Thermodynamic evidence of a transition in ZIF-8 upon CH₄ sorption

Abstract

We present the results of an experimental study of methane sorption in ZIF-8.

Gating effect for gas adsorption in microporous materials—mechanisms and applications

“…104 For the flexible MOF ZIF-8 with rotational ligands, the sub-steps in the isotherms were the direct thermodynamic evidence of the structural transition induced by the guest molecules. 106,107 Gallaba et al explored the CH 4 adsorption in ZIF-8 over a low-temperature range and observed the clear substeps that corresponded to increasing uptake, which occurred during the structural switch of ZIF-8 from an original structure to a high-pressure one. 107 The non-vertical steps suggested the continuous transition of ZIF-8.…”

“…106,107 Gallaba et al explored the CH 4 adsorption in ZIF-8 over a low-temperature range and observed the clear substeps that corresponded to increasing uptake, which occurred during the structural switch of ZIF-8 from an original structure to a high-pressure one. 107 The non-vertical steps suggested the continuous transition of ZIF-8. The presence of a broad peak in the isosteric heat of adsorption also implied a gate-opening transition.…”