Abstract
The crystallization and melting behavior of erythritol in and around two-dimensional hexagonal mesoporous silica SBA-15 with a pore diameter range of 7.5–9.2 nm were investigated. Erythritol inside the mesopores did not crystallize but became amorphous when the temperature decreased from 423 K, a value above the fusion point in the bulk, at 1 K min–1. Subsequently, as the temperature increased at 1 K min–1, the amorphous cold-crystallized and then fused around 320–360 K. If the temperature decreased from around the fusion point in the mesopores at the same cooling rate, erythritol inside the mesopores become a crystal. The XRD pattern of the erythritol inside the mesopores exhibited the crystal structure at 353 K, suggesting that the crystal grew around the nuclei of crystal. The heterogeneity of mesopores induces partial crystallization or partial melting, resulting in smooth phase transition. However, because the relaxation time of dynamic properties of erythritol confined in mesopores becomes longer du...
Published Version
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