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12 items found (0 items not approved), displaying 11 to 12.[First/Prev] 1, 2 [Next/Last]

Instruments / Technical Area	Publication Details	Published	Actions
E02-JEM ARM 300CF I15-1-X-ray Pair Distribution Function (XPDF)	A new route to porous metal–organic framework crystal–glass composites Shichun Li , Shuwen Yu , Sean M. Collins , Duncan N. Johnstone , Christopher W. Ashling , Adam F. Sapnik , Philip A. Chater , Dean S. Keeble , Lauren N. Mchugh , Paul A. Midgley , David A. Keen , Thomas D. Bennett Chemical Science 11, 9910 - 9918 DOI: 10.1039/D0SC04008H Diamond Proposal Number(s): [20038, 22632, 21979] Open Access Show Abstract ▼ Abstract: Metal–organic framework crystal–glass composite (MOF CGC) materials consist of a crystalline MOF embedded within a MOF–glass matrix. In this work, a new synthetic route to these materials is demonstrated through the preparation of two ZIF-62 glass-based CGCs, one with crystalline ZIF-67 and the other with crystalline UiO-66. Previous attempts to form these CGCs failed due to the high processing temperatures involved in heating above the melting point of ZIF-62. Annealing of the ZIF-62 glass above the glass transition with each MOF however leads to stable CGC formation at lower temperatures. The reduction in processing temperatures will enable the formation of a greatly expanded range of MOF CGCs.	Sep 2020
I11-High Resolution Powder Diffraction I12-JEEP: Joint Engineering, Environmental and Processing	Single-step synthesis and interface tuning of core–shell metal–organic framework nanoparticles Kieran W. P. Orr , Sean M. Collins , Emily M. Reynolds , Frank Nightingale , Hanna L. B. Bostroem , Simon J. Cassidy , Daniel M. Dawson , Sharon E. Ashbrook , Oxana Magdysyuk , Paul A. Midgley , Andrew L. Goodwin , Hamish H.-m. Yeung Chemical Science 13 DOI: 10.1039/D0SC03940C Diamond Proposal Number(s): [20946, 18786] Open Access Show Abstract ▼ Abstract: Control over the spatial distribution of components in metal–organic frameworks has potential to unlock improved performance and new behaviour in separations, sensing and catalysis. We report an unprecedented single-step synthesis of multi-component metal–organic framework (MOF) nanoparticles based on the canonical ZIF-8 (Zn) system and its Cd analogue, which form with a core–shell structure whose internal interface can be systematically tuned. We use scanning transmission electron microscopy, X-ray energy dispersive spectroscopy and a new composition gradient model to fit high-resolution X-ray diffraction data to show how core–shell composition and interface characteristics are intricately controlled by synthesis temperature and reaction composition. Particle formation is investigated by in situ X-ray diffraction, which reveals that the spatial distribution of components evolves with time and is determined by the interplay of phase stability, crystallisation kinetics and diffusion. This work opens up new possibilities for the control and characterisation of functionality, component distribution and interfaces in MOF-based materials.	Feb 2021

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