Characterization of chemically modified silica gels by DRIFT spectroscopy

Abstract

Chemically modified silica gels are investigated with respect to identity, purity and degree of surface coverage using diffuse reflectance FTIR (DRIFT) spectroscopy. We report the results for two bonded HPLC phases, pyrene butyric acid propylamido-and octadecyl-groups grafted on irregular porous silica gel. For quantitative determination calibration standards are prepared by adsorbing structurally similar ligand compounds onto the surface of the silica gel; these coated materials give linear calibration curves up to a concentration of 1 mmol/g modified silica gel.