Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

Abstract

The selectivity of 4-(Decyloxy) benzoic acid (DBA) liquid crystal in surface adsorption region (303.2-328.2 K) and thermodynamic region (423.2 - 433.2 K) was investigated by inverse gas chromatography at infinite dilution (IGC-ID). The selectivity parameters of the structural isomer series named butyl acetate, butyl alcohol, and amyl alcohol series were calculated for the DBA using IGC-ID technique. Additionally, the surface properties including dispersive surface energy (gamma(D)(S)), free energy (Delta G(A)(S)), enthalpy (Delta H-A(S)), and acidity-basicity constants were calculated with net retention volumes obtained from IGC-ID experiment results. When the Delta H-A(S) and Delta G(A)(S) are constants, DBA surface was found to be an acidic character (K-D/K-A congruent to 0.89).