Structure and thermal property relationships in the thermomaterial di-n-butylammonium tetrafluoroborate for multipurpose cooling and cold-storage
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Structure and thermal property relationships in the thermomaterial di-n-butylammonium tetrafluoroborate for multipurpose cooling and cold-storageAutor(es)
Data
2023-11-07Cita bibliográfica
J. García-Ben, J. M. Bermúdez-García, R. J. C. Dixey, I. Delgado-Ferreiro, A. L. Llamas-Saiz, J. López-Beceiro, R. Artiaga, A. García-Fernández, U. B. Cappel, B. Alonso, S. Castro-García, A. E. Phillips, M. Sánchez-Andújar and M. A. Señarís-Rodríguez, J. Mater. Chem. A, 2023, 11, 22232 DOI: 10.1039/D3TA04063A
Resumo
[Abstract]: Nowadays around 46% of food production around the world requires refrigeration, which is generally
provided either by active vapour-compression (based on refrigerants with liquid–gas transitions) or
passive cold-storage (based on solid-to-liquid phase change materials, SL-PCMs). However, in order to
avoid fluid losses during the transitions, new thermomaterials with solid–solid transitions are desired for
both applications. In this work, we find that [DBA][BF4] (DBA = di-n-butylammonium) is a promising
thermomaterial with solid–solid phase transitions. This compound presents thermal properties of great
interest not only for active barocaloric refrigeration, but also for passive cold-storage, which make this
a unique multipurpose thermomaterial. The observed cold-storage capacity is very close to that of
commercial SL-PCMs (E ∼ 135 kJ kg−1), while the pressure-induced thermal changes (DS ∼ [200–270] J
K−1 kg−1) are superior to those of most barocaloric materials, operating under lower pressures (p ∼
[500–1000] bar). Moreover, the operating temperature range of this material is very adequate for food
preservation (250–310 K), which is a great advantage over most barocaloric materials. Beyond the
thermal properties, we perform deep structural characterization, which reveals a progressive structural
disorder of the [DBA]+ cations and [BF4]− anions as the origin of such thermal properties, which will help
the future rational design of enhanced thermomaterials.
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Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
ISSN
2050-7496