Summary
The surface properties of three silica-based reversed phases have been studied by inverse gas chromatography. Theoretical deduction indicates that there is a linear relationship between the molar deformation polarisation of the test solute (PD) and the dispersive interaction energy between the solute and the C18 and non-bonded silica surfaces. The specific interaction energy between the solute molecule and the silica surface (-ΔGSP) can be measured as the vertical distance between the solute experimental retention data point (RTlnVN) and the n-alkane RTlnVN vs PD calibration line. From multiple regression analysis of-ΔGSP data with proton acceptor solubility parameter {ie290-1} and orientation solubility parameter {ie290-2} as variants, two coefficients can be obtained related to the influence of the residual silanol groups and the trace metal impurities.
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Liu, G., Xin, Z. The study of reversed phases by inverse gas chromatography. Chromatographia 42, 290–294 (1996). https://doi.org/10.1007/BF02290311
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DOI: https://doi.org/10.1007/BF02290311