Hydrated K2SO4·2MgSO4 structure revealed by TGA/DTA and magic-angle spinning 1H-NMR spectroscopy |
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Authors: | J ZHANG P A SMITH G R GOLCAR L-Q WANG J G DARAB |
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Affiliation: | (1) Chemical Separations and Slurry Processing Group, Pacific Northwest National Laboratory, Richland, WA 99352, USA |
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Abstract: | The hydration of K2SO4·2MgSO4 as a function of water addition was examined by pore-size distribution, thermo-gravimetric analysis/differential thermal
analysis and nuclear magnetic resonance (NMR) spectroscopy. Thermal studies indicated that the dehydration reactions occur
within three distinct temperature regimes which correspond to different degree of hydrogen bonded water or water in different
pore-size environments. Solid NMR studies resolved three different proton peaks at each water loading, that represent different
chemical environments around water, and also the different range of hydrogen bonding strengths. Therefore, the different chemical
environments associated with pore size around water are key factors influencing the NMR spectra. Both thermal and NMR studies
suggested that pore size affects the molecular interactions between water and water, and water and the substrate. Also X-ray
diffraction studies identified the presence of three phases existing in the hydrated products after the hydration reaction.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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