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Determination of saturation pressure and enthalpy of vaporization of semi-volatile aerosols: the integrated volume mentod
Saleh, R., J. WALKER, JR., AND A. Khlystov. Determination of saturation pressure and enthalpy of vaporization of semi-volatile aerosols: the integrated volume mentod. JOURNAL OF AEROSOL SCIENCE. Elsevier Science Ltd, New York, NY, 39(10):876-887, (2008).
This study presents the integrated volume method for estimating saturation pressure and enthalpy of vaporization of a whole aerosol distribution. We measure the change of total volume of an aerosol distribution between a reference state and several heated states, with the heating performed in a thermodenuder. In both the reference and heated states, the aerosol should be at equilibrium, that is the surrounding gas phase should be saturated with the vapor of the aerosol species. We derive an expression that correlates the volume change to the inverse of temperature from which the saturation pressure and enthalpy of vaporization can be estimated. Transport and aerosol dynamics computational models are developed to investigate the two main conditions for this analysis to be valid.