| Title: | Demonstration of motionless Knudsen pump based micro-gas chromatography featuring micro-fabricated columns and on-column detectors |
| Author(s): | Liu J; Gupta NK; Wise KD; Gianchandani YB; Fan X; |
| Address: | "Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA" |
| ISSN/ISBN: | 1473-0189 (Electronic) 1473-0189 (Linking) |
| Abstract: | "This paper reports the investigation of a micro-gas chromatography (muGC) system that utilizes an array of miniaturized motionless Knudsen pumps (KPs) as well as microfabricated separation columns and optical detectors. A prototype system was built to achieve a flow rate of 1 mL min(-1) and 0.26 mL min(-1) for helium and dry air, respectively, when they were used as carrier gas. This system was then employed to evaluate GC performance compromises and demonstrate the ability to separate and detect gas mixtures containing analytes of different volatilities and polarities. Furthermore, the use of pressure programming of the KP array was demonstrated to significantly shorten the analysis time while maintaining a high detection resolution. Using this method, we obtained a high resolution detection of 5 alkanes of different volatilities within 5 min. Finally, we successfully detected gas mixtures of various polarities using a tandem-column muGC configuration by installing two on-column optical detectors to obtain complementary chromatograms" |
| Keywords: | "Chromatography, Gas/*instrumentation Microtechnology/*instrumentation Optical Phenomena Volatile Organic Compounds/chemistry;" |
| Notes: | "MedlineLiu, Jing Gupta, Naveen K Wise, Kensall D Gianchandani, Yogesh B Fan, Xudong eng Research Support, U.S. Gov't, Non-P.H.S. England 2011/08/27 Lab Chip. 2011 Oct 21; 11(20):3487-92. doi: 10.1039/c1lc20511k. Epub 2011 Aug 25" |
