气候变化领域集成服务门户(CCPortal): A single-parameter hygroscopicity model for functionalized insoluole aerosol surfaces

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DOI	10.5194/acp-22-13219-2022
	A single-parameter hygroscopicity model for functionalized insoluole aerosol surfaces
	Mao, Chun-Ning; Gohil, Kanishk; Asa-Awuku, Akua A.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13219
结束页码	13228
卷号	22 期号:19 页码:10
英文摘要	The impact of molecular level surface chemistry for aerosol water-uptake and droplet growth is not well understood. In this work, spherical, nonporous, monodisperse polystyrene latex (PSL) particles treated with different surface functional groups are exploited to isolate the effects of aerosol surface chemistry for droplet activation. PSL is effectively water insoluble and changes in the particle surface may be considered a critical factor in the initial water uptake of water-insoluble material. The droplet growth of two surface modified types of PSL (PSL-NH2 and PSL-COOH) along with plain PSL was measured in a supersaturated environment with a Cloud Condensation Nuclei Counter (CCNC). Three droplet growth models - traditional Kohler (TK), Flory-Huggins Kohler (FHK) and the Frenkel-Halsey-Hill adsorption theory (FHH-AT) were compared with experimental data. The experimentally determined single hygroscopicity parameter, kappa, was found within the range from 0.002 to 0.04. The traditional Kohler prediction assumes Raoult's law solute dissolution and underestimates the water-uptake ability of the PSL particles. FHK can be applied to polymeric aerosol; however, FHK assumes that the polymer is soluble and hydrophilic. Thus, the FHK model generates a negative result for hydrophobic PSL and predicts non-activation behavior that disagrees with the experimental observation. The FHH-AT model assumes that a particle is water insoluble and can be fit with two empirical parameters (A(FHH) and B-FHH). The FHH-AT prediction agrees with the experimental data and can differentiate the water uptake behavior of the particles owing to surface modification of PSL surface. PSL-NH2 exhibits slightly higher hygroscopicity than the PSL-COOH, whereas plain PSL is the least hygroscopic among the three. This result is consistent with the polarity of surface functional groups and their affinity to water molecules. Thus, changes in A(FHH) and B-FHH can be quantified when surface modification is isolated for the study of water-uptake. The fitted A(FHH) for PSL-NH2, PSL-COOH, and plain PSL is 0.23, 0.21, and 0.18 when B-FHH is unity. To simplify the use of FHH-AT for use in cloud activation models, we also present and test a new single parameter framework for insoluble compounds, kappa(FHH) . kappa(FHH) is within 5 % agreement of the experimental data and can be applied to describe a single-parameter hygroscopicity for water-insoluble aerosol with surface modified properties.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000867810000001
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/273418
作者单位	University System of Maryland; University of Maryland College Park; University System of Maryland; University of Maryland College Park
推荐引用方式 GB/T 7714	Mao, Chun-Ning,Gohil, Kanishk,Asa-Awuku, Akua A.. A single-parameter hygroscopicity model for functionalized insoluole aerosol surfaces[J],2022,22(19):10.
APA	Mao, Chun-Ning,Gohil, Kanishk,&Asa-Awuku, Akua A..(2022).A single-parameter hygroscopicity model for functionalized insoluole aerosol surfaces.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(19),10.
MLA	Mao, Chun-Ning,et al."A single-parameter hygroscopicity model for functionalized insoluole aerosol surfaces".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.19(2022):10.