Abstract
High flow rate electroosmotic, EO, pumps are of great interest due to their simple design and non-moving parts. EO pumps were fabricated from two types of membranes: a never before tested, microcapillary array and the popular, anodic aluminum oxide (AAO). Flow rates and power consumption were measured directly for both membranes while efficiency was measured indirectly for the AAOs. A normalized flow rate of 1.90 mL/min/V/cm2 was recorded which is the highest normalized flow rate published. Large inefficiencies can occur due to electrolysis and electrode spacing and thus methods to decreasing these problems are discussed. Electroosmotic pumps were driven by constant voltage and asymmetric voltage pulses. The asymmetric voltage pulses negated electrolysis while producing a net flow. Voltage losses due to electrode spacing were minimized by platinum coatings.
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