Nao Kameno, N. Koga
Apr 4, 2018
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Influential Citations
14
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Journal
Journal of Physical Chemistry C
Abstract
The thermal dehydration of sodium thiosulfate pentahydrate (STS-PH), which has been studied as a potential thermal energy storage material, was investigated from the points of view of the physicogeometric reaction mechanism, heterogeneous kinetics, and morphologies of the product. Thermoanalytical and microscopy techniques were used to demonstrate the physicogeometric events that control the apparent kinetics of the reaction under different reaction conditions. The thermal dehydration of STS-PH takes place via a two-step reaction that involves a dihydrate intermediate, and the contribution of the melting of STS-PH is a key characteristic. Reaction conditions alter the relative position of the melting of STS-PH with reference to the reaction stage of the thermal dehydration. Depending on the relative position of STS-PH melting, the reaction can occur in the solid state, solid–liquid state, or liquid state. A variety of physicogeometric events contribute to the reaction processes under different reaction co...