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

P.A.J. Donkers, S. Beckert, L. Pel, F. Stallmach, M. Steiger, O.C.G. Adan

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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.

Original languageEnglish
Pages (from-to)28711-28720
Number of pages10
JournalJournal of Physical Chemistry C
Issue number52
Publication statusPublished - 31 Dec 2015


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