دورية أكاديمية
Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions
| العنوان: | Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
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| المؤلفون: | M. A. Zawadowicz, S. R. Proud, S. S. Seppalainen, D. J. Cziczo |
| المصدر: | Atmospheric Chemistry and Physics, Vol 15, Iss 15, Pp 8975-8986 (2015) |
| بيانات النشر: | Copernicus Publications, 2015. |
| سنة النشر: | 2015 |
| المجموعة: | LCC:Physics LCC:Chemistry |
| مصطلحات موضوعية: | Physics, QC1-999, Chemistry, QD1-999 |
| الوصف: | Atmospheric aerosol particles are often partially or completely composed of inorganic salts, such as ammonium sulfate and sodium chloride, and therefore exhibit hygroscopic properties. Many inorganic salts have well-defined deliquescence and efflorescence points at which they take up and lose water, respectively. Field measurements have shown that atmospheric aerosols are not typically pure inorganic salt, instead, they often also contain organic species. There is ample evidence from laboratory studies that suggests that mixed particles exist in a phase-separated state, with an aqueous inorganic core and organic shell. Although phase separation has not been measured in situ, there is no reason it would not also take place in the atmosphere. Here, we investigate the deliquescence and efflorescence points, phase separation and ability to exchange gas-phase components of mixed organic and inorganic aerosol using a flow tube coupled with FTIR (Fourier transform infrared) spectroscopy. Ammonium sulfate aerosol mixed with organic polyols with different O : C ratios, including 1,4-butanediol, glycerol, 1,2,6-hexanetriol, 1,2-hexanediol, and 1,5-pentanediol have been investigated. Those constituents correspond to materials found in the atmosphere in great abundance and, therefore, particles prepared in this study should mimic atmospheric mixed-phase aerosol particles. Some results of this study tend to be in agreement with previous microscopy experiments, but others, such as phase separation properties of 1,2,6-hexanetriol, do not agree with previous work. Because the particles studied in this experiment are of a smaller size than those used in microscopy studies, the discrepancies found could be a size-related effect. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1680-7316 1680-7324 8975-2015 |
| Relation: | http://www.atmos-chem-phys.net/15/8975/2015/acp-15-8975-2015.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324 |
| DOI: | 10.5194/acp-15-8975-2015 |
| URL الوصول: | https://doaj.org/article/79dc0c22e5884fbc9e3773474a821e5c |
| رقم الأكسشن: | edsdoj.79dc0c22e5884fbc9e3773474a821e5c |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16807316 16807324 89752015 |
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| DOI: | 10.5194/acp-15-8975-2015 |