Calculation of Self, Corrected, and Transport Diffusivities of Isopropyl Alcohol in UiO-66

Overview

Journal Nanomaterials (Basel)

Date 2023 Jun 10

PMID 37299696

Authors

Chinmay V Mhatre

Jacob J Wardzala

Priyanka B Shukla

Mayank Agrawal

J Karl Johnson

Affiliations

Soon will be listed here.

Abstract

The UiO-6x family of metal-organic frameworks has been extensively studied for applications in chemical warfare agent (CWA) capture and destruction. An understanding of intrinsic transport phenomena, such as diffusion, is key to understanding experimental results and designing effective materials for CWA capture. However, the relatively large size of CWAs and their simulants makes diffusion in the small-pored pristine UiO-66 very slow and hence impractical to study directly with direct molecular simulations because of the time scales required. We used isopropanol (IPA) as a surrogate for CWAs to investigate the fundamental diffusion mechanisms of a polar molecule within pristine UiO-66. IPA can form hydrogen bonds with the μ3-OH groups bound to the metal oxide clusters in UiO-66, similar to some CWAs, and can be studied by direct molecular dynamics simulations. We report self, corrected, and transport diffusivities of IPA in pristine UiO-66 as a function of loading. Our calculations highlight the importance of the accurate modeling of the hydrogen bonding interactions on diffusivities, with about an order of magnitude decrease in diffusion coefficients when the hydrogen bonding between IPA and the μ3-OH groups is included. We found that a fraction of the IPA molecules have very low mobility during the course of a simulation, while a small fraction are highly mobile, exhibiting mean square displacements far greater than the ensemble average.

Citing Articles

Intermolecular Hydrogen Bonding in Associated Fluids: The Case of Isopentyl Alcohol Dissolved in Carbon Tetrachloride.

Tsigoias S, Kouderis C, Mylona-Kosmas A, Kalampounias A Molecules. 2023; 28(17).

PMID: 37687113 PMC: 10488694. DOI: 10.3390/molecules28176285.

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