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Through gas permeation tests using CO2 and N2, the membrane composition containing 20 wt% [emim][Tf2N] led to the highest increase in CO2 permeability and CO2\/N2 selectivity. The use of low concentrations of additive (10\u201320 wt%) promoted a state called antiplasticization; in this state, the permeability was even more regulated by the kinetic diameter of the species which, in this work, permitted achieving a higher CO2\/N2 selectivity while increasing the CO2 permeability until an optimal condition. [emim][Tf2N] also promoted a better dispersion of SAPO-34 particles and an increase in the flexibility of the polymeric matrix when compared to a film with the same composition without [emim][Tf2N]. Moreover, the characterizations corroborated that the inclusion of [emim][Tf2N] increased the zeolite dispersion and improved the polymer\/zeolite compatibility and membrane flexibility, characterized by a decrease in glass transition temperature, which helped in the fabrication process while presenting a similar thermal resistance and hydrophilicity as neat PES membrane, without affecting the membrane structure, as indicated by FTIR and a contact angle analysis.<\/jats:p>","DOI":"10.3390\/inorganics11110447","type":"journal-article","created":{"date-parts":[[2023,11,20]],"date-time":"2023-11-20T11:31:36Z","timestamp":1700479896000},"page":"447","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["The Functionalization of PES\/SAPO-34 Mixed Matrix Membrane with [emim][Tf2N] Ionic Liquid to Improve CO2\/N2 Separation Properties"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2845-5803","authenticated-orcid":false,"given":"Jonathan S.","family":"Cardoso","sequence":"first","affiliation":[{"name":"CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, P\u00f3lo II, Rua S\u00edlvio Lima, 3030-790 Coimbra, Portugal"},{"name":"CICECO, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal"},{"name":"Mountain Research Centre (CIMO), Polytechnic Institute of Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"},{"name":"Associate Laboratory for Sustainability and Technology in Mountains Regions (SusTEC), Polytechnic Institute of Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5984-7228","authenticated-orcid":false,"given":"Zhi","family":"Lin","sequence":"additional","affiliation":[{"name":"CICECO, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1805-0252","authenticated-orcid":false,"given":"Paulo","family":"Brito","sequence":"additional","affiliation":[{"name":"Mountain Research Centre (CIMO), Polytechnic Institute of Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"},{"name":"Associate Laboratory for Sustainability and Technology in Mountains Regions (SusTEC), Polytechnic Institute of Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0739-1238","authenticated-orcid":false,"given":"Lic\u00ednio M.","family":"Gando-Ferreira","sequence":"additional","affiliation":[{"name":"CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, P\u00f3lo II, Rua S\u00edlvio Lima, 3030-790 Coimbra, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,11,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"390","DOI":"10.1016\/j.memsci.2008.04.030","article-title":"The Upper Bound Revisited","volume":"320","author":"Robeson","year":"2008","journal-title":"J. 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