Viscosities, diffusion coefficients, and mixing times of intrinsic fluorescent organic molecules in brown limonene secondary organic aerosol and tests of the Stokes–Einstein equation

Ullmann, Dagny A.; Hinks, Mallory L.; Maclean, Adrian M.; Butenhoff, Christopher L.; Grayson, James W.; Barsanti, Kelley; Jimenez, Jose L.; Nizkorodov, Sergey A.; Kamal, Saeid; Bertram, Allan K.

doi:https://doi.org/10.5194/acp-19-1491-2019

Articles | Volume 19, issue 3

https://doi.org/10.5194/acp-19-1491-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-19-1491-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 3

Research article

|

04 Feb 2019

Research article |

| 04 Feb 2019

Viscosities, diffusion coefficients, and mixing times of intrinsic fluorescent organic molecules in brown limonene secondary organic aerosol and tests of the Stokes–Einstein equation

Dagny A. Ullmann, Mallory L. Hinks, Adrian M. Maclean, Christopher L. Butenhoff, James W. Grayson, Kelley Barsanti, Jose L. Jimenez, Sergey A. Nizkorodov, Saeid Kamal, and Allan K. Bertram

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Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Report on D. A. Ullmann et al. maunscript', Anonymous Referee #1, 29 Sep 2018
RC2: 'Review of acp-2018-899', Anonymous Referee #2, 15 Oct 2018
AC1: 'Author response to anonymous reviewers 1 and 2', Adrian Maclean, 26 Nov 2018

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AR: Author's response | RR: Referee report | ED: Editor decision

AR by Adrian Maclean on behalf of the Authors (04 Dec 2018) Author's response Manuscript

ED: Publish as is (17 Dec 2018) by Alexander Laskin

AR by Adrian Maclean on behalf of the Authors (22 Dec 2018)

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Short summary

We measured the viscosity and diffusion of organic molecules in secondary organic aerosol (SOA) generated from the ozonolysis of limonene. The results suggest that the mixing times of large organics in the SOA studied are short (< 1 h) for conditions found in the planetary boundary layer. The results also show that the Stokes–Einstein equation gives accurate predictions of diffusion coefficients of large organics within the studied SOA up to a viscosity of 102 to 104 Pa s.