NDLI: Width-Modulated Microfluidic Columns for Gas Separations

Content Provider	IEEE Xplore Digital Library
Author	Shakeel, H. Dong Wang Heflin, J.R. Agah, M.
Copyright Year	2001
Abstract	Microgas chromatography separation columns typically employ channels with fixed cross sections. In this paper, we demonstrate a new class of unidirectional microfabricated width-modulated columns (μWMC) that afford improved chromatographic efficiency, resolution, and retention times compared with corresponding constant width (120 μm) bidirectional columns. Two new μWMCs architectures are introduced: a linearly variable column (LVC) and a stepgradient column (SGC). The width of a 1-m long, 250-μm-deep LVC is gradually reduced from 120 to 20 μm at 1 μm/cm. While that of a 1-m-long SGC is modulated in five steps (120, 95, 70, 45, and 20 μm) each with a length of 20 cm. The effect of inlet selection (120 or 20 μm) on chromatographic performance is also evaluated. Moreover, with our improved fabrication process, multiple serially connected devices are simultaneously coated for the first time with highly stable silica nanoparticles utilizing layer-by-layer technique enabling constant film thickness.
Sponsorship	IEEE Sensors Council
Starting Page	3352
Ending Page	3357
Page Count	6
File Size	1536723
File Format	PDF
ISSN	1530437X
Volume Number	14
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coatings Films Silicon compounds Sensors Mobile communication Bonding silica nanoparticles Micro gas chromatography width-modulated micro columns
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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