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Castable three-dimensional stationary phase for electric field-driven applications

United States Patent

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7,488,407
February 10, 2009
View the Complete Patent at the US Patent & Trademark Office
Microfluidic Devices
A polymer material useful as the porous dielectric medium for microfluidic devices generally and electrokinetic pumps in particular. The polymer material is produced from an inverse (water-in-oil) emulsion that creates a 3-dimensional network characterized by small pores and high internal volume, characteristics that are particularly desirable for the dielectric medium for electrokinetic pumps. Further, the material can be cast-to-shape inside a microchannel. The use of bifunctional monomers provides for charge density within the polymer structure sufficient to support electroosmotic flow. The 3-dimensional polymeric material can also be covalently bound to the channel walls thereby making it suitable for high-pressure applications.
Shepodd; Timothy J. (Livermore, CA), Whinnery, Jr.; Leroy (Danville, CA), Even, Jr.; William R. (Livermore, CA)
Sandia Corporation (Livermore, CA)
10/969,134
October 19, 2004
204/600 ; 204/450;
G01N 27/00 (20060101);
204/600,601,605,450,451,455
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.