Highways for water molecules: Interplay between nanostructure and water vapor transport in block copolymer membranes
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AuthorsAkhtar, Faheem Hassan
Villalobos, Luis Francisco
Nunes, Suzana Pereira
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Biological and Environmental Sciences and Engineering (BESE) Division
Chemical and Biological Engineering Program
Environmental Science and Engineering Program
Materials Science and Engineering Program
Physical Sciences and Engineering (PSE) Division
Water Desalination and Reuse Research Center (WDRC)
Online Publication Date2018-11-24
Print Publication Date2019-02
Permanent link to this recordhttp://hdl.handle.net/10754/630181
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AbstractWater 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.
CitationAkhtar 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.
SponsorsThe 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.
JournalJournal of Membrane Science