气候变化领域集成服务门户(CCPortal): Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane

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DOI	10.5194/acp-19-1649-2019
	Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane
	Janechek N.J.; Marek R.F.; Bryngelson N.; Singh A.; Bullard R.L.; Brune W.H.; Stanier C.O.
发表日期	2019
ISSN	16807316
起始页码	1649
结束页码	1664
卷号	19 期号:3
英文摘要	Cyclic volatile methyl siloxanes (cVMS) are high-production chemicals present in many personal care products. They are volatile, hydrophobic, and relatively long-lived due to slow oxidation kinetics. Evidence from chamber and ambient studies indicates that oxidation products may be found in the condensed aerosol phase. In this work, we use an oxidation flow reactor to produce ∼100 μm -3 of organosilicon aerosol from OH oxidation of decamethylcyclopentasiloxane (D 5 ) with aerosol mass fractions (i.e., yields) of 0.2-0.5. The aerosols were assessed for concentration, size distribution, morphology, sensitivity to seed aerosol, hygroscopicity, volatility and chemical composition through a combination of aerosol size distribution measurement, tandem differential mobility analysis, and electron microscopy. Similar aerosols were produced when vapor from solid antiperspirant was used as the reaction precursor. Aerosol yield was sensitive to chamber OH and to seed aerosol, suggesting sensitivity of lower-volatility species and recovered yields to oxidation conditions and chamber operation. The D 5 oxidation aerosol products were relatively non-hygroscopic, with an average hygroscopicity kappa of ∼0.01 and nearly non-volatile up to 190°C temperature. Parameters for exploratory treatment as a semi-volatile organic aerosol in atmospheric models are provided. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; aerosol composition; hydroxide; hygroscopicity; oxidation; photochemistry; physical property; silicon; size distribution
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/144652
作者单位	Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA, United States; IIHR-Hydroscience and Engineering, University of Iowa, Iowa City, IA, United States; Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, United States; Yokogawa Corporation of America, Newnan, GA, United States; Institute for Advanced Sustainability Studies, Potsdam, 14467, Germany; Lovelace Respiratory Research Institute, Albuquerque, NM, United States
推荐引用方式 GB/T 7714	Janechek N.J.,Marek R.F.,Bryngelson N.,et al. Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane[J],2019,19(3).
APA	Janechek N.J..,Marek R.F..,Bryngelson N..,Singh A..,Bullard R.L..,...&Stanier C.O..(2019).Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane.Atmospheric Chemistry and Physics,19(3).
MLA	Janechek N.J.,et al."Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane".Atmospheric Chemistry and Physics 19.3(2019).