Chemistry: analytical and immunological testing – Nitrogen containing – Amine and quaternary ammonium
Patent
1997-01-31
1999-02-23
Le, Long V.
Chemistry: analytical and immunological testing
Nitrogen containing
Amine and quaternary ammonium
436106, 436110, 436153, 422 90, 422 98, 250423R, 250424, 250425, G01N 2762
Patent
active
058743146
ABSTRACT:
In a technique for detecting organic vapors and aerosols, e.g. of amines, hydrazines and nitrogen-containing compounds produced in combustion, molecules condense at a surface of a conductive device. By heating the conductive device in pulsed fashion, e.g. by resistance heating, condensed molecules are thermally ionized and emitted from the conductive device. Emitted ions are collected by a collector electrode, and the resulting ionic current pulse is amplified by a transimpedance circuit. The heat pulse lasts until the ionic current pulse has subsided, by which time the conductive device has become free of residual substances. As a result, the conductive device remains uncontaminated and has a long service life. The time-averaged power consumption of the technique is less than 2 mW. For resistance heating, a meander heater element can be disposed on a silicon nitride membrane across an etched opening in a silicon chip. A separate conductive surface layer can be included in the conductive device, separated from the heater element by an insulating layer.
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U. Kh. Rasulev et al., "Chromatography Determination of Trace Amounts of Amines Using a Surface Ionization Detector", Journal of Chromatography A, vol. 704, No. 2 (Jun. 9, 1995), pp. 473-482.
Loepfe Markus
Ryser Peter
Wieser Dieter
Cerberus AG
Le Long V.
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