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Temporally and spatially resolved investigation on the efflorescence process of a mixed droplet of ammonium sulfate and ammonium nitrate |
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| Authors: | Feng Wang YuXia Zheng YunHong Zhang |
| Affiliation: | WANG Feng~1,2,ZHENG YuXia~1 & ZHANG YunHong~1* 1The Institute of Chemical Physics,School of Science,Beijing Institute of Technology,Beijing 100081,China,2Chemistry Department,School of Physics and Chemistry,Henan Polytechnic University,Jiaozuo 454000 |
| Abstract: | Temporally and spatially resolved investigations of the efflorescence of equimolar mixtures of ammonium sulfate (AS) and ammonium nitrate (AN) aerosol droplets were performed by confocal Raman spectroscopy combined with high-speed photography. Information was obtained on the dynamic process of morphological changes and the heterogeneous distribution of efflorescence products. The supersaturated AS/AN mixed droplet was found to first precipitate as the double salt 3AN·AS when the relative humidity was 50%. The excess AS was irregularly distributed on the surface of the double salt as an inclusion structure. No formation of 2AN·AS was observed throughout the efflorescence process. |
| Keywords: | confocal Raman high-speed photography ammonium sulfate ammonium nitrate double salt |
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