Abstract
Drawn by capillary forces the developing solvent (mobile phase) migrates through the thin layer (stationary phase) over a defined distance. During this process the sample is separated into fractions. In TLC the flow velocity of solvent is inversely related to the distance migrated by the solvent front. For this reason classical TLC is time-consuming and usually of low chromatographic efficiency. To improve the separation selectivity suitable transverse alternating electric fields have been used to modify the mobile phase front velocity and the migration distance of solutes. In this paper, a vertical chromatographic chamber has been constructed and has been used to study experimentally the principles of planar dielectrochromatography, particularly the increase of the mobile phase front velocity and of the dielectrophoretic force generated at granule level on alumina plates. The equicurrent and countercurrent arrangements of armatures were taken into consideration. Good results were obtained in the counterc...
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