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      Maximizing the right stuff: The trade-off between membrane permeability and selectivity

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          The upper bound revisited

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            Graphene based materials: Past, present and future

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              Membranes. Metal-organic framework nanosheets as building blocks for molecular sieving membranes.

              Layered metal-organic frameworks would be a diverse source of crystalline sheets with nanometer thickness for molecular sieving if they could be exfoliated, but there is a challenge in retaining the morphological and structural integrity. We report the preparation of 1-nanometer-thick sheets with large lateral area and high crystallinity from layered MOFs. They are used as building blocks for ultrathin molecular sieve membranes, which achieve hydrogen gas (H2) permeance of up to several thousand gas permeation units (GPUs) with H2/CO2 selectivity greater than 200. We found an unusual proportional relationship between H2 permeance and H2 selectivity for the membranes, and achieved a simultaneous increase in both permeance and selectivity by suppressing lamellar stacking of the nanosheets.
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                Author and article information

                Journal
                Science
                Science
                American Association for the Advancement of Science (AAAS)
                0036-8075
                1095-9203
                June 15 2017
                June 16 2017
                : 356
                : 6343
                : eaab0530
                Article
                10.1126/science.aab0530
                28619885
                2409faf6-4926-4ebe-89ab-f18cb0f34269
                © 2017

                http://www.sciencemag.org/about/science-licenses-journal-article-reuse

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