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Molecular dynamics simulation of dicarboxylic acid coated aqueous aerosol: Structure and processing of water vapor.

机译:二羧酸涂覆的水溶胶的分子动力学模拟:水蒸气的结构和加工。

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摘要

Low molecular weight dicarboxylic acids constitute a significant fraction of water-soluble organic aerosols in the atmosphere. They have a potential contribution to the formation of cloud condensation nuclei (CCN) and are involved in a series of chemical reactions occurring in atmosphere. In this work, molecular dynamics simulation method was used to probe the structure and the interfacial properties of the dicarboxylic acid coated aqueous aerosol. Low molecular weight dicarboxylic acids of various chain lengths and water solubility were chosen to coat a water droplet consisting of 2440 water molecules. For malonic acid coated aerosol, the surface acid molecules dissolved into the water core and form an ordered structure due to the hydrophobic interactions. For other nanoaerosols coated with low solubility acids, phase separation between water and acid molecules was observed. To study the water processing of the coated aerosols, the water vapor accommodation factors were calculated.
机译:低分子量的二羧酸在大气中占水溶性有机气溶胶的很大一部分。它们对云凝结核(CCN)的形成有潜在的贡献,并参与大气中发生的一系列化学反应。在这项工作中,使用分子动力学模拟方法来探测二羧酸包覆的水性气溶胶的结构和界面特性。选择各种链长和水溶性的低分子量二羧酸来包被由2440个水分子组成的水滴。对于丙二酸涂覆的气溶胶,由于疏水相互作用,表面酸分子溶解到水核中并形成有序结构。对于涂覆有低溶解度酸的其他纳米气溶胶,观察到水和酸分子之间的相分离。为了研究涂层气雾剂的水处理过程,计算了水蒸气调节因子。

著录项

  • 作者

    Ma, Xiaofei.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Applied Mathematics.Nanoscience.Chemistry Physical.Atmospheric Chemistry.
  • 学位 M.S.
  • 年度 2010
  • 页码 82 p.
  • 总页数 82
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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