A composite membrane that contains porous organic cages is shown to be dynamic, with pore aperture diameter controlled by solvent allowing for graded molecular sieving.
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The authors declare no competing interests.
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McCutcheon, J.R., Ostwal, M. & Zhang, M. Moving beyond passive separations. Nat. Mater. 21, 387–388 (2022). https://doi.org/10.1038/s41563-022-01196-3