Abstract
Two silica-zirconia composites with different silica molar ratio (3.4% and 15.8%, respectively) were prepared as rigid-micro spheres by means of a sol-gel process. Scan electron micrograph, X-rays diffraction, nitrogen adsorption, and potentiometric titration were used to characterize the silica-zirconia composites and, for the comparison, bare zirconia. Addition of the silica into the zirconia prevented the formation of monoclinic zirconia. The silica-zirconia composites show larger specific surface area and more ideal pore structure than the bare zirconia. The normal phase chromatographic performance was studied by using isopropanol/cyclohexane, dichloromethane/cyclohexane and chloroform/cyclohexane as mobile phases. Basic solutes gave symmetrical peaks, and the acidic solutes exhibited better peak shape on the composite stationary phases than on the bare zirconia.
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