Issue 8, 2022

Accessing accelerated molecular diffusion by nanopore alignment in a MOF thin film

Abstract

Molecular diffusion through a porous membrane can be accelerated by adjusting the nanopore windows and channels along the diffusion path, i.e., across the membrane thickness. We evaluated this process in a zeolitic imidazolate framework (ZIF-8) thin film. For the pore windows that were orthogonal to the plane of the thin film (membrane), we could realize a higher methanol vapour diffusivity (∼2×) with a lower energy of activation (∼3×), compared to a mixed-oriented ZIF-8 thin film. The variation in the diffusivities enhanced the structural isomer (1 and 2-propanol) selectivities (>7×), as indicated by vapour-phase and mass uptake studies using quartz crystal microbalance.

Graphical abstract: Accessing accelerated molecular diffusion by nanopore alignment in a MOF thin film

Supplementary files

Article information

Article type
Communication
Submitted
16 may 2022
Accepted
01 iyl 2022
First published
04 iyl 2022

Mol. Syst. Des. Eng., 2022,7, 873-877

Accessing accelerated molecular diffusion by nanopore alignment in a MOF thin film

P. Malik and R. Haldar, Mol. Syst. Des. Eng., 2022, 7, 873 DOI: 10.1039/D2ME00091A

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