An analytical model for electroosmotic flow rate, total pump current, and thermodynamic efficiency reported in a previous paper has been applied as a design guideline to fabricate porous-structure EO pumps. We have fabricated sintered-glass EO pumps that provide maximum flow rates and pressure capacities of 33 ml/min and 1.3 atm, respectively, at applied potential 100 V. These pumps are designe...

Electroosmotic flow (EOF) is one of the fundamental processes affecting both resolution and separation times in capillary zone electrophoresis (CZE). EOF is a function of pH and buffer composition (zeta potential) in bare-silica capillaries at any pH above 3 and runs in the cathodal direction, decreasing the effective separation length for cationic species. On the other hand, the absence of EOF...

The capillary/channel length is an important factor in capillary electrophoresis (CE) systems since it is directly related to the amount of separation attainable. In this work we present methods to increase the effective channel length without the need to modify the physical channel length. Using an electrode located close to the capillary surface it is possible to dynamically modify zeta-poten...