Abstract
Metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) have been thoroughly investigated with regards to applications in gas separation membranes in the past years. More recently, new preparation methods for MOFs and COFs as particles and thin‐film membranes, as well as for mixed‐matrix membranes (MMMs) have been developed. We will highlight novel processes and highly functional materials: Zeolitic imidazolate frameworks (ZIFs) can be transformed into glasses and we will give an insight into their use for membranes. In addition, liquids with permanent porosity offer solution processability for the manufacture of extremely potent MMMs. Also, MOF materials influenced by external stimuli give new directions for the enhancement of performance by in situ techniques. Presently, COFs with their large pores are useful in quantum sieving applications, and by exploiting the stacking behavior also molecular sieving COF membranes are possible. Similarly, porous polymers can be constructed using MOF templates, which then find use in gas separation membranes.
Highlights
(MMMs) using Metal–organic frameworks (MOFs)-5,[4] the first neat works (COFs) have been thoroughly investigated with regards to applications in gas separation membranes in the past years
COFs with their large pores are useful in quantum sieving applications, and by exploiting the stacking behavior molecular the first experimental CO2-separating MMMs using exfoliated NUS-2 and NUS-3 sheets were reported in 2016.[10]. When MOF membranes were first developed, the aim was to make these sieving COF membranes are possible
Owing to the high structural variety that is offered by the chemistry of MOF materials, special techniques are needed to prepare sheet-like particles
Summary
A MMM is made by mixing MOF or COF particles into a polymer matrix and processing the solution into a film or Bahram Hosseini Monjezi studied Chemistry at the Isfahan University of Technology (Iran) and received his master’s degree with Prof. Alexander Knebel studied Chemistry at the Leibniz University Hanover (Germany) and received his PhD in Physical Chemistry with Jürgen Caro in 2018 He conducted research with Jorge Gascon at the KAUST Catalysis Centre of the King Abdullah University of Science Technology (Saudi Arabia). Afterwards he was a postdoctoral fellow at the Institute of Functional Interfaces (IFG) with Christof Wçll at the Karlsruhe Institute of Technology (KIT) (Germany), where he recently became Junior Research Group Leader. In his research, he combines MOFs, COFs, porous liquids, and polymer mixed-matrix systems in thin-film gasseparation membranes. Owing to the high structural variety that is offered by the chemistry of MOF materials, special techniques are needed to prepare sheet-like particles
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