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首页> 外文期刊>Atmospheric chemistry and physics >Towards closing the gap between hygroscopic growth and activation for secondary organic aerosol-Part 2: Theoretical approaches
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Towards closing the gap between hygroscopic growth and activation for secondary organic aerosol-Part 2: Theoretical approaches

机译：试图缩小吸湿性增长与次生有机气溶胶活化之间的差距，第2部分：理论方法

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摘要

We examine the hygroscopic properties of secondary organic aerosol particles generated through the reaction of -pinene and ozone using a continuous flow reaction chamber. The water activity versus composition relationship is calculated from measurements of growth factors at relative humidities up to 99.6% and from measurements of cloud condensation nuclei activity. The observed relationships are complex, suggesting highly non-ideal behavior for aerosol water contents at relative humidities less than 98%. We present two models that may explain the observed water activity-composition relationship equally well. The first model assumes that the aerosol is a pseudo binary mixture of infinitely water soluble compounds and sparingly soluble compounds that gradually enter the solution as dilution increases. The second model is used to compute the Gibbs free energy of the aerosol-water mixture and shows that the aerosol behaves similarly to what can be expected for single compounds that contain a certain fraction of oxygenated and non-polar functional groups.
机译：我们研究了使用连续流动反应室通过-pine烯和臭氧反应生成的二次有机气溶胶颗粒的吸湿特性。水分活度与组成的关系是根据相对湿度高达99.6％的生长因子的测量结果以及云凝结核活性的测量结果计算得出的。观察到的关系很复杂，表明在相对湿度小于98％时，气溶胶水含量极不理想。我们提出了两个模型，它们可以很好地解释观察到的水活度-组成关系。第一个模型假设气雾剂是无限水溶性化合物和微溶化合物的假二元混合物，随着稀释度的增加逐渐进入溶液。第二个模型用于计算气溶胶-水混合物的吉布斯自由能，并且表明该气溶胶的行为类似于包含一定比例的氧化和非极性官能团的单个化合物的预期行为。

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