Abstract
Near infrared (NIR) spectroscopy has been used for the investigation of porous glass (PG), kinetics of the molecules, adsorption in it, particularly organic substances such as carbon tetrachloride, ethanol, acetone and p-xylene. NIR spectroscopy is quite a sensitive method because it permits to detect small part of monomolecular layer that was adsorbed on the plane surface. PG is a good adsorptive material owing to the existence of quasi-free OH-groups. It was found that adsorption of gas molecules on the surface of PG changes its optical spectrum in two ways: (i) it shifts OH-spectral lines (the value of spectral displacement Δ ω depends upon adsorptive energy); (ii) changes of spectrum are due to mechanical and electrooptical inharmonic features of molecule–OH bond that leads to the appearance of combination frequencies. Calculations were carried out for gas diffusion process in PG taking into account adsorption of molecules: relaxation constant (1/ t) depends upon diffusion coefficient ( D), element thickness ( d) and adsorption coefficient ( k).
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