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DOI	10.5194/acp-21-2179-2021
	Effect of mixing structure on the water uptake of mixtures of ammonium sulfate and phthalic acid particles
	Wang W.; Lei T.; Zuend A.; Su H.; Cheng Y.; Shi Y.; Ge M.; Liu M.
发表日期	2021
ISSN	1680-7316
起始页码	2179
结束页码	2190
卷号	21 期号:3
英文摘要	Aerosol mixing state regulates the interactions between water molecules and particles and thus controls aerosol activation and hygroscopic growth, which thereby influences visibility degradation, cloud formation, and its radiative forcing. There are, however, few current studies on the mixing structure effects on aerosol hygroscopicity. Here, we investigated the hygroscopicity of ammonium sulfate / phthalic acid (AS / PA) aerosol particles with different mass fractions of PA in different mixing states in terms of initial particle generation. Firstly, the effect of PA coatings on the hygroscopic behavior of the core-shell-generated mixtures of AS with PA was studied using a coating hygroscopicity tandem differential mobility analyzer (coating HTDMA). The slow increase in the hygroscopic growth factor of core-shell-generated particles is observed with increasing thickness of the coating PA prior to the deliquescence relative humidity (DRH) of AS. At relative humidity (RH) above 80 %, a decrease in the hygroscopic growth factor of particles occurs as the thickness of the PA shell increases, which indicates that the increase of PA mass fractions leads to a reduction of the overall core-shell-generated particle hygroscopicity. In addition, the use of the Zdanovskii–Stokes– Robinson (ZSR) relation leads to the underestimation of the measured growth factors of core-shell-generated particles without consideration of the morphological effect of coreshell-generated particles, especially at higher RH. Secondly, in the case of the AS / PA initially well-mixed particles, a shift of the DRH of AS (_ 80 %, Tang and Munkelwitz, 1994) to lower RH is observed due to the presence of PA in the initially well-mixed particles. The predicted hygroscopic growth factor using the ZSR relation is consistent with the measured hygroscopic growth factor of the initially wellmixed particles. Moreover, we compared and discussed the influence of mixing states on the water uptake of AS / PA aerosol particles. It is found that the hygroscopic growth factor of the core-shell-generated particles is slightly higher than that of the initially well-mixed particles with the same mass fractions of PA at RH above 80 %. The observation of AS / PA particles may contribute to a growing field of knowledge regarding the influence of coating properties and mixing structure on water uptake. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168758
作者单位	State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China; Minerva Research Group, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, QC, Canada; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
推荐引用方式 GB/T 7714	Wang W.,Lei T.,Zuend A.,et al. Effect of mixing structure on the water uptake of mixtures of ammonium sulfate and phthalic acid particles[J],2021,21(3).
APA	Wang W..,Lei T..,Zuend A..,Su H..,Cheng Y..,...&Liu M..(2021).Effect of mixing structure on the water uptake of mixtures of ammonium sulfate and phthalic acid particles.Atmospheric Chemistry and Physics,21(3).
MLA	Wang W.,et al."Effect of mixing structure on the water uptake of mixtures of ammonium sulfate and phthalic acid particles".Atmospheric Chemistry and Physics 21.3(2021).