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The development of high\u2010performance anion management systems is still in its early stages. Chitin\u2014a sustainable polysaccharide featuring a Bouligand\u2011type hierarchical structure and readily modifiable functional groups\u2014offers a uniquely advantageous platform for creating positively charged nanofluidic materials that address this gap. In this perspective, we highlight how directional disassembly can unlock a family of two\u2010dimensional chitin nanomaterials, ranging from dense and porous nanosheets to sub\u2010nanosheets and single\u2010molecular\u2010layer nanoribbons. These size\u2011defined units establish distinct ion transport behaviors, revealing that dimensional engineering and crystalline\u2010domain engineering act as dual core strategies for tuning ion pathways and selectivity. We further argue that crystalline\u2010domain regulation presents a complementary strategy: by expanding polymer chain spacing through precise coordination chemistry, additional intra\u2010layer ion channels can be introduced without compromising structural stability. Taken together, these insights suggest a broader design paradigm in which size\u2010effect modulation and crystalline\u2010domain engineering can be jointly harnessed to construct next\u2010generation chitin\u2010based nanofluidic membranes. Such integrated strategies may pave the way for high\u2010efficiency anion transport control, helping to overcome the long\u2010standing challenges in developing sustainable biomass\u2010based ion\u2010selective systems.<\/jats:p>","DOI":"10.1002\/smll.73834","type":"journal-article","created":{"date-parts":[[2026,5,17]],"date-time":"2026-05-17T16:06:31Z","timestamp":1779033991000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Dimensional and Crystalline\u2010Domain Engineering of 2D Chitin Nanomaterials for Selective Ion Transport"],"prefix":"10.1002","volume":"22","author":[{"given":"Yue","family":"Shu","sequence":"first","affiliation":[{"name":"School of Materials and Chemistry Anhui Agricultural University  Hefei Anhui China"},{"name":"School of Chemistry and Chemical Engineering Hefei University of Technology  Hefei Anhui 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