Basic Information
Abstract Number: 4500-200    
Author Name: Andrea L Elstro Affiliation: University of Michigan
Session Title: Solutions in Gas Chromatography
Event Type: Poster
Event Title: Temperature Programming and Programmable Selectivity with Silicon Micro-Fabricated GC Columns
Presider(s):   Start Time: ( Slot # 2 )
Date: 03/08/2004 Location:
Keywords: GC Columns, Environmental Analysis, Chromatography

Co-Authors
NameAffiliation
Lambertus, Gordon RUniversity of Michigan
Sacks, Richard DUniversity of Michigan
Sensenig, Kathryn AUniversity of Michigan
Whiting, Joshua JUniversity of Michigan

Abstract Content
A completely micro-fabricated GC system is under development at the University of Michigan as part of an NSF engineering research center for the development of wireless integrated micro systems (WIMS). Micro-fabricated columns are created by etching a channel into a silicon substrate that is 3-meters long and has internal dimensions of 245 µm by 150 µm. The silicon channels are boron doped for direct resistive heat for high-speed temperature programming. Temperature sensors for temperature measurement and control are fabricated in the column chip. A glass cover is anodically bonded to form a gas tight seal. Micro-columns are dynamically coated with a non-polar dimethyl polysiloxane coating or a moderately polar trifluoropropylmethyl polysiloxane coating and are then tested for column integrity and efficiency. Temperature sensors are tested to determine their reproducibility and accuracy. Each column was tested in air and hydrogen. Chromatograms will be presented illustrating temperature-programmed separations. A series coupled dual column system containing one polar and one non-polar column with a stop flow pressure control at the junction will be used to enhance the separation of targeted component pairs. Additional selectivity enhancement will be achieved by the use of independent heating of the two columns. Design and performance data will be presented for the dual-column ensemble using ambient air as carrier gas and vacuum-outlet operation.