Vacuum FTIR observation on hygroscopic properties and phase transition of malonic acid aerosols

被引：15
|
作者：
Shao, Xu [1 ]
Zhang, Yun [1 ]
Pang, Shu-Feng [1 ]
Zhang, Yun-Hong [1 ]
机构：
[1] Beijing Inst Technol, Sch Chem, Inst Chem Phys, Beijing 100081, Peoples R China
来源：
CHEMICAL PHYSICS | 2017年 / 483卷
基金：
中国国家自然科学基金;
关键词：
Malonic acid; Hydrogen-bonds; Efflorescence; Nucleation rates; MIXED AMMONIUM-SULFATE; VOLATILITY; DROPLETS; BEHAVIOR;
D O I：
10.1016/j.chemphys.2016.11.001
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A novel approach based on a combination of a pulse relative humidity (RH) controlling system and a rapid scan vacuum FTIR spectrometer was utilized to investigate the hygroscopic property and phase transition of malonic acid (MA) aerosols. By using this approach, both water vapor amount around the aerosols and water content within aerosols with sub-second time resolution were obtained. Based on the features of FTIR absorbing bands, it can be known that the evolution of hydrogen-bonding structures of tnalonic acid aerosols took place from (H2O)-MA to MA-MA accompanying with phase transition in the dehumidifying process. And in present paper, the stepwise efflorescence of MA aerosols and nucleation rates at different RHs are first reported. Our observation has shown that the efflorescence of MA started at,similar to,17% RH and the nucleation rates increased with decreasing RH. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：7 / 11
页数：5
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