Articles | Volume 16, issue 20
https://doi.org/10.5194/acp-16-13035-2016
https://doi.org/10.5194/acp-16-13035-2016
Research article
 | 
21 Oct 2016
Research article |  | 21 Oct 2016

The effect of viscosity and diffusion on the HO2 uptake by sucrose and secondary organic aerosol particles

Pascale S. J. Lakey, Thomas Berkemeier, Manuel Krapf, Josef Dommen, Sarah S. Steimer, Lisa K. Whalley, Trevor Ingham, Maria T. Baeza-Romero, Ulrich Pöschl, Manabu Shiraiwa, Markus Ammann, and Dwayne E. Heard

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Subject: Aerosols | Research Activity: Laboratory Studies | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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Cited articles

Ammann, M.: Using 13N as tracer in heterogeneous atmospheric chemistry experiments, Radiochim. Acta, 89, 831–838, 2001.
Arens, F., Gutzwiller, L., Baltensperger, U., Gäggeler, H. W., and Ammann, M.: Heterogeneous reaction of NO2 on diesel soot particles, Environ. Sci. Technol., 35, 2191–2199, 2001.
Badger, C. L., Griffiths, P. T., George, I., Abbatt, J. P. D., and Cox, R. A.: Reactive uptake of N2O5 by aerosol particles containing mixtures of humic acid and ammonium sulfate, J. Phys. Chem. A, 110, 6986–6994, https://doi.org/10.1021/jp0562678, 2006.
Bedjanian, Y., Romanias, M. N., and El Zein, A.: Uptake of HO2 radicals on Arizona Test Dust, Atmos. Chem. Phys., 13, 6461–6471, https://doi.org/10.5194/acp-13-6461-2013, 2013.
Behr, P., Scharfenort, U., Ataya, K., and Zellner, R.: Dynamics and mass accommodation of HCl molecules on sulfuric acid–water surfaces, Phys. Chem. Chem. Phys., 11, 8048–8055, 2009.
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Short summary
Chemical oxidation in the atmosphere removes pollutants and greenhouse gases but generates undesirable products such as secondary organic aerosol. Radicals are key intermediates in oxidation, but how they interact with aerosols is still not well understood. Here we use a laser to measure the loss of radicals onto oxidised aerosols generated in a smog chamber. The loss of radicals was controlled by the thickness or viscosity of the aerosols, confirmed by using sugar aerosols of known thickness.
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