Capillary zone electrophoresis (CZE) is an electrophoretic separation technique using an electrolyte-filled capillary. When an electric field is applied across the capillary, ionic species migrate towards the oppositely charged electrode with a linear velocity depending on the electrophoretic mobility of the species in the electrolyte. Because of their solvation, the ion movement drags the bulk solution in the capillary towards the cathode resulting in an electroosmotic flow.