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首页> 外文期刊>Environmental Science & Technology >Probing the Evaporation Dynamics of Mixed SOA/Squalane Particles Using Size-Resolved Composition and Single-Particle Measurements
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Probing the Evaporation Dynamics of Mixed SOA/Squalane Particles Using Size-Resolved Composition and Single-Particle Measurements

机译：使用尺寸分辨成分和单颗粒测量探测混合SOA /角鲨烷颗粒的蒸发动力学

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摘要

An analysis of the formation and evaporation of mixed-particles containing squalane (a surrogate for hydrophobic primary organic aerosol, POA) and secondary organic aerosol (SOA) is presented. In these experiments, one material (D_(62)-squalane or SOA from α-pinene + O_3) was prepared first to serve as surface area for condensation of the other, forming the mixed-particles. The mixed-particles were then subjected to a heating-ramp from 22 to 44 ℃. We were able to determine that (1) almost all of the SOA mass is comprised of material less volatile than D_(62)-squalane; (2) AMS collection efficiency in these mixed-particle systems can be parametrized as a function of the relative mass fraction of the components; and (3) the vast majority of D_(62)-squalane is able to evaporate from the mixed particles, and does so on the same time scale regardless of the order of preparation. We also performed two-population mixing experiments to directly test whether D_(62)-squalane and SOA from α-pinene + O_3 form a single solution or two separate phases. We find that these two OA types are immiscible, which informs our inference of the morphology of the mixed-particles. If the morphology is core-shell and dictated by the order of preparation, these data indicate that squalane is able to diffuse relatively quickly through the SOA shell, implying that there are no major diffusion limitations.
机译：提出了对含有角鲨烷（疏水性一级有机气溶胶，POA的替代物）和二级有机气溶胶（SOA）的混合颗粒形成和蒸发的分析。在这些实验中，首先制备了一种材料（D_（62）-角鲨烷或来自α-pine烯+ O_3的SOA）作为另一种材料缩合的表面积，从而形成了混合颗粒。然后将混合颗粒进行22至44℃的加热。我们能够确定（1）几乎所有SOA物质的挥发性都低于D_（62）-角鲨烷； （2）在这些混合粒子系统中，AMS的收集效率可根据组分的相对质量分数进行参数设置； （3）绝大多数D_（62）-角鲨烷能够从混合颗粒中蒸发，并且在相同的时间尺度上蒸发，而与制备顺序无关。我们还进行了两个种群的混合实验，以直接测试D_（62）-角鲨烷和来自α-pine烯+ O_3的SOA是形成单一溶液还是两个独立的相。我们发现这两种OA类型是不混溶的，这有助于我们推断混合粒子的形态。如果形态是核-壳并且由制备顺序决定，则这些数据表明角鲨烷能够通过SOA壳相对较快地扩散，这意味着没有主要的扩散限制。

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  • 来源
    《Environmental Science & Technology》 |2015年第16期|9724-9732|共9页
  • 作者

    Ellis Shipley Robinson; Rawad Saleh; Neil M. Donahue;

  • 作者单位

    Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States;

    Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States;

    Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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