Chakraborty Purnendu, Zachariah Michael R
Department of Mechanical Engineering and Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA.
J Phys Chem A. 2007 Jun 28;111(25):5459-64. doi: 10.1021/jp070226p. Epub 2007 Jun 1.
Atmospheric aerosols play a very important role in atmospheric processes and have a major influence on the global climate. In this paper, we report results of a molecular dynamics study on the unique properties of organic-coated water droplets. In particular, we find that, for particles preferring an inverted micelle structure, the lower chain-chain interaction, with increasing radial distance from the water-organic interface, results in a negative internal radial pressure profile for the organic layer. As a result, a coated particle behaves as though the surface tension is "negative" and implies that such a particle will inherently have an inverse Kelvin vapor pressure effect, resulting in increased water condensation.
大气气溶胶在大气过程中起着非常重要的作用，并对全球气候产生重大影响。在本文中，我们报告了一项关于有机包覆水滴独特性质的分子动力学研究结果。特别地，我们发现，对于倾向于形成反胶束结构的颗粒，随着与水-有机界面径向距离的增加，较低的链-链相互作用导致有机层的内部径向压力分布为负。结果，包覆颗粒的行为就好像表面张力是“负的”，这意味着这样的颗粒本质上会有逆开尔文蒸气压效应，导致水凝结增加。
