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Relative Humidity Dependence of Soot Aggregate Restructuring Induced by Secondary Organic Aerosol: Effects of Water on Coating Viscosity and Surface Tension
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2017-08-21 00:00:00 , DOI: 10.1021/acs.estlett.7b00298 Kaiser K. Leung 1 , Elijah G. Schnitzler 2 , Wolfgang Jäger 2 , Jason S. Olfert 1
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2017-08-21 00:00:00 , DOI: 10.1021/acs.estlett.7b00298 Kaiser K. Leung 1 , Elijah G. Schnitzler 2 , Wolfgang Jäger 2 , Jason S. Olfert 1
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Soot aggregates have a significant warming effect on climate, and their structural and optical properties may evolve in the presence of coatings. Here, the relative humidity (RH) dependence of soot aggregate restructuring induced by secondary organic aerosol (SOA) coatings was investigated in a series of photo-oxidation experiments. Burner-generated soot aggregates were classified by mobility diameter and injected into a smog chamber, where they were exposed to oxidation products of p-xylene; coated aggregates were subsequently conditioned at one of the following RHs: <12%, 20%, 40%, 60%, or 85%. Changes in diameter and mass were monitored using differential mobility and centrifugal particle mass analyzers, respectively. At RH < 12%, the SOA coating was too viscous to induce restructuring, so the particle diameter increased uniformly with coating mass. At RH ≥ 20%, the SOA coating induced restructuring, and the degree of restructuring increased with RH, indicating that the decreased viscosity and increased surface tension of SOA have significant implications on SOA-induced restructuring of soot aggregates. At RH ≥ 60%, appreciable water uptake occurred, and the hygroscopicity parameter of the SOA coating was derived. Our results provide crucial insights into the complex interactions between soot, SOA, and water in the atmosphere.
中文翻译：
二次有机气溶胶引起烟灰聚集体重构的相对湿度依赖性：水对涂层粘度和表面张力的影响
烟灰聚集体对气候有显着的变暖作用，并且在存在涂层的情况下其结构和光学性质可能会发生变化。在此，在一系列光氧化实验中研究了由次级有机气溶胶（SOA）涂层引起的烟灰聚集体重构的相对湿度（RH）依赖性。燃烧器产生的烟灰聚集体按迁移率直径分类，并注入烟雾室，在此它们暴露于p的氧化产物。-二甲苯; 随后将包被的聚集体调至以下相对湿度之一：<12％，20％，40％，60％或85％。分别使用差动迁移率和离心颗粒质量分析仪监测直径和质量的变化。在RH <12％时，SOA涂层太粘而无法引起重组，因此粒径随涂层质量而均匀增加。在RH≥20％时，SOA涂层会引起重组，重组程度随RH的增加而增加，这表明SOA的粘度降低和表面张力增加对SOA诱导的烟灰聚集体重组具有重要影响。在RH≥60％时，会发生明显的吸水率，并得出SOA涂层的吸湿性参数。我们的结果提供了对烟尘，SOA，
更新日期：2017-08-21
中文翻译：
二次有机气溶胶引起烟灰聚集体重构的相对湿度依赖性：水对涂层粘度和表面张力的影响
烟灰聚集体对气候有显着的变暖作用，并且在存在涂层的情况下其结构和光学性质可能会发生变化。在此，在一系列光氧化实验中研究了由次级有机气溶胶（SOA）涂层引起的烟灰聚集体重构的相对湿度（RH）依赖性。燃烧器产生的烟灰聚集体按迁移率直径分类，并注入烟雾室，在此它们暴露于p的氧化产物。-二甲苯; 随后将包被的聚集体调至以下相对湿度之一：<12％，20％，40％，60％或85％。分别使用差动迁移率和离心颗粒质量分析仪监测直径和质量的变化。在RH <12％时，SOA涂层太粘而无法引起重组，因此粒径随涂层质量而均匀增加。在RH≥20％时，SOA涂层会引起重组，重组程度随RH的增加而增加，这表明SOA的粘度降低和表面张力增加对SOA诱导的烟灰聚集体重组具有重要影响。在RH≥60％时，会发生明显的吸水率，并得出SOA涂层的吸湿性参数。我们的结果提供了对烟尘，SOA，
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