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Abstract Through IR microimaging the spatially and temporally resolved development of the CO 2 concentration in a ZIF‐8@6FDA‐DAM mixed matrix membrane (MMM) was visualized during transient adsorption. By recording the evolution of the CO 2 concentration, it is observed that the CO 2 molecules propagate from the ZIF‐8 filler, which acts as a transport “highway”, towards the surrounding polymer. A high‐CO 2 ‐concentration layer is formed at the MOF/polymer interface, which becomes more pronounced at higher CO 2 gas pressures. A microscopic explanation of the origins of this phenomenon is suggested by means of molecular modeling. By applying a computational methodology combining quantum and force‐field based calculations, the formation of microvoids at the MOF/polymer interface is predicted. Grand canonical Monte Carlo simulations further demonstrate that CO 2 tends to preferentially reside in these microvoids, which is expected to facilitate CO 2 accumulation at the interface.
Hwang et al. (2018) studied this question.