doi:10.1039/c8dt03774dengPerea-Cachero, A.Sánchez-Laínez, J.Zornoza, B.Romero-Pascual, E.Téllez, C.Coronas, J.Nanosheets of MIL-53(Al) applied in membranes with improved CO 2 /N 2 and CO 2 /CH 4 selectivitiesART-2019-111243MIL-68(Al) and MIL-53(Al) are carboxylate-based metal-organic frameworks (MOFs) with the same chemical composition but different structures (polymorphs). In this study, MIL-53(Al) nanosheets of ca. 150 nm in size with an average thickness of 3.5 ± 0.9 nm were obtained after immersion of a sample composed of MIL-68(Al) and MIL-53(Al) in water under different conditions (ultrasound, stirring, reflux, 60 °C and room temperature). The disaggregated MIL-53(Al) nanosheets produced under more severe conditions were suspended in a PDMS solution and then deposited on asymmetric polyimide P84® supports under vacuum filtration to form supported mixed matrix membranes (MMMs). When applied to the separation of CO 2 /CH 4 and CO 2 /N 2 mixtures, the MMM with MIL-53(Al) nanosheets improved the CO 2 /CH 4 (28.4-28.7 vs. 22.4) and CO 2 /N 2 (19.9-23.2 vs. 17.5) selectivities of the conventional MIL-53(Al) MMM with higher CO 2 permeances (20.8-29.6 GPU vs. 9.5 GPU for CO 2 /CH 4 and 17.7-26.8 GPU vs. 11.2 GPU for CO 2 /N 2 ).2019http://zaguan.unizar.es/record/8421010.1039/c8dt03774dhttp://zaguan.unizar.es/record/84210oai:zaguan.unizar.es:84210info:eu-repo/grantAgreement/ES/DGA-FSE/T43-17Rinfo:eu-repo/grantAgreement/ES/MEC/FPU2014info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2016-77290-RDalton Transactions 48, 10 (2019), 3392-3403All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess