Assertion: cage's material | /r/HasProperty | studied for 2d crystals
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text: Various porous materials have been studied for hydrogen isotope separation, including carbons (13, 14), carbon nanotubes (15), zeolites (16, 17), metal-organic frameworks (MOFs) (6, 18, 19), covalent organic frameworks (COFs) (20), and 2D crystals (21).