Kinetically Determined Hygroscopicity and Efflorescence of Sucrose-Ammonium Sulfate Aerosol Droplets under Lower Relative Humidity

Lin Na Wang, Chen Cai*, Yun Hong Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Organic aerosols will likely form in semisolid, glassy, and high viscous state in the atmosphere, which show nonequilibrium kinetic characteristics at low relative humidity (RH) conditions. In this study, we applied optical tweezers to investigate the water transport in a sucrose/(NH4)2SO4 droplet with high organic to inorganic mole ratio (OIR). The characteristic time ratio between the droplet radius and the RH was used to describe the water mass transfer difference dependent on RH. For OIR greater than 1:1 in sucrose/(NH4)2SO4 droplets, the characteristic time ratio at low RH (<∼30% RH) was two orders magnitude greater than that at high RH (>∼60%). We also coupled vacuum FTIR spectrometer and a high-speed photography to study the efflorescence process in sucrose/(NH4)2SO4 droplets with low OIR. The crystalline fraction of (NH4)2SO4 was used to understand efflorescence behavior when the RH was linearly decreasing with a velocity of 1.2% RH min-1. Because of suppression of (NH4)2SO4 nucleation by addition of sucrose, the efflorescence relative humidity (ERH) of (NH4)2SO4 decrease from the range of ∼48.2% to ∼36.1% for pure (NH4)2SO4 droplets to from ∼44.7% to ∼25.4%, from ∼43.2% to ∼21.2%, and from ∼41.7% to ∼21.1% for the mixed droplets with OIR of 1:4, 1:3, and 1:2, respectively. No crystallization was observed when the OIR is higher than 1:1. Suppression of (NH4)2SO4 crystal growth was also observed under high viscous sucrose/(NH4)2SO4 droplets at lower RH. (Graph Presented).

Original languageEnglish
Pages (from-to)8551-8557
Number of pages7
JournalJournal of Physical Chemistry B
Volume121
Issue number36
DOIs
Publication statusPublished - 14 Sept 2017

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