On the Better Understanding of the Surprisingly High Performance of Metal-Organic Framework-Based Mixed-Matrix Membranes Using the Example of UiO-66 and Matrimid

Sebastian Friebe; Alexander Mundstock; Kai Volgmann; Jürgen Caro

doi:10.1021/acsami.7b13037

On the Better Understanding of the Surprisingly High Performance of Metal-Organic Framework-Based Mixed-Matrix Membranes Using the Example of UiO-66 and Matrimid

ACS Appl Mater Interfaces. 2017 Nov 29;9(47):41553-41558. doi: 10.1021/acsami.7b13037. Epub 2017 Nov 16.

Authors

Sebastian Friebe¹, Alexander Mundstock¹, Kai Volgmann¹, Jürgen Caro¹

Affiliation

¹ Institute of Physical Chemistry and Electrochemistry, Gottfried Wilhelm Leibniz University Hannover , Callinstraße 3A, 30167 Hannover, Germany.

PMID: 29112369
DOI: 10.1021/acsami.7b13037

Abstract

Metal-organic frameworks feature a certain framework flexibility, mainly due to a linker mobility inside the lattice. The latter is responsible for effects like breathing or gate-opening, thus making predictions of the sorption and diffusion behavior quite difficult. Permeation measurements on supported UiO-66 membranes at low temperatures and on polymer-coated UiO-66 membrane layers as well as ²H NMR line shape studies and nitrogen sorption measurements of UiO-66 with deuterated linkers in Matrimid as mixed-matrix membranes (MMM) indicate that the 2-site 180° flips (π-flips) of the aromatic ring are hindered by the presence of (i) the surrounding polymer Matrimid and (ii) residual solvent molecules, thus giving profound insights into the molecular understanding of gas transport through metal-organic framework-based MMMs.

Keywords: NMR spectroscopy; UiO-66; gas separation performance; linker mobility; metal−organic framework (MOF); mixed-matrix membrane (MMM); polymer coating.