Abstract

The adsorption phenomenon of neutral particles in a sample having the shape of a slab is theoretically investigated by using a particular form for the kinetic equation at the limiting surfaces. The time evolution of the bulk and surface densities is determined in a closed form by means of a simple expression. A discussion on the characteristic times entering in the problem is reported. Finally, a microscopic model giving rise to a kinetic equation similar to the one used in the analysis is proposed, and the phenomenological parameters determined. The analysis is suitable for the description of the adsorption phenomena of dyes in nematic liquid crystals.

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