A Microfluidic Device to Acquire Gaseous Samples Via Surface Tension Held Gas-Liquid Interface
Sridharamurthy, S.S.
Hongrui Jiang
Univ. of Wisconsin, Madison;
This paper appears in: Sensors Journal, IEEE
Publication Date: Sept. 2007
Volume: 7,
Issue: 9
On page(s): 1315-1316
ISSN: 1530-437X
INSPEC Accession Number: 9633399
Digital Object Identifier: 10.1109/JSEN.2007.901536
Current Version Published: 2007-07-23
Abstract
We present a relatively simple and effective method for acquiring gaseous samples into microfluidic channels. Hydrophobic polymers are photopatterned on hydrophilic substrates. Due to surface tension, aqueous liquid is confined by the hydrophobic polymers, but not completely blocked by a physical wall, thus allowing an interface for gas-liquid interaction. Here, the mechanism is demonstrated by using hydrophobic (poly)iso-bornyl acrylate polymer patterns on hydrophilic glass substrates, and through a Nessler's reagent-ammonia reaction that exhibits changes in color and electrical resistance.
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