Water Transport in MgSO4·7H2O During Dehydration in View of Thermal Storage

Water Transport in MgSO4·7H2O During Dehydration in View of Thermal Storage

The water phases in a MgSO4·7H2O crystal during heating were studied with the help of NMR. The thermogravimetric analysis (TGA) data showed that the heating rate has a strong effect on the dehydration process. NMR experiments showed that pore water, i.e., an aqueous solution of MgSO4, was produced d...

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Bibliographic Details
Published in:Journal of physical chemistry. C Vol. 119; no. 52; pp. 28711 - 28720
Main Authors: Donkers, P. A. J, Beckert, S, Pel, L, Stallmach, F, Steiger, M, Adan, O. C. G
Format: Journal Article
Language:English
Published: American Chemical Society 31-12-2015
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Summary:The water phases in a MgSO4·7H2O crystal during heating were studied with the help of NMR. The thermogravimetric analysis (TGA) data showed that the heating rate has a strong effect on the dehydration process. NMR experiments showed that pore water, i.e., an aqueous solution of MgSO4, was produced during dehydration. Additional NMR measurements indicate a water diffusion coefficient of this pore water that is 10 times lower than that of bulk water. We showed on the basis of a model that pore water is produced as the vapor release is not sufficient at crossing a phase transition temperature.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.5b08730