Pore Structure of Chemically Modified Silica Gels Determined by Exclusion Chromatography

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Abstract
It will be demonstrated that the determination of pore structures of chemically modified silica gels is possible by simple chromatographic measurements. Silica gels with different mean pore diameters (60–300Å) have been modified by bonding silanes to their surface. Silanes with different alkyl chain lengths and different functional end groups have been used. The pore size distributions of the resulting stationary phases have been determined by exclusion chromatography. Due to the chemical reaction the total pore volume is decreased, greater pores disappear, and smaller pores are formed. The chemical bonded layer might be considered as a uniform coating with a thickness considerably smaller than the extended chain length of the silanizing reagent.

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