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| - Vapor Phase Homogeneous Nucleation of Higher Alkanes: Dodecane, Hexadecane, andOctadecane. 1. Critical Supersaturation and Nucleation Rate Measurements
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| - The critical supersaturations and isothermal homogeneous nucleation rates of dodecane, hexadecane, andoctadecane vapors have been measured over wide temperature ranges (e.g., 285−340 K) using an upwardthermal diffusion cloud chamber. Dodecane shows the best agreement between the experiment and the classicalnucleation theory. Hexadecane and octadecane exhibit critical supersaturations lower than those predicted bythe theory. All three compounds show increasing deviation from theory with decreasing temperature. Thistrend is also observed in the measured nucleation rates where the predictions of the theory at lower temperaturesare shifted to much lower values compared to the experimental data. Temperature dependence correctionfactors to the calculated rates have been evaluated based on the experimental rates of the studied higheralkanes. The classical theory predicts the correct supersaturation dependence of the nucleation rates of thesecompounds. Analysis of the supersaturation dependence of the nucleation rate of octadecane indicates thatthe critical cluster contains 30−35 molecules at the nucleation temperatures of 315−340 K. The classicaltheory predicts smaller nucleus size as a result of the overestimation of the supersaturation corresponding tothe measured nucleation rate.
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