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Sensors (Basel)

Title:		Development of Open-Tubular-Type Micro Gas Chromatography Column with Bump Structures
Author(s):		Lee J; Lim SH;
Address:		"Department of Mechanics and Design, Kookmin University, Seoul 02707, Korea. School of Mechanical Engineering, Kookmin University, Seoul 02707, Korea. shlim@kookmin.ac.kr"
Journal Title:		Sensors (Basel)
Year:		2019
Volume:		20190826
Issue:		17
Page Number:		-
DOI:		10.3390/s19173706
ISSN/ISBN:		1424-8220 (Electronic) 1424-8220 (Linking)
Abstract:		"Gas chromatography (GC) is the chemical analysis technique most widely used to separate and identify gas components, and it has been extensively applied in various gas analysis fields such as non-invasive medical diagnoses, indoor air quality monitoring, and outdoor environmental monitoring. Micro-electro-mechanical systems (MEMS)-based GC columns are essential for miniaturizing an integrated gas analysis system (Micro GC system). This study reports an open-tubular-type micro GC (mu-GC) column with internal bump structures (bump structure mu-GC column) that substantially increase the interaction between the gas mixture and a stationary phase. The developed bump structure mu-GC column, which was fabricated on a 2 cm x 2 cm mu-GC chip and coated with a non-polar stationary phase, is 1.5 m-long, 150 mum-wide, and 400 mum-deep. It has an internal microfluidic channel in which the bumps, which are 150 mum diameter half-circles, are alternatingly disposed to face each other on the surface of the microchannel. The fabricated bump structure mu-GC column yielded a height-equivalent-to-a-theoretical-plate (HETP) of 0.009 cm (11,110 plates/m) at an optimal carrier gas velocity of 17 cm/s. The mechanically robust bump structure mu-GC column proposed in this study achieved higher separation efficiency than a commercially available GC column and a typical mu-GC column with internal post structures classified as a semi-packed-type column. The experimental results demonstrate that the developed bump structure mu-GC column can separate a gas mixture completely, with excellent separation resolution for formaldehyde, benzene, toluene, ethylbenzene, and xylene mixture, under programmed operating temperatures"
Keywords:		Mems bump structures gas chromatography separation column volatile organic compounds;
Notes:		"PubMed-not-MEDLINELee, Janghyeon Lim, Si-Hyung eng 2017M3A7B4041987/National Research Foundation of Korea/ 2015M3A9E2029267/National Research Foundation of Korea/ Switzerland 2019/08/29 Sensors (Basel). 2019 Aug 26; 19(17):3706. doi: 10.3390/s19173706"