Electroosmotic (EO) pumps can drive electrolyte liquids with a wide range of conductivities and achieve significant pressures and flow rates in a compact design with no moving parts. These devices offer important advantages to more traditional pumping technologies in a variety of applications. For example, sample delivery and control of liquid streams is an important requirement in the development of so-called micro total analysis systems (microTAS) which aim to integrate multiple chemical analysis functions onto microfabricated chip systems. Other potential applications include...