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In these applications, the compositional gradients are of great relevance for successful function implementation, ranging from solvent separation to smart devices; However, the construction of functional gradient in membranes is still challenging both in scale and directions. Inspired by the specific function\u2010related, graded porous structures in glomerular filtration membranes, a general approach for constructing gradient covalent organic framework membranes (GCOMx) applying poly (ionic liquid)s (PILs)\u00a0as template is reported here. With graded distribution of highly porous covalent organic framework (COF) crystals along the membrane, GCOMx exhibts an unprecedented asymmetric solvent transport when applying different membrane sides as the solvent feed surface during filtration, leading to a much\u2010enhanced flux (10\u201318 times) of the \u201clarge\u2010to\u2010small\u201d pore flow comparing to the reverse direction, verified by hydromechanical theoretical calculations. Upon systematic experiments, GCOMx achieves superior permeance in nonpolar (hexane\u00a0\u2248260.45 LMH bar\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and polar (methanol\u00a0\u2248175.93 LMH bar\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) solvents, together with narrow molecular weight cut\u2010off (MWCO, 472\u00a0g mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and molecular weight retention onset (MWRO, &lt;182\u00a0g mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). Interestingly, GCOMx shows significant filtration performance in simulated kidney dialysis, revealing great potential of GCOMx in bionic applications.\n                  <\/jats:p>","DOI":"10.1002\/adma.202305755","type":"journal-article","created":{"date-parts":[[2024,1,16]],"date-time":"2024-01-16T13:33:17Z","timestamp":1705411997000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Bioinspired Gradient Covalent Organic Framework Membranes for Ultrafast and Asymmetric Solvent Transport"],"prefix":"10.1002","volume":"36","author":[{"given":"Hongyu","family":"Zuo","sequence":"first","affiliation":[{"name":"State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University  Shanghai 201620 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baokang","family":"Lyu","sequence":"additional","affiliation":[{"name":"State Key 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