Room temperature solid surfaces water with tetrahedral jumps of (super 2)H nuclei detected in (super 2)H(sub 2)O-hydrated porous silicates

Article Abstract:

(Super 2)H NMR techniques and calorimetry were used to investigate the nature of water adjacent to solid surfaces in kanemite, rehydrated zeolite A, rehydrated highly porous glass, rehydrated high surface area silica gel, and the hydration products of tricalcium silicate. Heat evolution observed during hydration of all samples was found to be consistent with the heat of fusion expected for a liquid to solid phase transition for the surface water.

Water, Chemical properties, Atomic nuclei

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A neutron scattering and nuclear magnetic resonance study of the structure of GeO2-P2O5

Article Abstract:

Germanophosphate (GeO2-P2O5) glasses are studied with neutron diffraction, phosphorus, and oxygen nuclear magnetic resonance, calorimetry, viscosity measurements, and first-principles calculations. The structural model is then used to propose explanations for both the observed composition dependence of the glass transition temperature and the fragility of he GeO2-P2O5 liquids.

Analysis, Neutrons, Phosphates, Optical properties, Viscosity, Thermal properties, Magnetic properties, Calorimetry, Neutron scattering

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Preferential binding of fluorine to aluminum in high peralkaline aluminosilicate glasses

Article Abstract:

NMR spectroscopy is used for understanding the structural changes introduced by the addition of alkali fluorides for two series of aluminosilicate glasses of high peralkaline type. The analysis has shown that the formation of the nonframework Al-F bonds is responsible for structural relaxation, which is shown by the reduction of the glass transition temperature.

Aluminum Compounds, Usage, Nuclear magnetic resonance spectroscopy

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