Liquid crystals as stationary phases in gas chromatography

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Abstract Previously various aspects of adsorption phenomena in electric field liquid crystal (EF-LC) columns were investigated. In this study, to establish the mechanism of the phenomenon, the amounts of C 4 and C 5 aliphatic alcohols and esters adsorbed were measured on three types of EF-LC columns, and the effects of the dielectric constants and the carbon skeleton structures of the solutes on the amounts adsorbed were determined. It was found that the amounts of isomers such as pentanols and butanols adsorbed were different from each other, although these isomers have similar dielectric constants. It was concluded that the adsorption was influenced not only by the dielectric constant, but also by the structure of the carbon skeleton. The equation proposed previously for the relationship between the field strength and the extent of adsorption was modified by introducing a structural term, f s . Subsequently, the dielectric constants of esters were calculated from the equation by using the f s values of the corresponding alcohols, and were compared with those found in the literature. The differences were within 10%.

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