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

被引：59

作者：

Donkers, P. A. J. ^{[1
,2
]}

Beckert, S. ^{[3
]}

Pel, L. ^{[2
]}

Stallmach, F. ^{[4
]}

Steiger, M. ^{[5
]}

Adan, O. C. G. ^{[2
,6
]}

机构：

[1] Mat Innovat Inst M2i, NL-2628 XG Delft, Netherlands

[2] Tech Univ Eindhoven, NL-5600 MB Eindhoven, Netherlands

[3] Univ Leipzig, Inst Chem Technol, D-04103 Leipzig, Germany

[4] Univ Leipzig, D-04103 Leipzig, Germany

[5] Univ Hamburg, D-20146 Hamburg, Germany

[6] TNO Bldg & Construct Res, NL-2600 AA Delft, Netherlands

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2015年 / 119卷 / 52期

关键词：

SELF-DIFFUSION; MAGNESIUM; HEPTAHYDRATE; DENSITIES;

D O I：

10.1021/acs.jpcc.5b08730

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The water phases in a MgSO4 center dot 7H(2)O 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.

引用

页码：28711 / 28720

页数：10

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