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Flux melting of metal–organic frameworks

DOI: 10.1039/C8SC04044C DOI Help

Authors: Louis Longley (University of Cambridge) , Sean M. Collins (University of Cambridge) , Shichun Li (University of Cambridge; China Academy of Engineering Physics) , Glen J. Smales (University College London; Diamond Light Source) , Ilknur Erucar (University College London) , Ang Qiao (Wuhan University of Technology) , Jingwei Hou (University of Cambridge) , Cara M. Doherty (Future Industries, Commonwealth Scientific and Industrial Research Organisation) , Aaron W. Thornton (Future Industries, Commonwealth Scientific and Industrial Research Organisation) , Anita J. Hill (Future Industries, Commonwealth Scientific and Industrial Research Organisation) , Xiao Yu (University of California) , Nicholas J. Terrill (Diamond Light Source) , Andrew J. Smith (Diamond Light Source) , Seth M. Cohen (University of California) , Paul A. Midgley (University of Cambridge) , David A. Keen (ISIS Facility) , Shane G. Telfer (Massey University) , Thomas Bennett (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemical Science , VOL 341

State: Published (Approved)
Published: February 2019
Diamond Proposal Number(s): 18236

Open Access Open Access

Abstract: Recent demonstrations of melting in the metal–organic framework (MOF) family have created interest in the interfacial domain between inorganic glasses and amorphous organic polymers. The chemical and physical behaviour of porous hybrid liquids and glasses is of particular interest, though opportunities are limited by the inaccessible melting temperatures of many MOFs. Here, we show that the processing technique of flux melting, ‘borrowed’ from the inorganic domain, may be applied in order to melt ZIF-8, a material which does not possess an accessible liquid state in the pure form. Effectively, we employ the high-temperature liquid state of one MOF as a solvent for a secondary, non-melting MOF component. Differential scanning calorimetry, small- and wide-angle X-ray scattering, electron microscopy and X-ray total scattering techniques are used to show the flux melting of the crystalline component within the liquid. Gas adsorption and positron annihilation lifetime spectroscopy measurements show that this results in enhanced, accessible porosity to a range of guest molecules in the resultant flux melted MOF glass.

Subject Areas: Materials


Instruments: I22-Small angle scattering & Diffraction

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