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Title:Development of a micro-FID using a diffusion flame
Author(s):Kim, Jihyung
Advisor(s):Shannon, Mark A.
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):micro flame ionization detector
Abstract:A micro-flame ionization detector (micro-FID) was developed operating with a diffusion flame with a folded flame structure. Unlike conventional FIDs, an air-hydrogen diffusion flame was developed and tested in an encapsulated structure of Quartz-Macor®-Quartz layers. Diffusion flames are generally known to be more controllable and stable than premixed flames, which fits our purpose for the micro-FID, where the stability plays an important role for many applications. Various Macor designs including a burner cavity and a micro-channel were tested to obtain highest output sensitivity over methane test samples. In order to gauge sensitivity of the device, collected electric charge per mole (C/mol) was calculated and taken as a reference value of ionization efficiency. The result was 1.959x10-2 C/mol for methane which was about 34 times higher compared to the result obtained using a counter-flow flame, which was 5.73x10-4 C/mol for methane, while one of the commercial macro FIDs has 10-1 C/mol. This result shows that the micro-FID using the folded flame structure enhances ionization with less leakage of the analytes than the classical counter-flow flame design.
Issue Date:2011-08-26
Rights Information:Copyright 2011 Jihyung Kim
Date Available in IDEALS:2013-08-27
Date Deposited:2011-08

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