Stanley D. Stookey

Water/glass reactions at elevated temperatures and pressures

Abstract Hydration behavior of two closely related glasses was studied as a function of temperature and percent saturation of steam in an autoclave atmosphere. Temperatures ranged from 225 to 350°C under steam pressures which varied from 56 to 100 percent of saturation. These glasses hydrated to give a sharp boundary layer, with H 2 O contents (wt %) up to 17.5%. The position of this boundary (penetration), weight gain per unit area, and water content of the hydrated layer, were determined as a function of time, temperature and saturation. Penetration rates in both compositions decreased with decreasing saturation and were relatively insensitive to temperature. Water contents (by LOI) increased within the hydrated layer with decreasing temperature. The implications of these findings with regard to process control are discussed.

Full-Colour (Polychromatic) Photosensitive Glass

AbstractA photochemical method is described for precipitating subcolloidal silver particles, having controlled variations in anisotropy, in a rigid glass matrix. Such particles, too small to scatter light, exhibit brilliant colours, covering the full visible spectrum.