Abstract

Spin probe and spin label methods were applied in studies of the fine structure of both reversed-phase and functionalized modified silicas. The concept of a “rigid” structure for narrow-pore alkyl-modified silicas was experimentally supported. “Two-level” sorption of the solute in the bonded layer of end-capped alkyl-modified silicas was discovered. The stability of arch structures arising in the bonded layer of functionalized modified silicas was studied. It was shown that arch structures could be effectively destroyed in solvents with high basicity.

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