“…The electroosmotic flow in a capillary tube exhibits capillary electrophoresis 1,2 and capillary electrochromatography 3,4 properties, and laminar flow conditions enable hydrodynamic chromatography. 5,6 Recently, it was reported that, when a ternary solvent mixture of water-hydrophilic/hydrophobic organic solvent is fed into a microspace under laminar flow conditions, the mixture solvents are radially distributed in the microspace.…”