Theoretical constraints on pure vapor-pressure driven condensation of organics to ultrafine particles
Theoretical constraints on pure vapor-pressure driven condensation of organics to ultrafine particles
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DOI：
10.1029/2011gl048115
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发表时间：
2011-08-16
影响因子：
5.2
通讯作者：
Riipinen, I.
中科院分区：
文献类型：
--
作者：
Donahue, N. M.;Trump, E. R.;Riipinen, I.
有机凝结成新核粒子对它们的生长有很大的贡献。在这里，我们探讨了这一过程的一系列限制，假设有机蒸气被羟基自由基气相氧化形成的有机物具有足够低的挥发性，可以凝结成2- 20nm尺寸范围内的颗粒。为了凝结而不是均匀成核，蒸汽需要在10(-3)- 10(-2)μ g - m（-3）范围内具有饱和浓度（C*），而这正是气相化学可能产生的范围。至少有一半观察到的超细颗粒的生长速度可以用这些简单的考虑和限制来解释。引用本文：Donahue， N. M.， E. R. Trump， J. R. Pierce和I. Riipinen(2011)，纯蒸汽压驱动的有机物质凝结成超细颗粒的理论约束，地球物理学。卷。， 38, L16801, doi:10.1029/2011GL048115。
Organic condensation to freshly nucleated particles contributes substantially to their growth. Here we explore a range of constraints on this process, under the assumption that gas-phase oxidation of organic vapors by hydroxy radical is forming organics with a sufficiently low volatility to condense onto particles in the 2-20 nm size range. To condense but not homogeneously nucleate, vapors need to have saturation concentrations (C*) in the 10(-3) - 10(-2) mu g m(-3) range, and this is exactly the range that gas-phase chemistry is likely to produce. At least half of the observed growth rate of ultrafine particles can be explained by these simple considerations and constraints. Citation: Donahue, N. M., E. R. Trump, J. R. Pierce, and I. Riipinen (2011), Theoretical constraints on pure vapor-pressure driven condensation of organics to ultrafine particles, Geophys. Res. Lett., 38, L16801, doi:10.1029/2011GL048115.