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

Authors: BİROL IŞIK, FATİH ÇAKAR, HÜSNÜ CANKURTARAN, ÖZLEM CANKURTARAN

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 (γ _S^D), free energy (ΔG_A^S), enthalpy (ΔH_A^S), and acidity-basicity constants were calculated with net retention volumes obtained from IGC-ID experiment results. When the ΔH_A^S and ΔG_A^S are constants, DBA surface was found to be an acidic character (K_D/K_A ≅ 0.89).

Keywords: Inverse gas chromatography, liquid crystal, selectivity, surface properties

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