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Title: Reversible and irreversible colossal barocaloric effects in plastic crystals
Author: Aznar, Araceli
Lloveras, Pol
Barrio, Maria
Negrier, Philippe
Planes Vila, Antoni
Mañosa, Lluís
Mathur, Neil D.
Moya, Xavier
Tamarit, Josep Lluís
Keywords: Ciència dels materials
Cristalls moleculars
Materials science
Molecular crystals
Issue Date: 2020
Publisher: Royal Society of Chemistry
Abstract: The extremely large latent heat exchanged in phase transitions involving strong molecular orientational disordering has recently led to the proposal of plastic crystals as a feasible solution for solid-state barocaloric eco-friendly cooling technologies. Here we determine the reversible barocaloric response of four plastic crystals derived from neopentane [C(CH3)4]: (NH2)C(CH2OH)3 (TRIS for short), (NH2)(CH3)C(CH2OH)2 (AMP), (CH3)C(CH2OH)3 (PG) and (CH3)3C(CH2OH) (NPA). All of them display colossal entropy changes at their ordered-plastic phase transition, which is a primal requirement for competitive barocaloric materials. However, we show that it is also important to verify that the large barocaloric effects can be achieved using pressures that, while being moderate, are large enough to overcome the pressure-dependent hysteresis. From this quantity and using the quasi-direct method, we determine the minimum pressure needed to achieve reversible barocaloric effects, prev, for each compound. Specifically, we find a small and moderate prev for PG and NPA, respectively, which therefore display colossal reversible barocaloric effects comparable to harmful fluids used in current refrigerators and thus confirm the potential of plastic crystals as excellent alternatives. Instead, in TRIS and AMP, the obtained prev is excessive to yield reversible barocaloric effects useful for cyclic applications.
Note: Versió postprint del document publicat a:
It is part of: Journal of Materials Chemistry A, 2020, vol. 8, p. 639-647
Related resource:
ISSN: 2050-7488
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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