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However, synthesizing well\u2010crystalline magnetite typically requires long reaction times due to the slow phase transition kinetics of goethite. Herein, a shear\u2010catalyzed strategy in microchannels is proposed for the rapid and continuous synthesis of magnetite with excellent crystallinity. The preparation process is completed in just 30\u00a0min, a 292\u2010fold enhancement over batch reactors, which achieve 68.6 wt.% magnetite after 100\u00a0h. Additionally, the resulting magnetite shows a significantly higher saturation magnetization of 59.5 emu\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , compared to 48.4 emu\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    from conventional batch reactors. The results demonstrate that Fe vacancies can be induced on goethite by shear stress in microchannels during magnetite nucleation, which not only creates more active sites for Fe\n                    <jats:sup>2<\/jats:sup>\n                    \u207a adsorption but also significantly lowers Fe\n                    <jats:sup>2+<\/jats:sup>\n                    diffusion barrier, thereby facilitating the transformation from goethite to magnetite by reducing the energy barrier for Fe\n                    <jats:sup>2<\/jats:sup>\n                    \u207a migration. Additionally, the applicability is confirmed by the successful rapid synthesis of other oxide nanomaterials (SiO\n                    <jats:sub>2<\/jats:sub>\n                    , MnO\n                    <jats:sub>2<\/jats:sub>\n                    , and ZnO), demonstrating its versatility.\n                  <\/jats:p>","DOI":"10.1002\/adma.202513592","type":"journal-article","created":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T09:19:22Z","timestamp":1760001562000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Shear\u2010Catalyzed Vacancy Engineering Enabling Rapid Synthesis of High\u2010Crystallinity Magnetite via Microfluidic Ferrous Oxidation"],"prefix":"10.1002","volume":"38","author":[{"given":"Yue","family":"Wang","sequence":"first","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiahui","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiawei","family":"Li","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Ou","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiexi","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunyan","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"},{"name":"Chinese National Engineering Research Centre for Control &amp; Treatment of Heavy Metal Pollution  Changsha 410083 China"},{"name":"State Key Laboratory of Advanced Metallurgy for Non\u2010ferrous Metals  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haiying","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"},{"name":"Chinese National Engineering Research Centre for Control &amp; Treatment of Heavy Metal Pollution  Changsha 410083 China"},{"name":"State Key Laboratory of Advanced Metallurgy for Non\u2010ferrous Metals  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xu","family":"Yan","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"},{"name":"Chinese National Engineering Research Centre for Control &amp; Treatment of Heavy Metal Pollution  Changsha 410083 China"},{"name":"State Key Laboratory of Advanced Metallurgy for Non\u2010ferrous Metals  Changsha 410083 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9810-2248","authenticated-orcid":false,"given":"Wenchao","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Metallurgy and Environment Central South University  Changsha 410083 China"},{"name":"Chinese National Engineering Research Centre for Control &amp; 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