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However, fabricating high\u2010quality COF membranes, particularly on industrial\u2010preferred hollow fiber substrates, remains challenging. This study introduces a novel vapor\/vapor\u2010solid (V\/V\u2212S) method for growing ultrathin crystalline TpPa\u20101 COF membranes on the inner lumen surface of alumina hollow fibers (TpPa\u20101\/Alumina). Through vapor\u2010phase monomer introduction onto polydopamine\u2010modified alumina at 170\u2009\u00b0C and 1\u2005atm, efficient polymerization and crystallization occur at the confined V\u2212S interface. This enables one\u2010step growth within 8\u2005h, producing 100\u2005nm thick COF membranes with strong substrate adhesion. TpPa\u20101\/Alumina exhibits exceptional stability and performance over 80\u2005h in continuous cross\u2010flow organic solvent nanofiltration (OSN), with methanol permeance of about 200\u2005L\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    \u2009h\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u2009bar\n                    <jats:sup>\u22121<\/jats:sup>\n                    and dye rejection with molecular weight cutoff (MWCO) of approximately 700\u2005Da. Moreover, the versatile V\/V\u2212S method synthesizes two additional COF membranes (TpPa2Cl\/Alumina and TpHz\/Alumina) with different pore sizes and chemical environments. Adjusting the COF membrane thickness between 100\u2013500\u2005nm is achievable easily by varying the growth cycle numbers. Notably, TpPa2Cl\/Alumina demonstrates excellent OSN performance in separating the model active pharmaceutical ingredient glycyrrhizic acid (GA) from dimethyl sulfoxide (DMSO), highlighting the method's potential for large\u2010scale industrial applications.\n                  <\/jats:p>","DOI":"10.1002\/anie.202406830","type":"journal-article","created":{"date-parts":[[2024,5,24]],"date-time":"2024-05-24T13:14:54Z","timestamp":1716556494000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Vapor\/Vapor\u2010Solid Interfacial Growth of Covalent Organic Framework Membranes on Alumina Hollow Fiber for Advanced Molecular Separation"],"prefix":"10.1002","volume":"63","author":[{"given":"Wei Jian Samuel","family":"Siow","sequence":"first","affiliation":[{"name":"School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University  62 Nanyang Drive Singapore 637459 Singapore"},{"name":"Singapore 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Technological University  62 Nanyang Drive Singapore 637459 Singapore"},{"name":"Nanyang Environment and Water Research Institute Interdisciplinary Graduate Programme Nanyang Technological University  61 Nanyang Drive Singapore 637335 Singapore"},{"name":"Environmental Chemistry and Materials Centre Nanyang Environment and Water Research Institute Nanyang Technological University  1 Cleantech Loop Singapore 637141 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4293-8924","authenticated-orcid":false,"given":"Markus","family":"Kraft","sequence":"additional","affiliation":[{"name":"School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University  62 Nanyang Drive Singapore 637459 Singapore"},{"name":"Cambridge Centre for Carbon Reduction in Chemical Technologies Campus for Research Excellence and Technological Enterprise National Research Foundation, CREATE Tower  1 Create Way Singapore 138602 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