Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1993-01-22
1994-10-25
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
2041801, 2041821, C25B 900
Patent
active
053586182
ABSTRACT:
An electrophoretic separation apparatus includes a capillary tube having a length, a cross section, an inlet and an outlet. A first reservoir containing a solvent and, upon injection, a solute is in fluid-flow communication with the inlet and a second reservoir containing at least a solvent is also in fluid flow communication with the outlet, the capillary thereby being filled at least with the solvent. A first power supply means applies a separation potential between the first and second reservoirs and along the length of the capillary to thereby establish an electrophoretic flow of the solute therethrough. An electrically isolated conductor is juxtaposed to an external surface of the capillary tube and is connected to a second power supply. An electrostatic field is thereby applied across the cross section of the capillary tube to control the electroosmotic flow therein. The electrical isolation of the conductor prevents current flow between the power supply and the conductor. The conductor achieves effective electroosmotic flow control even though it extends only over a small portion of the length of the capillary tube.
REFERENCES:
patent: 5092972 (1992-03-01), Ghowsi
patent: 5151164 (1992-09-01), Blanchard et al.
"High Performance Electrophoresis, Elimination of Electroendosmosis and Solute Adsorption", Hjerten, Journal of Chromatography, 347 (1985) pp. 191-198.
"Analytical Chem.", Hayes et al., vol. 64, (1992) pp. 512-516.
"Capillary Electrophoresis", Ewing et al., Analytical Chemistry, 1989, vol. 61, 292A.
"Capillary Electrophoresis", Kuhr, Analytical Chemistry, 1990, vol. 62, 403R-414R.
"Direct Control of the Electroosmosis in Capillary Zone Electrophoresis by Using an External Electric Field", Lee et al., Analytical Chemistry, 1990, vol. 62, pp. 1550-1552.
Ewing Andrew G.
Hayes Mark A.
Kheterpal I.
Delacroix-Muirheid Cybille
Monahan Thomas J.
Niebling John
The Penn State Research Foundation
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