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    Highways for water molecules: Interplay between nanostructure and water vapor transport in block copolymer membranes

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    Type
    Article
    Authors
    Akhtar, Faheem cc
    Vovushua, Hakkim
    Villalobos, Luis Francisco cc
    Shevate, Rahul
    Kumar, Mahendra cc
    Nunes, Suzana Pereira cc
    Schwingenschlögl, Udo cc
    Peinemann, Klaus-Viktor cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Computational Physics and Materials Science (CPMS)
    Environmental Science and Engineering Program
    Material Science and Engineering Program
    Nanostructured Polymeric Membrane Lab
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2018-11-24
    Online Publication Date
    2018-11-24
    Print Publication Date
    2019-02
    Permanent link to this record
    http://hdl.handle.net/10754/630181
    
    Metadata
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    Abstract
    Water vapor removal is a crucial process for several industries (e.g., air conditioning systems, flue gas dehydration, compressed air drying etc.). An effective dehumidification has the potential to drastically reduce the energy consumption and the overall cost of a process stream. Membranes with high water permeance and selectivity are promising candidates to achieve an energy-efficient water removal. We propose self-assembled membranes with interconnected and ordered hydrophilic domains that act as extremely fast water transport highways (water channels). We used a commercial amphiphilic pentablock copolymer (Nexar™), which has the ability to form long-range, self-ordering nanoscale morphologies with rigid end-blocks and a flexible molecular network where polar and non-polar solvents regulated the final morphologies of the membranes are systematically investigated. Our results demonstrate how well-defined periodic morphology allow for molecular level control in effective removal of water vapor. The membranes with ordered hydrophilic nanochannels present a 6-fold improvement in water vapor permeability and a 14-fold increase in water vapor/N2 selectivity compared to Nexar™ membranes with disordered domains.Molecular dynamics stimulations are carried out on the self-assembly behavior of block copolymer solution in different solvents. In addition, sorption and desorption kinetics studies for Nexar™ films were correlated to the different morphologies imaged by transmission electron, atomic force and environmental scanning electron microscopy.
    Citation
    Akhtar FH, Vovushua H, Villalobos LF, Shevate R, Kumar M, et al. (2019) Highways for water molecules: Interplay between nanostructure and water vapor transport in block copolymer membranes. Journal of Membrane Science 572: 641–649. Available: http://dx.doi.org/10.1016/j.memsci.2018.11.050.
    Sponsors
    The research reported in this publication was supported by the funding from King Abdullah University of Science and Technology (KAUST), Kingdom of Saudi Arabia. Table of content was created by Xavier Pita, Scientific illustrator at KAUST.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2018.11.050
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0376738818324979
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2018.11.050
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Material Science and Engineering Program; Computational Physics and Materials Science (CPMS); Water Desalination and Reuse Research Center (WDRC)

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