orcid":true,"given":"Jian","family":"Guan","sequence":"first","affiliation":[{"name":"CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, 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