Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane

Nathan J. Janechek, Rachel F. Marek, Nathan Bryngelson, Ashish Singh, Robert L. Bullard, William Henry Brune, Charles O. Stanier

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1649-1664
Number of pages16
JournalAtmospheric Chemistry and Physics
Volume19
Issue number3
DOIs
StatePublished - Feb 8 2019

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physical property
aerosol
oxidation
hygroscopicity
seed
electron microscopy
chemical composition
particle size
kinetics
product

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Janechek, N. J., Marek, R. F., Bryngelson, N., Singh, A., Bullard, R. L., Brune, W. H., & Stanier, C. O. (2019). Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane. Atmospheric Chemistry and Physics, 19(3), 1649-1664. https://doi.org/10.5194/acp-19-1649-2019
Janechek, Nathan J. ; Marek, Rachel F. ; Bryngelson, Nathan ; Singh, Ashish ; Bullard, Robert L. ; Brune, William Henry ; Stanier, Charles O. / Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane. In: Atmospheric Chemistry and Physics. 2019 ; Vol. 19, No. 3. pp. 1649-1664.
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Janechek, NJ, Marek, RF, Bryngelson, N, Singh, A, Bullard, RL, Brune, WH & Stanier, CO 2019, 'Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane', Atmospheric Chemistry and Physics, vol. 19, no. 3, pp. 1649-1664. https://doi.org/10.5194/acp-19-1649-2019

Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane. / Janechek, Nathan J.; Marek, Rachel F.; Bryngelson, Nathan; Singh, Ashish; Bullard, Robert L.; Brune, William Henry; Stanier, Charles O.

In: Atmospheric Chemistry and Physics, Vol. 19, No. 3, 08.02.2019, p. 1649-1664.

Research output: Contribution to journalArticle

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AU - Janechek, Nathan J.

AU - Marek, Rachel F.

AU - Bryngelson, Nathan

AU - Singh, Ashish

AU - Bullard, Robert L.

AU - Brune, William Henry

AU - Stanier, Charles O.

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