10th International Aerosol Conference
September 2 - September 7, 2018
America's Center Convention Complex
St. Louis, Missouri, USA

Abstract View


Measuring Thermodenuder Efficacy for Model Black Carbon Systems with Non-Absorbing Coatings

JAMES RADNEY, Christopher Zangmeister, National Institute of Standards and Technology

     Abstract Number: 954
     Working Group: Instrumentation

Abstract
Thermodenuders have become a gold standard in aerosol research for trying to remove coatings from black carbon particles (BC). Thermodenuders operate, in principle, by evaporating coatings from a non-refractory BC core in a flowing air stream with the concomitant scrubbing of the evaporated material by an activated carbon matrix. These systems are heavily used for the for the determination of the native BC and/or non-volatile components’ physical, chemical and optical properties. Here, we investigate the removal efficacy – defined as the ability to return the BC particles to their native (uncoated) mass and optical cross sections (extinction and absorption) – of model coatings (salts and organic liquids of varying volatility) as a function of particle size and BC mixing ratio.