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Impact of Organic Coating on Optical Growth of Ammonium Sulfate Particles

机译：有机涂层对硫酸铵颗粒光学生长的影响

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摘要

Light extinction by particles in Earth's atmosphere is strongly dependent on particle size,chemical composition,hygroscopic growth properties,and particle mixing state.Here,the influence of an organic coating on particle optical growth was studied.The particle optical growth factor,fRH_(ext),was measured using cavity ring-down aerosol extinction spectroscopy at 532 nm.The particles were composed of ammonium sulfate (AS),1,2,6-hexanetriol,and mixed particles containing a wet or dry ammonium sulfate core and a 1,2,6-hexanetriol coating.Dry,coated particles were generated by atomization followed by drying.Wet,coated particles were formed via liquid-liquid phase separation (LLPS).LLPS was achieved by deliquescing and then drying the particles to a relative humidity (RH) between the phase separation RH and the efflorescence RH.For the LLPS particles,the fRH_(ext) at each RH was between the/RHext of ammonium sulfate and that of 1,2,6-hexanetriol.In contrast,for the mixed dry,coated particles,the fRH_(ext) was the same as 1,2,6-hexanetriol particles.At room temperature,the water uptake properties of AS coated with 1,2,6-hexanetriol are largely dictated by the phase of the AS.Thus,the total watei uptake depends on the RH history of the particle and the resulting phase of AS.
机译：地球大气中颗粒的消光强烈依赖于颗粒大小，化学组成，吸湿性和颗粒混合状态。在此，研究了有机涂层对颗粒光学生长的影响。颗粒光学生长因子fRH_（ext ），是使用腔衰荡型气溶胶消光光谱法在532 nm处测量的。颗粒由硫酸铵（AS），1,2,6-己三醇以及含有湿或干硫酸铵芯和1， 2,6-己三醇涂层。通过雾化干燥产生干燥的涂层颗粒。通过液-液相分离（LLPS）形成潮湿的涂层颗粒。通过液化然后干燥到相对湿度来获得LLPS对于LLPS颗粒，每个RH的fRH_（ext）介于硫酸铵和1,2,6-己三醇的fRH_（ext）之间。干燥的涂层颗粒，fRH_（ext）与1,2,6-己三醇颗粒相同。在室温下，1,2,6-己三醇包覆的AS的吸水性能在很大程度上取决于AS的相。水的总摄入量取决于颗粒的相对湿度历史和所得到的AS相。

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  • 来源
    《Environmental Science & Technology》 |2013年第23期|13339-13346|共8页
  • 作者

    Carly B.Robinson; Gregory P.Schill; Kyle J.Zarzana; Margaret A.Tolbert;

  • 作者单位

    Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES),University of Colorado at Boulder,Boulder,Colorado 80309-0216,United States;

    Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES),University of Colorado at Boulder,Boulder,Colorado 80309-0216,United States;

    Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES),University of Colorado at Boulder,Boulder,Colorado 80309-0216,United States;

    Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES),University of Colorado at Boulder,Boulder,Colorado 80309-0216,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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