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A pressure programmable gas chromatography microsystem utilizing motionless Knudsen pump, fiber-integrated optical detector, and silicon micromachined separation column

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5 Author(s)
Jing Liu ; Eng. Res. Center for Wireless Integrated Microsyst., Univ. of Michigan, Ann Arbor, MI, USA ; Gupta, N.K. ; Xudong Fan ; Wise, K.D.
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This paper describes a micro gas chromatography (μGC) system that utilizes three miniaturized components. An optical fiber-based detector is used to monitor the elution peaks of different chemical species through a 25 cm long micromachined separation column. A motionless gas pump based on thermal transpiration is used to transport the analytes in the μGC. Simple pressure programming allows rapid analysis (<;5 min) without compromising the resolution of the lighter analytes. For example, the μGC system is operated at a pumping pressure head of 10.5 kPa for 35 sec to separate lighter analytes (pentane, heptane, and octane); the pumping pressure head is then ramped up to 21.6 kPa to allow rapid detection of heavier analytes (decane, and undecane).

Published in:

Solid-State Sensors, Actuators and Microsystems Conference (TRANSDUCERS), 2011 16th International

Date of Conference:

5-9 June 2011