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Abstract
A novel method had been developed to prepare ADS packings. Different alkyl-chains were bound onto Develosil60-5μ silica (particle size dp = 5 μm, s = 400–450m2/g) with γ-glycidoxypropy-ltrimethoxysilane as coupling agent and hydrophilic diol phase precursor. Characterization of the packings was carried out with elemental analysis, X-Ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared (FT-IR), solid-state 13C, and 29Si CP-MAS NMR. Chromatographic tests confirm the essence of the packings and RAS behavior.
ACKNOWLEDGMENTS
The authors thank professor Shihong Liu for his engagement in the surface determination with XPS. This work was supported by the National Natural Science Foundation of China, as well as the Chinese Academy of Sciences and 863 Project of China.