Abstract
Colloidal silica sol-based porous films were deposited onto circular glass disc of soda lime silica by the spinning technique (RPM range, 3500–5500) and cured in air and hydrated ammonia atmospheres at ambient temperature for about 20 days. In both cases, the film shrinkage with time was observed initially, followed by little swelling and compression on further ageing the films. These observations were reflected in the evaluated physical thickness and R.I. values. The porosity of the films was in accordance to their R.I. values. The stretching frequency due to –OH group of chemisorbed hydrated ammonia changed significantly with ageing of the films.
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