Abstract
The surface properties of controlled pore glass, silica gel and ordered mesoporous silica SBA-15 having different functional groups (hydroxyl, trimethylsilyl and aminopropyl) were investigated by inverse gas chromatography. The porous silicates were used as model system to study correlations between surface chemistry and surface energy by means of the IGC technique. The van Deemter equation was used for the determination of optimum carrier gas flow rate. The dispersive part of surface energy, the specific free energy of adsorption, acceptor–donor properties and heat of adsorption were determined from IGC experiments for an energetic characterisation of the porous materials. It is shown that different surface functional groups have an influence onto dispersive interactions with n-alkanes as well as onto the specific interactions with polar molecules.
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