Porous polymers: compositions and uses thereof
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United States of America Patent
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Issued Date -
Dec 18, 2003
app pub date -
Jan 17, 2003
filing date -
Jan 18, 2002
priority date (Note) -
Abandoned
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Abstract
A composition, method and use is disclosed for a porous plug that functions as an electro-osmotic pump. The polymer eliminates any back pressure effects while enhancing the electro-osmotic flow in a channel. The pump is bach fabricated by surface micromachining on top of a silicon wafer. The pump device is driven by an alternating zero-average injected current signal at low frequencies producing a bubble-free electro-osmotic flow with a reversible net movement. The device is capable of an average water-air interface velocity of 1.8 .mu.m/second at 0.8 Hz. The velocity may be increased from between 4.8-13.9 .mu.m/second by necking down the channel size.
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