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

doi:10.1021/acs.jpcc.5b08730

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

Transport in Permeable Media

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Abstract

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 language	English
Pages (from-to)	28711-28720
Number of pages	10
Journal	Journal of Physical Chemistry C
Volume	119
Issue number	52
DOIs	https://doi.org/10.1021/acs.jpcc.5b08730
Publication status	Published - 31 Dec 2015

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AU - Donkers, P.A.J.

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AU - Steiger, M.

AU - Adan, O.C.G.

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AB - 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.

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ER -

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

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