Atmospheric Sulfuric Acid-Dimethylamine Nucleation Enhanced by Trifluoroacetic Acid

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Lu , Y , Liu , L , Ning , A , Yang , G , Liu , Y , Kurten , T , Vehkamäki , H , Zhang , X & Wang , L 2020 , ' Atmospheric Sulfuric Acid-Dimethylamine Nucleation Enhanced by Trifluoroacetic Acid ' , Geophysical Research Letters , vol. 47 , no. 2 , ARTN e2019GL085627 . https://doi.org/10.1029/2019GL085627

Title: Atmospheric Sulfuric Acid-Dimethylamine Nucleation Enhanced by Trifluoroacetic Acid
Author: Lu, Yiqun; Liu, Ling; Ning, An; Yang, Gan; Liu, Yiliang; Kurten, Theo; Vehkamäki, Hanna; Zhang, Xiuhui; Wang, Lin
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2020-01-28
Language: eng
Number of pages: 7
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
URI: http://hdl.handle.net/10138/322345
Abstract: Sulfuric acid (SA)-dimethylamine (DMA)-H2O cluster formation has been proven to be responsible for a significant part of new particle formation (NPF) in a Chinese megacity. However, the possible involvement of common atmospheric acids in the subsequent growth of SA-DMA clusters remains elusive. We simulated formation and growth of clusters using atmospheric relevant concentrations of SA, DMA, and trifluoroacetic acid (TFA), a commonly observed atmospheric perfluorocarboxylic acid, using Density Functional Theory combined with Atmospheric Cluster Dynamics Code. The presence of TFA leads to complex cluster formation routes and an enhancement of NPF rates by up to 2.3 ([TFA] = 5.0 x 10(6) molecules cm(-3), [SA] = 1.0 x 10(6) molecules cm(-3), and [DMA] = 1.5 x 10(9) molecules cm(-3)). The agreement of (SA)(1)center dot(DMA)(1-2)center dot(TFA)(1) concentrations between simulations and ambient measurements during NPF events validates model predictions and implies that perfluorocarboxylic acids could potentially boost atmospheric SA-DMA NPF rates.
Subject: nucleation
new particle formation
cluster
sulfuric acid
dimethylamine
trifluoroacetic acid
PARTICLE FORMATION
RESOLUTION
AMINES
DEGRADATION
STATES
CHINA
WATER
BASE
116 Chemical sciences
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