Diffusion and Preferential Adsorption of Sol-Gel Glass

Abstract

Samples of porous glass of 38 Å average pore size are prepared with the use of the sol-gel technique. After stabilizing at 800°C, samples are impregnated with various binary mixtures and Raman spectroscopy is used to analyze the composition of the mixtures inside the pores. In order to study the effect of surface interaction on preferential adsorption, the experiments are repeated for samples of modified surfaces. It is shown that surface interactions are important and they determine the excess adsorption. The diffusion rate inside porous glass is also measured and it is shown to depend on surface interactions.