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A theoretical study on the activation of insoluble particles in atmospheric conditions

机译:大气条件下不溶性颗粒活化的理论研究

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A theoretical analysis for the description of insoluble particles activation in the atmosphere has been performed using as framework the classical theory of heterogeneous nucleation. In the current work a model for heterogeneous nucleation for one-component and two-component gaseous systems was presented taking into account the process of surface diffusion during nucleating embryo formation. The theory predicts higher nucleation rates compared to the classical theory of heterogeneous nucleation and consequently higher probability of particle activation. The model including the effect of surface diffusion shows a qualitative agreement with experimental results of heterogeneous nucleation of water at different substrates. In addition, the process of heterogeneous nucleation of the sulphuric acid - water system on the surface of insoluble spherical aerosol particles in atmospheric conditions has been examined. Insoluble particle activation is depended on several factors such as the concentration of the participating vapours, the ambient temperature, the chemical composition and particle size. Our results show that activation of insoluble particles is an energetically favourable process under specific conditions in the atmosphere.
机译:使用非均相成核的经典理论作为框架,进行了描述大气中不溶性颗粒活化的理论分析。在当前的工作中,考虑到成核胚胎形成过程中的表面扩散过程,提出了一种用于一组分和两组分气体系统的异相成核模型。与经典的异质成核理论相比,该理论预测更高的成核速率,因此粒子活化的可能性更高。包含表面扩散效应的模型与水在不同基底上的异质成核的实验结果显示出定性的一致性。此外,还研究了大气条件下不溶性球形气溶胶颗粒表面上硫酸-水系统的异相成核过程。不溶性颗粒的活化取决于几个因素,例如参与蒸气的浓度,环境温度,化学组成和粒径。我们的结果表明,在大气中特定条件下,不溶性颗粒的活化是在能量上有利的过程。

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