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Synthesis and Properties of a Compositional Series of MIL-53(Al) Metal–Organic Framework Crystal-Glass Composites
journal contribution
posted on 2019-09-18, 21:03 authored by Christopher
W. Ashling, Duncan N. Johnstone, Remo N. Widmer, Jingwei Hou, Sean M. Collins, Adam F. Sapnik, Alice M. Bumstead, Paul A. Midgley, Philip A. Chater, David A. Keen, Thomas D. BennettMetal–organic
framework crystal-glass composites (MOF-CGCs)
are materials in which a crystalline MOF is dispersed within a MOF
glass. In this work, we explore the room-temperature stabilization
of the open-pore form of MIL-53(Al), usually observed at high temperature,
which occurs upon encapsulation within a ZIF-62(Zn) MOF glass matrix.
A series of MOF-CGCs containing different loadings of MIL-53(Al) were
synthesized and characterized using X-ray diffraction and nuclear
magnetic resonance spectroscopy. An upper limit of MIL-53(Al) that
can be stabilized in the composite was determined for the first time.
The nanostructure of the composites was probed using pair distribution
function analysis and scanning transmission electron microscopy. Notably,
the distribution and integrity of the crystalline component in a sample
series were determined, and these findings were related to the MOF-CGC
gas adsorption capacity in order to identify the optimal loading necessary
for maximum CO2 sorption capacity.