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However, assembling these cages into a continuous POC nanofilm with well\u2010defined pore architecture remains a challenge. Here we propose a hydrogel\u2010induced interfacial shielding strategy to fabricate continuous cage membranes via interfacial polymerization between (1\n                    <jats:italic>R<\/jats:italic>\n                    ,2\n                    <jats:italic>R<\/jats:italic>\n                    )\u20101,2\u2010cyclohexanediamine (CHDA) and 1,3,5\u2010triformylphloroglucinol (Tp). Kevlar hydrogel capable of storing high\u2010concentration CHDA is utilized for rapid formation of an initial film barrier, preventing the diffusion of hydrophilic Tp\u2010based intermediates into the aqueous phase. This shielding effect enables the confinement of Tp\u2010based compounds within the organic phase and thereby intensifies molecular cage assembly at the hydrogel\u2010organic interface. Manipulation of high\u2010concentration diamine leads to accelerated formation of continuous nanofilms, which intensifies the shielding effect and thus yields crystalline cage films and POC nanoparticles in the organic phase. The resultant cage membranes exhibit an impressive water permeability of 22.8 L m\n                    <jats:sup>\u22122<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    bar\n                    <jats:sup>\u22121<\/jats:sup>\n                    and high cation removal efficacy. Further insights from molecular dynamics simulations reveal that the ordered assembly of POC molecules within the membrane is critical to enable the rapid and selective transport of ions. Our interfacial shielding strategy sheds light on developing crystalline cage membranes for efficient ion separations.\n                  <\/jats:p>","DOI":"10.1002\/anie.7051685","type":"journal-article","created":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T08:15:58Z","timestamp":1777623358000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["<i>\u03b2<\/i>\n                    \u2010Ketoenamine Porous Organic Cage Membranes Through Hydrogel\u2010Induced Shielding for Efficient Ion Sieving"],"prefix":"10.1002","volume":"65","author":[{"given":"Tiantian","family":"Chen","sequence":"first","affiliation":[{"name":"School of Chemical Engineering Zhengzhou University  Zhengzhou China"},{"name":"Department of Chemical Engineering KU Leuven  Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Penglin","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Chemical 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