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Variable control of electroosmotic and/or electrophoretic forces within a fluid-containing structure via electrical forces

  • US 5,965,001 A
  • Filed: 07/03/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 07/03/1996
  • Status: Expired due to Term
First Claim
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1. A microfluidic system comprisinga substrate having a plurality of interconnected capillary channels;

  • a plurality of electrodes at different nodes of said capillary channels for creating electric fields in said capillary channels to move materials electrokinetically in a fluid through said capillary channels;

    a power supply connected to at least one of said electrodes, said power supply further comprisinga mixing block having a first input terminal for receiving a controllable reference voltage and a second input terminal, said mixing block responding to a sum of voltages on said first and second input voltages, and an output terminal;

    a voltage amplifier connected to said mixing block output terminal, said voltage amplifier having first and second output terminals, said first output terminal connected to said at least one electrode; and

    a feedback block connected to said first output terminal of said voltage amplifier, said feedback block having an output terminal connected to said second input terminal of said mixing block so that negative feedback is provided to stabilize said power supply.

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