Observation of a Reversible Order‐Order Transition in a Metal‐Organic Framework – Ionic Liquid Nanocomposite Phase‐Change Material
Source abstract
Abstract
Abstract Metal‐organic framework (MOF) composite materials containing ionic liquids (ILs) have been proposed for a range of potential applications, including gas separation, ion conduction, and hybrid glass formation. Here, an order transition in an IL@MOF composite is discovered using CuBTC (copper benzene‐1,3,5‐tricarboxylate) and [EMIM][TFSI] (1‐ethyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide). This transition – absent for the bare MOF or IL – provides an extended super‐cooling range and latent heat at a capacity similar to that of soft paraffins, in the temperature range of ≈220 °C. Structural analysis and in situ monitoring indicate an electrostatic interaction between the IL molecules and the Cu paddle‐wheels, leading to a decrease in pore symmetry at low temperature. These interactions are reversibly released above the transition temperature, which reflects in a volume expansion of the MOF‐IL composite.
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Research context
OpenAlex topics: Phase Change Materials Research · Ionic liquids properties and applications · Material Dynamics and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Otto Schott Institute of Materials Research University of Jena 07743 Jena Germany
Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB30FS UK
Center of Energy and Environmental Chemistry University of Jena 07743 Jena Germany
Institute of Technical Chemistry and Environmental Chemistry University of Jena 07743 Jena Germany
ISIS Facility, Rutherford Appleton Laboratory Harwell Campus Didcot Oxfordshire OX11 0QX UK
Diamond Light Source Ltd., Diamond House Harwell Campus Didcot Oxfordshire OX11 0QX UK
Yusuf Hamied Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW UK
Insituto de Ciencia molecular Universidad de Valencia c/ Catedrático José Beltrán, 2 Paterna 46980 Spain
Funding
European Research Council · Carl-Zeiss-Stiftung
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