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- W4387363406 abstract "CALF-20 is a zinc-triazole-oxalate-based metal–organic framework (MOF) that exhibits selective CO2 physisorption, which makes it attractive for potential applications in CO2 capture. However, to implement such applications, the CALF-20 structure must endure extended exposure to environmental conditions that may lead to changes in structure, chemistry, and, hence, performance. Here we find that the originally reported CALF-20 phase (now denoted α-CALF-20) undergoes a structure transformation following exposure to humid environments to generate a new polymorph, β-CALF-20, identified here through combined synchrotron powder X-ray diffraction and pair distribution function (PDF) analysis. This α-to-β transformation is fully reversible with α-CALF-20 being regenerated by treating β-CALF-20 under dry air or vacuum. The rapid reversion of β- to α-CALF-20 under conditions relevant to measuring the gas adsorption isotherm required the CO2 adsorption properties for β-CALF-20 to be evaluated computationally. Experimental evaluation of the adsorption behavior of β-CALF-20 is not practical. These analyses suggest that β-CALF-20 has a higher CO2 heat of adsorption than α-CALF-20, which may be advantageous to CO2 sorption selectivity at low partial pressures." @default.
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- W4387363406 date "2023-10-05" @default.
- W4387363406 modified "2023-10-06" @default.
- W4387363406 title "Humidity-Responsive Polymorphism in CALF-20: A Resilient MOF Physisorbent for CO<sub>2</sub> Capture" @default.
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- W4387363406 doi "https://doi.org/10.1021/acsmaterialslett.3c00930" @default.
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