Electrospray emitter coated with material of low surface energy

Details Electrospray emitter coated with material of low surface energy Electrospray emitter coated with material of low surface energy

2007-03-06

2007-03-06

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S281000, C250S282000

Reexamination Certificate

active

11219009

ABSTRACT:
This invention relates to an electrospray emitter which comprises an emitter body comprising an inlet orifice, an outlet orifice and a channel connecting the inlet orifice and the outlet orifice; and a coating formed at least on the outer surface of the exit end of the emitter body with a material of low surface energy. The emitters can produce stable electrospray without the aid of any nebulizing gas in the flow rate range of micro-to nano-liters, depending on the surface tension of solvent including distilled water with a high surface tension. The electrically non-conductive nature of their tips virtually eliminates electrical discharge and allows stable electrospray in the negative ion mode. To prevent loss of analytes during delivery between the emitter and analytical devices, e.g., liquid chromatography, a method of coating the inner surface of the connecting line with chemically inert material of low surface energy is also described.

REFERENCES:
patent: 6397838 (2002-06-01), Zimlich et al.
patent: 6796303 (2004-09-01), Zimlich et al.
patent: 2001/0001452 (2001-05-01), Davis
patent: 0 566 022 (1993-10-01), None
patent: 1 254 725 (2002-11-01), None
patent: WO 01/50820 (2001-07-01), None
patent: WO 01/94907 (2001-12-01), None
patent: WO 02/30486 (2002-04-01), None

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