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Electrokinetic pumping

  • US 6,120,665 A
  • Filed: 02/18/1998
  • Issued: 09/19/2000
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method of changing the electrode-based pumping parameters of a liquid, the method comprising(a) providing an electrode-based pumping apparatus comprising a substrate, a channel of capillary dimensions located within the substrate, and two electrodes located within the channel and effective to pump liquid in the channel, wherein the electrodes are located within 2,500 μ

  • m of each other,(b) selecting a pumping additive based on the pumping pressure, pumping flow rate and electrical efficiency exhibited by the additive when pumped through the capillary by applying voltage across the two electrodes, and(c) mixing the pumping additive with the liquid to up to 10% w/w of mixture to obtain a mixture having either(i) improved pumping pressure, pumping flow rate or electrical efficiency, or(ii) having a preference for pumping in a direction opposite that of the liquid, in the absence of pumping additive.

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