Title :
A Microfluidic Device to Acquire Gaseous Samples Via Surface Tension Held Gas-Liquid Interface
Author :
Sridharamurthy, Sudheer S. ; Jiang, Hongrui
Author_Institution :
Univ. of Wisconsin, Madison
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.
Keywords :
microchannel flow; pattern formation; polymers; surface tension; Nessler´s reagent-ammonia reaction; color resistance; electrical resistance; gaseous samples; hydrophilic glass substrates; hydrophobic (poly)iso-bornyl acrylate polymer pattern; hydrophobic polymer; microfluidic channels; microfluidic device; surface tension held gas-liquid interface; Chemical and biological sensors; Contacts; Electric resistance; Fabrication; Glass; Indium tin oxide; Microfluidics; Polymers; Substrates; Surface tension; Gaseous sample acquisition; hydrophobic patterning; microfluidics; surface tension;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2007.901536
