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首页> 外文期刊>Environmental Science & Technology >Effects Of Coating Of Dicarboxylic Acids On The Mass-mobility Relationship Of Soot Particles
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Effects Of Coating Of Dicarboxylic Acids On The Mass-mobility Relationship Of Soot Particles

机译：二元羧酸涂层对烟尘颗粒质量迁移率关系的影响

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摘要

Atandem differential mobility analyzer (TDMA) and a differential mobility analyzer-aerosol particle mass analyzer (DMA-APM) have been employed to study morphology and hygroscopicity of soot aerosol internally mixed with dicarboxylic acids. The effective densities, fractal dimensions, and dynamic shape factors of soot particles before and after coating with succinic and glutaric acids are determined. Coating of soot with succinic acid results in a significant increase in the particle mobility diameter, mass, and effective density, but these properties recover to their initial values once succinic acid is removed by heating, suggesting that no restructuring of the soot core occurs. This conclusion is also supported from the observation of similar fractal dimensions and dynamic shape factors for fresh and coated/heated soot aggregates. Also, no change is observed when succinic acid-coated aggregates are cycled through elevated relative humidity (5% to 90% to 5% RH) below the succinic acid deliquescence point. When soot is coated with glutaric acid, the particle mass increases, but the mobility diameter shrinks by 10-40%. Cycling the soot aerosol coated with glutaric acid through elevated relative humidity leads to an additional mass increase, indicating that condensed water remains within the coating even at low RH. The fractal dimension of soot particles increases after coating and remains high when glutaric acid is removed by heating. The dynamic shape factor of glutaric acid-coated and heated soot is significantly lower than that of fresh soot, suggesting a significant restructuring of the soot agglomerates by glutaric acid. The results imply that internal mixing of soot aerosol during atmospheric aging leads to changes in hygroscopicity, morphology, and effective density, which likely modify their effects on direct and indirect climate forcing and deposition in the human respiratory system.
机译：已使用Atandem差动迁移率分析仪（TDMA）和差动迁移率分析仪-气溶胶颗粒质量分析仪（DMA-APM）来研究内部混有二羧酸的烟灰气溶胶的形态和吸湿性。确定在用琥珀酸和戊二酸涂覆之前和之后烟灰颗粒的有效密度，分形维数和动态形状因子。用琥珀酸涂覆烟灰会导致颗粒迁移直径，质量和有效密度的显着增加，但是一旦通过加热去除了琥珀酸，这些性能便恢复到其初始值，这表明烟灰芯未发生重组。对于新鲜的和包覆的/加热的烟灰团聚体，观察到相似的分形维数和动态形状因子，也支持该结论。而且，当将琥珀酸涂覆的聚集体循环通过低于琥珀酸潮解点的相对湿度（5％至90％至5％RH）时，没有观察到变化。当烟灰用戊二酸包被时，颗粒质量增加，但迁移率直径缩小10-40％。通过升高的相对湿度使涂有戊二酸的烟灰气溶胶循环，导致质量进一步增加，这表明即使在低RH条件下，冷凝水仍保留在涂层中。涂覆后，烟灰颗粒的分形维数增加，而当通过加热除去戊二酸时，则保持高。戊二酸涂覆和加热的烟灰的动态形状因子显着低于新鲜烟灰的动态形状因数，表明戊二酸对烟灰附聚物产生了显着的重组。结果表明，大气老化过程中烟灰气溶胶的内部混合会导致吸湿性，形态和有效密度发生变化，这可能会改变其对人类呼吸系统中直接和间接气候强迫和沉积的影响。

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  • 来源
    《Environmental Science & Technology》 |2009年第8期|2787-2792|共6页
  • 作者

    HUAXIN XUE; ALEXEI F. KHALIZOV; LIN WANG; JUN ZHENG; RENYI ZHANG;

  • 作者单位

    Department of Atmospheric Sciences and Department of Chemistry, Texas A&M University, College Station, Texas 77843;

    Department of Atmospheric Sciences and Department of Chemistry, Texas A&M University, College Station, Texas 77843;

    Department of Atmospheric Sciences and Department of Chemistry, Texas A&M University, College Station, Texas 77843;

    Department of Atmospheric Sciences and Department of Chemistry, Texas A&M University, College Station, Texas 77843;

    Department of Atmospheric Sciences and Department of Chemistry, Texas A&M University, College Station, Texas 77843;

  • 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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  • 正文语种 eng
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