American Association for Aerosol Research - Abstract Submission

AAAR 38th Annual Conference
October 5 - October 9, 2020

Virtual Conference

Abstract View


Surfactant Effects on Hanging Droplet Aqueous-Phase Aerosol Mimic Direct Photochemistry

Thomas Beier, JOSEPH WOO, Lafayette College

     Abstract Number: 319
     Working Group: Aerosol Chemistry

Abstract
Carbonyl-containing volatile organic compounds (CVOCs) have been demonstrated to exhibit a significant fraction of water-soluble organic carbon in aqueous aerosols and droplets, and are known to exhibit compositional changes under both dark and irradiated conditions. While condensed-phase photochemistry is often assumed to uniformly occur within a given phase, recent work has suggested that surfactant species in droplets may strongly react at the gas-liquid interface in hanging droplets. The prevailing bulk droplet chemistry may or may not be affected by the presence of a reactive surface. This study explores the direct photochemistry of aged glyoxal/ammonium-sulfate aerosol mimics, a non-surfactant CVOC aqueous reaction system, in the presence of additional non-reactive (sodium dodecyl sulfate ) and reactive (nonanoic acid) surfactant compounds. UV/visible absorbance and dynamic surface tension measurements for small (10µL), RH-controlled mimic droplets are presented.