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Discussion papers
https://doi.org/10.5194/acp-2018-748
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-748
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 29 Aug 2018

Research article | 29 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Physical Properties of Secondary Photochemical Aerosol from OH Oxidation of a Cyclic Siloxane

Nathan J. Janechek1,2, Rachel F. Marek2, Nathan Bryngelson1,2,a, Ashish Singh1,2,b, Robert L. Bullard1,2,c, William H. Brune3, and Charles O. Stanier1,2 Nathan J. Janechek et al.
  • 1Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA, USA
  • 2IIHR-Hydroscience and Engineering, University of Iowa, Iowa City, IA, USA
  • 3Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, USA
  • anow at: Yokogawa Corporation of America – Analytical Process Analyzers
  • bnow at: Institute for Advanced Sustainability Studies, Potsdam-14467, Germany
  • cnow at: Lovelace Respiratory Research Institute, Albuquerque, NM, USA

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 ~100µgm−3 of organosilicon aerosol from OH oxidation of decamethylcyclopentasiloxane (D5) 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 or from hair conditioner was used as the reaction precursor. Aerosol yield was sensitive to chamber OH, indicating an interplay between oxidation conditions and the concentration of lower volatility species. The D5 oxidation aerosol products were relatively non-hygroscopic, with average hygroscopicity kappa of ~0.01, and nearly non-volatile up to 190°C temperature. Recommended parameters for treatment as a semi-volatile organic aerosol in atmospheric models are provided.

Nathan J. Janechek et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Nathan J. Janechek et al.
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