ゼオライトを添加したマンニトール系潜熱蓄熱材の過冷却緩和に関する関する論文が公開されました．
Xudong Tang, Junichi Ryu, Int. J. Thermophys., 44, 58 (2023).
Abstract
D-mannitol, as a potential phase change material (PCM), has a wide range of applications in solar cooling, building heating, domestic hot water systems, and industrial waste heat recovery. However, the polymorphism exhibited by D-mannitol is also noteworthy for its long-term use in practical applications. In this work, eight typical zeolites with the potential to improve the supercooling of D-mannitol were used as additive to prepare D-mannitol-based PCMs with different zeolite content. Three polymorphs of D-mannitol were confirmed in cyclic differential scanning calorimetry measurement combined with X-ray diffraction and Fourier transform infrared analysis. We found that pure D-mannitol treated without zeolite exhibited a smooth differential scanning calorimetry melting curve attributable to the α-D-mannitol polymorph during the heat storage phase. When zeolite was added to the system, the α-D-mannitol showed a tendency to change to δ-forms during the cyclic experiment. Usually, in the initial stage of this transition, its appearance is visually slight on the DSC curve. This transition can be identified by X-ray diffraction and Fourier transform infrared analysis. The tendency increases with the addition of zeolite in the system or the number of cycles of cyclic experiments. Polymorphisms of D-mannitol affect thermal parameters, such as the melting point, when it is used as a phase change material. This research provides technical support for the practical application of D-mannitol as a phase change material in the future.
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