Abstract
Silica adsorbents with bonded C 16H 33, n-C 6F 13(CH 2) 3, tert.-C 6F 13(CH 2) 3 or n-C 3F 7(CH 2) 3 groups were prepared by the reaction between hydroxylated silica (Silochrome) and corresponding N-(organodimethylsilyl)morpholines. These adsorbents, as well as silica with bonded phenylpolysiloxane which was prepared by multilayer attachment of phenyltrichlorosilane, were investigated by means of gas chromatography at zero surface coverage. Thermodynamic functions (Gibbs energies, entropies and heats of adsorption) were shown to change significantly with chemical nature and structure of attached groups. On the basis of the investigation of the adsorption of cyclic compounds we proposed that the mechanism of interaction between non-polar organic compounds and silanized silicas is absorption to the bonded layer. Dispersive and specific components of intermolecular interaction in adsorption have been estimated by several techniques.
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