Lv Xifeng, Fan Chaoqun, Han Ying, Tang Xiaojin, Zhang Changwei, Cai Di, Chen Huidong
College of Chemistry and Chemical Engineering, Tarim University, Alar 843300, China.
SINOPEC Research Institute of Petroleum Processing, Beijing 100083, China.
Materials (Basel). 2023 Sep 7;16(18):6101. doi: 10.3390/ma16186101.
Aiming to promote the application of D-mannitol in the field of phase change thermal storage, obstacles, including low thermal storage efficiency and high supercooling, should be properly disposed of. The adoption of adaptable and low-cost supporting materials to make shape-stable phase change materials (ss-PCMs) affordable is a primary solution to solve the above shortcomings. In this study, high-performance ss-PCM for effective medium-temperature heat storage was prepared using expanded vermiculite as the support for D-mannitol preservation. Among the three candidates that treated the raw vermiculite by dilute acid, calcination, and microwave heating, the calcinated expanded vermiculite (CV) was characterized as the most suitable one. After impregnating D-mannitol into the CV carrier by vacuum, a melting enthalpy of 205.1 J/g and a crystallization enthalpy of 174.1 J/g were achieved by the as-received CV/D-mannitol ss-PCM. Additionally, the supercooling of the ss-PCM was reduced to 45.6 °C. The novel CV/D-mannitol ss-PCM also exhibited excellent reusability and stability. All the findings indicate that the abundant and inexpensive CV exhibited great potential as the supporting material for D-mannitol-based ss-PCMs, which allow effective waste heat recovery and temperature regulation.
为促进D-甘露醇在相变蓄热领域的应用，包括蓄热效率低和过冷度高在内的障碍应得到妥善解决。采用适应性强且成本低的支撑材料以使形状稳定的相变材料（ss-PCM）价格合理，是解决上述缺点的主要解决方案。在本研究中，以膨胀蛭石作为D-甘露醇保存的支撑体，制备了用于有效中温蓄热的高性能ss-PCM。在通过稀酸、煅烧和微波加热处理原始蛭石的三种候选材料中，煅烧膨胀蛭石（CV）被表征为最合适的一种。通过真空将D-甘露醇浸渍到CV载体中后，所得的CV/D-甘露醇ss-PCM的熔化焓为205.1 J/g，结晶焓为174.1 J/g。此外，ss-PCM的过冷度降低到了45.6℃。新型CV/D-甘露醇ss-PCM还表现出优异的可重复使用性和稳定性。所有这些发现表明，丰富且廉价的CV作为基于D-甘露醇的ss-PCM的支撑材料具有巨大潜力，可实现有效的废热回收和温度调节。
