| Alcoholic solutions of silicon ethoxide (TEOS) were
ammonolysed with dry ammonia and the reactions led to
formation of amines, alcohol and silica sol. On ageing, the
sol gelled to a monolithic mass. The gels produced by the
non-aqueous route vitrified to clear silica glass in the temperature
range 1100°-l200°C, depending on the thickness
of the samples. The refractive index and density of the glass
were nearly the same as those for vitreous silica. |
