Low Voltage EO Pumping
Today I brought membranes and the streaming potential device to David Borkholder’s lab at RIT. His students and I set up an initial low voltage experiment. They will continue to test the device for flow rates and back pressures. Here is a list of methods and results from today:
- SC 214, RTPed but not oxidized, wrinkled
- Silver chloride ink was painted on twisted silver wires
- Flexible ~.5mm diameter capillaries were attached to inlet/outlet ports
- Electrode polarity was switched every 100s with an op amp circuit
- Slow, but noticeable fluid flow occurred at 700 mV/.2 mA
- We measured a flow rate of ~.6 μL/min at 1 V/.3 mA
- Flow switched every 100s, continued to work for ~15 min
- No bubbles at these voltages, no obvious degradation of silver wires


