Phase-transformable metal-organic polyhedra for membrane processing and switchable gas separation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39537589.
- Also identified by DOI 10.1038/s41467-024-53560-3 and PMC identifier 11560977.
- Licence recorded as CC BY-NC-ND.
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Abstract
The capability of materials to interconvert between different phases provides more possibilities for controlling materials' properties without additional chemical modification. The study of state-changing microporous materials just emerged and mainly involves the liquefication or amorphization of solid adsorbents into liquid or glass phases by adding non-porous components or sacrificing their porosity. The material featuring reversible phases with maintained porosity is, however, still challenging. Here, we synthesize metal-organic polyhedra (MOPs) that interconvert between the liquid-glass-crystal phases. The modular synthetic approach is applied to integrate the core MOP cavity that provides permanent microporosity with tethered polymers that dictate the phase transition. We showcase the processability of this material by fabricating a gas separation membrane featuring tunable permeability and selectivity by switching the state. Compared to most conventional porous membranes, the liquid MOP membrane particularly shows the selectivity for CO<sub>2</sub> over H<sub>2</sub> with enhanced permeability.