Hygroscopic Characteristics of Alkylaminium Carboxylate Aerosols

Environmental Science & Technology
Mario Gomez-HernandezRenyi Zhang

Abstract

The hygroscopic growth factor (HGF) and cloud condensation nuclei (CCN) activity for a series of alkylaminium carboxylate aerosols have been measured using a hygroscopicity tandem differential mobility analyzer coupled to a condensation particle counter and a CCN counter. The particles, consisting of the mixtures of mono- (acetic, propanoic, p-toluic, and cis-pinonic acid) and dicarboxylic (oxalic, succinic, malic, adipic, and azelaic acid) acid with alkylamine (mono-, di-, and trimethylamines), represent those commonly found under diverse environmental conditions. The hygroscopicity parameter (κ) of the alkylaminium carboxylate aerosols was derived from the HGF and CCN results and theoretically calculated. The HGF at 90% RH is in the range of 1.3 to 1.8 for alkylaminium monocarboxylates and 1.1 to 2.2 for alkylaminium dicarboxylates, dependent on the molecular functionality (i.e., the carboxylic or OH functional group in organic acids and methyl substitution in alkylamines). The κ value for all alkylaminium carboxylates is in the range of 0.06-1.37 derived from the HGF measurements at 90% RH, 0.05-0.49 derived from the CCN measurements, and 0.22-0.66 theoretically calculated. The measured hygroscopicity of the alkylaminium car...Continue Reading

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Citations

Apr 20, 2017·Environmental Science & Technology·Geoffroy DuportéMarja-Liisa Riekkola
Jan 31, 2017·Physical Chemistry Chemical Physics : PCCP·Michelle C FairhurstBarbara J Finlayson-Pitts
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Nov 17, 2016·Proceedings of the National Academy of Sciences of the United States of America·Gehui WangMario J Molina
Jan 26, 2018·Environmental Science & Technology·Xiaolong FanAlexei Khalizov

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