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The growth of high density network of MOF nano-crystals across macroporous metal substrates – solvothermal synthesis versus rapid thermal deposition
journal contributionposted on 2018-01-01, 00:00 authored by James Wainaina Maina, Cristina Pozo-GonzaloCristina Pozo-Gonzalo, Andrea Merenda, Lingxue KongLingxue Kong, J A Schütz, Ludovic DumeeLudovic Dumee
Fabrication of metal organic framework (MOF) films and membranes across macro-porous metal substrates is extremely challenging, due to the large pore sizes across the substrates, poor wettability, and the lack of sufficient reactive functional groups on the surface, which prevent high density nucleation of MOF crystals. Herein, macroporous stainless steel substrates (pore size 44 × 40 μm) are functionalized with amine functional groups, and the growth of ZIF-8 crystals investigated through both solvothermal synthesis and rapid thermal deposition (RTD), to assess the role of synthesis routes in the resultant membranes microstructure, and subsequently their performance. Although a high density of well interconnected MOF crystals was observed across the modified substrates following both techniques, RTD was found to be a much more efficient route, yielding high quality membranes under 1 h, as opposed to the 24 h required for solvothermal synthesis. The RTD membranes also exhibited high gas permeance, with He permeance of up to 2.954 ± 0.119 × 10 −6 mol m −2 s −1 Pa −1 , and Knudsen selectivities for He/N 2 , Ar/N 2 and CO 2 /N 2 , suggesting the membranes were almost defect free. This work opens up route for efficient fabrication of MOF films and membranes across macro-porous metal supports, with potential application in electrically mediated separation applications.
JournalApplied surface science
Pagination401 - 408
LocationAmsterdam, The Netherlands
Publication classificationC1 Refereed article in a scholarly journal
Copyright notice2017, Elsevier B.V.
Metal organic frameworksHybrid membranesGas permeationRapid thermal depositionSolvothermal synthesisScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, Coatings & FilmsPhysics, AppliedPhysics, Condensed MatterChemistryMaterials SciencePhysicsORGANIC FRAMEWORK MEMBRANESMIXED-MATRIX MEMBRANESGAS SEPARATIONCOMPOSITE MEMBRANESZIF-8 MEMBRANESHELIUM SEPARATIONROOM-TEMPERATUREHOLLOW-FIBERCO2 CAPTURESELECTIVITY