New approach to the kinetics of heterogeneous unary nucleation on liquid aerosols of a binary solution.
New approach to the kinetics of heterogeneous unary nucleation on liquid aerosols of a binary solution.
复制标题
DOI：
10.1063/1.2423012
复制
发表时间：
2006-12
期刊：
影响因子：
--
通讯作者：
Y. Djikaev;E. Ruckenstein
中科院分区：
文献类型：
--
作者：
Y. Djikaev;E. Ruckenstein
在吸湿中心上形成液滴可以通过科勒活化以无障碍的方式发生，或者通过克服自由能垒而成核。与前者不同的是，这个过程的后一种机制研究得很少，并且仅在基于毛细作用近似的经典成核理论的框架内，其中成核液滴表现得像散装液体。在本文中，作者采用另一种方法的动力学的非均质成核液体二元气溶胶，第一次通过时间分析的基础上，避免了表面张力的概念，微小的液滴参与成核。考虑了含有非挥发性溶质的二元溶液的液体气溶胶。除了模拟通过固体可溶性颗粒潮解形成的气溶胶外，所考虑的气溶胶还构成了“加工”海洋气溶胶的粗略模型。用Lennard-Jones势描述溶质分子间的相互作用，数值计算了水蒸气在非挥发性非离解溶质分子的二元气溶胶上的凝结.
The formation of a droplet on a hygroscopic center may occur either in a barrierless way via Kohler activation or via nucleation by overcoming a free energy barrier. Unlike the former, the latter mechanism of this process has been studied very little and only in the framework of the classical nucleation theory based on the capillarity approximation whereby a nucleating droplet behaves like a bulk liquid. In this paper the authors apply another approach to the kinetics of heterogeneous nucleation on liquid binary aerosols, based on a first passage time analysis which avoids the concept of surface tension for tiny droplets involved in nucleation. Liquid aerosols of a binary solution containing a nonvolatile solute are considered. In addition to modeling aerosols formed through the deliquescence of solid soluble particles, the considered aerosols constitute a rough model of "processed" marine aerosols. The theoretical results are illustrated by numerical calculations for the condensation of water vapor on binary aqueous aerosols with nonvolatile nondissociating solute molecules using Lennard-Jones potentials for the molecular interactions.