title: Separation membranes. Interfacial microfluidic processing of metal-organic framework hollow fiber membranes.
abstract: Molecular sieving metal-organic framework (MOF) membranes have great potential for energy-efficient chemical separations, but a major hurdle is the lack of a scalable and inexpensive membrane fabrication mechanism. We describe a route for processing MOF membranes in polymeric hollow fibers, combining a two-solvent interfacial approach for positional control over membrane formation (at inner and outer surfaces, or in the bulk, of the fibers), a microfluidic approach to replenishment or recycling of reactants, and an in situ module for membrane fabrication and permeation. We fabricated continuous molecular sieving ZIF-8 membranes in single and multiple poly(amide-imide) hollow fibers, with H2/C3H8 and C3H6/C3H8 separation factors as high as 370 and 12, respectively. We also demonstrate positional control of the ZIF-8 films and characterize the contributions of membrane defects and lumen bypass.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Brown
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA.
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Brunelli
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Kiwon
authors.initials: K
authors.lastname: Eum
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Rashidi
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Johnson
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: William J
authors.initials: WJ
authors.lastname: Koros
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA. School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. sankar.nair@chbe.gatech.edu christopher.jones@chbe.gatech.edu.
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Jones
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. sankar.nair@chbe.gatech.edu christopher.jones@chbe.gatech.edu.
authors.forename: Sankar
authors.initials: S
authors.lastname: Nair