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Uptake Dynamics and Diffusion of HCl in Sulfuric Acid Solution Measured in Single Levitated Microdroplets

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    Uptake Dynamics and Diffusion of HCl in Sulfuric Acid Solution Measured in Single Levitated Microdroplets
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    Institut für Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
    Institut für Experimentalphysik, Freie Universität Berlin, Arnimalle 14, D-14195 Berlin, Germany
    Fachbereich Physik, Universität Osnabrück, Barbarastrasse 7, D-49069 Osnabrück, Germany
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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2000, 104, 29, 6726–6732
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    https://doi.org/10.1021/jp994200c
    Published July 1, 2000
    Copyright © 2000 American Chemical Society
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    Abstract

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    The uptake dynamics of HCl by single sulfuric acid microdroplets under stratospheric conditions is investigated. The droplets are typically 30−70 μm in diameter and weakly charged so that they can be stored in an electrodynamic trap. The gas uptake of the droplets is monitored either by measuring their size by angle resolved Mie- scattering patterns or by electrostatic balancing of the droplets in the trap. At low temperatures and high sulfuric acid concentration (T < 190 K for 48 wt % H2SO4 and T < 195 K for 56 wt % H2SO4, respectively), liquid-phase diffusion inside the droplet is the rate-limiting step in the overall uptake process. In this regime, the diffusion coefficients Dliq of HCl in supercooled sulfuric acid solutions are found to increase strongly with temperature and H2O concentration. The results are discussed with respect to diffusion models that have been proposed recently. In contrast, at higher temperatures and lower sulfuric acid concentrations (30−40 wt % H2SO4, 185−207 K) gas-phase diffusion with subsequent accommodation/dissolution at the liquid surface determines the observed uptake velocity. A new method to deduce accommodation coefficients α is proposed.

    Copyright © 2000 American Chemical Society

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    †

     Present address:  DAMAp Observatoire de Paris-Meudon, UMR 8588 du CNRS, 5 place Jules Jannsen, F-92195 Meudon Cedex, France.

    ‡

     Present address:  Institut für Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany.

    *

     To whom correspondence should be addressed. Electronic mail:  [email protected]

    Cited By

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    This article is cited by 18 publications.

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    18. M. Schwell, H. Baumgaertel, I. Weidinger, B. Kraemer, H. Vortisch, L. Woeste, T. Leisner, E. Ruehl. ChemInform Abstract: Uptake Dynamics and Diffusion of HCl in Sulfuric Acid Solution Measured in Single Levitated Microdroplets.. ChemInform 2000, 31 (45) https://doi.org/10.1002/chin.200045020
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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2000, 104, 29, 6726–6732
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jp994200c
    Published July 1, 2000
    Copyright © 2000 American Chemical Society
    Request reuse permissions

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