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Investigate the solubility, diffusion kinetics, and structural incorporation of water into vitreous silica glass at elevated temperatures.

Water in silica glass

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Experimental study demonstrates water diffusion and hydroxyl formation kinetics in silica glass, highlighting molecular incorporation mechanisms.

Investigate the solubility, diffusion kinetics, and structural incorporation of water into vitreous silica glass at elevated temperatures.
Exposed silica glass specimens to controlled water vapor atmospheres across elevated temperatures.
Measured penetration depth and concentration profiles of hydroxyl groups using infrared absorption spectroscopy.
Hydroxyl solubility is proportional to the square root of water vapor pressure, indicating that molecular water dissociates to form pairs of hydroxyl groups attached to the silica network.
Water migration through vitreous silica is governed by activated diffusion, yielding quantitative diffusion coefficients that increase predictably with temperature.

Moulson et al. (1961) studied this question.

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Experimental study demonstrates water diffusion and hydroxyl formation kinetics in silica glass, highlighting molecular incorporation mechanisms.