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Crystal growth velocity and polymorphism of erythritol
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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10
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Solar Energy Materials and Solar Cells, Volume 301
Abstract
In recent years, erythritol has been extensively studied as a thermal storage medium. Although researchers aim to enhance or suppress crystallization of erythritol for short-term or long-term storage applications, the existing literature lacks a comprehensive description of its polymorphic crystallization process, particularly under high supercooling conditions. This study elucidates the thermal properties and crystal growth velocities of both stable and metastable polymorphs crystallized from the supercooled liquid state, along with the solid-solid transition at high supercooling conditions. For this, X-ray diffraction, differential scanning calorimetry, and optical microscopy techniques are employed. DSC analysis indicates that the latent heat of melting of the metastable polymorph is 10 % lower compared to the stable polymorph, and the solid-solid transition is associated with a heat release of 25 J/g. Furthermore, the crystal growth velocity of the stable polymorph is significantly greater compared to the metastable polymorph at low supercooling degree, but slower at high supercooling degree. Nevertheless, a new supercooling degree-dependent parameter is introduced within a crystal growth velocity model of both polymorphs. In conclusion, differences in morphology, crystal growth velocity and the latent heat can distinctly differentiate the polymorphs; however, continuous observation and either X-ray diffraction or melting point measurements are recommended to confirm the formed polymorph. Findings of this work forward the creation of reliable models for discharging and storage behavior of erythritol based short- and long-term heat storage materials.
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Turunen, K, Rehman, M M U & Seppälä, A 2026, 'Crystal growth velocity and polymorphism of erythritol', Solar Energy Materials and Solar Cells, vol. 301, 114312. https://doi.org/10.1016/j.solmat.2026.114312