Planar micromachined valve and thermal desorber

Details Planar micromachined valve and thermal desorber Planar micromachined valve and thermal desorber

2007-01-31

2010-10-19

Greene, Jason M (Department: 1797)

Gas separation: apparatus

Solid sorbent apparatus

With means regenerating solid sorbent

C073S863120, C073S863730, C251S129010, C422S088000

Reexamination Certificate

active

07815722

ABSTRACT:
This invention provides a pre-concentrator device including an electrostatically operated valve and an electrically heated desorber, the electrostatically operated valve comprising a movable flap or membrane carrying a chemically adsorbing coating, suspended by an elastic element above an orifice in an insulated substrate. The device is constructed by planer processing. The flap or membrane can be deflected towards the substrate to block the flow of gas through the orifice by applying a voltage between the substrate and the membrane. The coating provides an adsorbing surface for a volatile organic compound. The coating may be heated electrically, by applying an alternating voltage between the substrate and the flap, thermally desorbing any adsorbed chemical species. When combined with other similar valves in a stacked assembly, the device may be used in a chemical pre-concentrator with very low dead volume.

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