Fluorinated silica microchannel surfaces

United States Patent

March 15, 2005
View the Complete Patent at the US Patent & Trademark Office
Microfluidic Polymer Valves
A method for surface modification of microchannels and capillaries. The method produces a chemically inert surface having a lowered surface free energy and improved frictional properties by attaching a fluorinated alkane group to the surface. The coating is produced by hydrolysis of a silane agent that is functionalized with either alkoxy or chloro ligands and an uncharged C.sub.3 -C.sub.10 fluorinated alkane chain. It has been found that the extent of surface coverage can be controlled by controlling the contact time from a minimum of about 2 minutes to a maximum of 120 minutes for complete surface coverage.
Kirby; Brian J. (San Francisco, CA), Shepodd; Timothy Jon (Livermore, CA)
Sandia Naitonal Laboratories (Livermore, CA)
September 16, 2002
B05D 5/08 (20060101); B05D 3/02 (20060101); G01F 003/08 ();
428/375,601 96/1 204/157.15,450 427/115 73/253
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.