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

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