Temporally and spatially resolved investigation on the efflorescence process of a mixed droplet of ammonium sulfate and ammonium nitrate

• 来源期刊: 科学通报(英文版)
• 学科: 化学
• 年，卷（期）: 2011,（24）
• 页码范围: 2600-2603
• 页数: 4页
• 分类号: O611.3
• 语种: 中文

摘要

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.