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submitted on 16.07.2019 and posted on 17.07.2019by Christopher W. Ashling, Duncan Johnstone, Remo Widmer, Jingwei Hou, Sean M. Collins, Adam Sapnik, Alice Bumstead, Paul A. Midgley, Philip A. Chater, David
A. Keen, Thomas Bennett
Metal-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 stabilisation 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 were synthesised and
characterised using X-ray diffraction and nuclear magnetic resonance
spectroscopy. An upper limit of MIL-53 that can be stabilised in the composite
was determined. The nanostructure of the composites was probed using pair
distribution function analysis and scanning transmission electron microscopy.
The distribution and integrity of the crystalline component was determined, and these
findings related to the MOF-CGC gas adsorption capacity in order to identify
the optimal loading necessary for maximum CO2 sorption capacity.