用于多用途冷却和冷藏的热材料二正丁基四氟硼酸铵的结构和热性能关系,Journal of Materials Chemistry A

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用于多用途冷却和冷藏的热材料二正丁基四氟硼酸铵的结构和热性能关系
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-09-16 , DOI: 10.1039/d3ta04063a
Javier García-Ben ₁ , Juan Manuel Bermúdez-García ₁ , Richard J. C. Dixey ₂ , Ignacio Delgado-Ferreiro ₁ , Antonio Luis Llamas-Saiz ₃ , Jorge López-Beceiro ₄ , Ramón Artiaga ₄ , Alberto García-Fernández ₅ , Ute B. Cappel ₅ , Bruno Alonso ₆ , Socorro Castro-García ₁ , Anthony E. Phillips ₂ , Manuel Sánchez-Andújar ₁ , María Antonia Señarís-Rodríguez ₁

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如今，全球约 46% 的食品生产需要制冷，通常通过主动蒸汽压缩（基于液-气转变制冷剂）或被动冷藏（基于固-液相变材料， SL-PCM）。然而，为了避免转变过程中的流体损失，这两种应用都需要具有固-固转变的新型热材料。在这项工作中，我们发现 [DBA][BF ₄ ] (DBA = di- n-丁基铵）是一种有前景的固-固相变热材料。这种化合物的热性能不仅对于主动气压制冷，而且对于被动冷藏也具有重要意义，这使其成为一种独特的多用途热材料。观察到的蓄冷能力非常接近商用SL-PCM（E∼135kJkg ⁻¹），而压力引起的热变化（ΔS∼ [ 200–270]JK ^−1kg − ¹）为优于大多数压热材料，在较低压力下工作（p〜 [500–1000] 巴）。此外，这种材料的工作温度范围非常适合食品保存（250-310 K），这比大多数气压材料具有很大的优势。除了热性能之外，我们还进行了深入的结构表征，揭示了[DBA] ⁺阳离子和[BF ₄ ] ^-阴离子的渐进结构无序是此类热性能的根源，这将有助于未来增强热材料的合理设计。

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Structure and thermal property relationships in the thermomaterial di-n-butylammonium tetrafluoroborate for multipurpose cooling and cold-storage

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 (ΔS ∼ [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.

更新日期：2023-09-16

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