Micro-hollow glow discharge analysis of carbonaceous materials

Chethan K. Gaddam, Randy L. Vander Wal

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Combustion produced soot can vary widely in composition, in particular C/H ratio, reflecting both its molecular origins and temperature of evolution. In this study the main objective was to develop and demonstrate a micro-hollow glow discharge analyzer coupled to a miniature spectrometer for a variety of carbonaceous materials. Traditional sputtering capability of the glow discharge has been utilized for both atomizing and electronically exciting the samples for stand-alone analytical analysis. Analyzed samples included flame and diesel soot, biochars and a carbon black. Demonstrating versatility for chemistry analysis, the plasma detector could distinguish carbonaceous materials with different C/H ratios and recognize heteroelements, inorganics and metal elements from carbonaceous materials. For some operational regimes and species, emission from OH (A2+-X2∏), CH (A2Δ-X2∏), and often C2 (d3g-a3u; Swan band system) diatomic radicals is produced. Moreover the inherent oxygen content nascent to the carbonaceous material can be quantitatively estimated without any heat treatment, besides having the light element detection capability, in particular hydrogen.

Original languageEnglish (US)
Title of host publication8th US National Combustion Meeting 2013
PublisherWestern States Section/Combustion Institute
Number of pages8
ISBN (Electronic)9781627488426
StatePublished - 2013
Event8th US National Combustion Meeting 2013 - Park City, United States
Duration: May 19 2013May 22 2013

Publication series

Name8th US National Combustion Meeting 2013


Other8th US National Combustion Meeting 2013
Country/TerritoryUnited States
CityPark City

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Mechanical Engineering
  • Physical and Theoretical Chemistry


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