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Method of making tapered capillary tips with constant inner diameters

United States Patent

February 17, 2009
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
Methods of forming electrospray ionization emitter tips are disclosed herein. In one embodiment, an end portion of a capillary tube can be immersed into an etchant, wherein the etchant forms a concave meniscus on the outer surface of the capillary. Variable etching rates in the meniscus can cause an external taper to form. While etching the outer surface of the capillary wall, a fluid can be flowed through the interior of the capillary tube. Etching continues until the immersed portion of the capillary tube is completely etched away.
Kelly; Ryan T. (West Richland, WA), Page; Jason S. (Kennewick, WA), Tang; Keqi (Richland, WA), Smith; Richard D. (Richland, WA)
Battelle Memorial Institute (Richland, WA)
11/ 394,840
March 31, 2006
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Contract DE-AC0576RLO1830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.