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Binary nucleation in acid–water systems. I. Methanesulfonic acid–water

Wyslouzil, B. E. and Seinfeld, J. H. and Flagan, R. C. and Okuyama, K. (1991) Binary nucleation in acid–water systems. I. Methanesulfonic acid–water. Journal of Chemical Physics, 94 (10). pp. 6827-6841. ISSN 0021-9606.

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Experimental measurements of binary nucleation between methanesulfonic acid and water vapor were carried out for relative acidities (Ra), 0.05<Ra<0.65, and relative humidities (Rh), 0.06<Rh<0.65, using a continuous flow mixing-type device. The number concentration of particles leaving the nucleation and growth tube was measured as a function of the initial relative humidity and the relative acidity in the temperature range from 20 to 30 °C. Particle size distributions were also measured and found to vary with the amount of water and acid present. The system was simulated to predict the total number of particles and the total mass of acid in the aerosol phase using a simple integral model and classical binary nucleation theory allowing for the formation of acid–water hydrates in the gas phase. At low particle concentrations, condensation rates did not significantly change the saturation levels and the nucleation rates were estimated from the total number concentration data as functions of Ra, Rh, and temperature. The values of experimental and theoretical nucleation rates differed significantly, with Jexpt/Jtheor changing as a function of temperature from 10^–8 to 10^–4 as temperature varied from 20 to 30 °C. This work represents the first systematic experimental study of the temperature dependence of binary nucleation.

Item Type:Article
Additional Information:Copyright © 1991 American Institute of Physics (Received 22 October 1990; accepted 29 January 1991) The authors gratefully acknowledge the assistance of Sonia Kreidenweis who provided computer programs used to correlate the physical property data and simulate the experiments. This work was supported by National Science Foundation Grant No. ATM-9003186 and by the Alberta Heritage Scholarship Fund (B.E.W.).
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Deposited On:19 Oct 2006
Last Modified:26 Dec 2012 09:13

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