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    Thin Composite Carbon Molecular Sieve Membranes from a Polymer of Intrinsic Microporosity Precursor

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    Type
    Article
    Authors
    Ogieglo, Wojciech
    Furchner, Andreas
    Ma, Xiaohua
    Hazazi, Khalid cc
    Alhazmi, Abdulrahman cc
    Pinnau, Ingo cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    BAS/1/1323-01-01
    Date
    2019-05
    Online Publication Date
    2019-05
    Print Publication Date
    2019-05-22
    Permanent link to this record
    http://hdl.handle.net/10754/652850
    
    Metadata
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    Abstract
    Ultra-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.
    Citation
    Ogieglo 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.
    Sponsors
    This 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.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/acsami.9b04602
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsami.9b04602
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsami.9b04602
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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