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dc.contributor.authorOgieglo, Wojciech
dc.contributor.authorFurchner, Andreas
dc.contributor.authorMa, Xiaohua
dc.contributor.authorHazazi, Khalid
dc.contributor.authorAlhazmi, Abdulrahman
dc.contributor.authorPinnau, Ingo
dc.date.accessioned2019-05-13T11:36:42Z
dc.date.available2019-05-13T11:36:42Z
dc.date.issued2019-05
dc.identifier.citationOgieglo W, Furchner A, Ma X, Hazazi K, Alhazmi AT, et al. (2019) Thin Composite Carbon Molecular Sieve Membranes from a Polymer of Intrinsic Microporosity Precursor. ACS Applied Materials & Interfaces. Available: http://dx.doi.org/10.1021/acsami.9b04602.
dc.identifier.issn1944-8244
dc.identifier.issn1944-8252
dc.identifier.doi10.1021/acsami.9b04602
dc.identifier.urihttp://hdl.handle.net/10754/652850
dc.description.abstractUltra-thin composite carbon molecular sieve (CMS) membranes were fabricated on well-defined inorganic alumina substrates using a polymer of intrinsic microporosity (PIM) polyimide as precursor. Details of the pyrolysis-related structural development were elucidated using focused-beam, interference-enhanced spectroscopic ellipsometry (both in the UV-VIS and IR range) which allowed accurate determination of the film thickness, optical properties as well as following the chemical transformations. The pyrolysis-induced collapse of thin and bulk PIM-derived CMS membranes was compared with CMS made from a well-known non-PIM precursor 6FDA-DABA. Significant differences between the PIM and non-PIM precursors were discovered and explained by a much larger possible volume contraction in the PIM. In spite of the differences, surprisingly, the gas separation properties did not fundamentally differ. The high temperature collapse of the initially amorphous and isotropic precursor structure was accompanied by a significant molecular orientation within the formed turbostratic carbon network guided by the laterally constraining presence of the substrate. This manifested itself in the development of uniaxial optical anisotropy, which was shown to correlate with increases in gas separation selectivity for multiple technologically important gas pairs. Reduction of CMS skin thickness significantly below ~1 micron induced large losses in permeability coefficients with only small to moderate effects on selectivity. Remarkably, skin thickness reduction and physical aging seemed to superimpose onto the same trend, which explains and strengthens some of the earlier fundamental insights.
dc.description.sponsorshipThis publication is based on work supported by the King Abdullah University of Science and Technology (KAUST). IP Baseline Funding (KAUST) BAS/1/1323-01-01 (WO, XM, KH, ATA, IP). Financial support by the Ministerium für Innovation,Wissenschaft und Forschung des Landes Nordrhein-Westfalen, the Regierende Bürgermeister von Berlin – Senatskanzlei Wissenschaft und Forschung, and the Bundesministerium für Bildung und Forschung, and the European Union through the EFRE program (ProFIT grant, contract no.: 10160255, 10160265, and 10160256) is gratefully acknowledged by AF. The authors gratefully acknowledge the possibility for an extensive use of the KAUST Solar Center infrastructure.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsami.9b04602
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.9b04602.
dc.titleThin Composite Carbon Molecular Sieve Membranes from a Polymer of Intrinsic Microporosity Precursor
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentChemical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalACS Applied Materials & Interfaces
dc.eprint.versionPost-print
dc.contributor.institutionLeibniz-Institut für Analytische Wissenschaften – ISAS – e.V., Schwarzschildstraße 8, 12489 Berlin, Germany
kaust.personOgieglo, Wojciech
kaust.personMa, Xiaohua
kaust.personHazazi, Khalid
kaust.personAlhazmi, Abdulrahman
kaust.personPinnau, Ingo
kaust.grant.numberBAS/1/1323-01-01
refterms.dateFOA2020-05-01T00:00:00Z
dc.date.published-online2019-05
dc.date.published-print2019-05-22


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