Abstract
The phase state of secondary organic aerosol (SOA) has an impact on its lifetime, composition, and its interaction with water. To better understand the effect of phase state of SOA on climate interactions, we studied the SOA phase state and the effect of its history and report here the phase state and the humidity-induced phase hysteresis of multicomponent-seeded SOA particles produced in a large, continuously stirred tank reactor. We determined the phase state of the particles by their bounced fraction impacting on a smooth substrate in a low-pressure impactor. The particles were composed of ammonium sulfate ([NH4](2)SO4) seed and a secondary organic matter (SOM) shell formed from oxidized alpha-pinene or isoprene. The ammonium sulfate (AS) seed dominated the deliquescence of the alpha-pinene SOM multicomponent particles, whereas their efflorescence was strongly attenuated by the SOM coating. Particles coated with isoprene SOM showed continuous phase transitions with a lesser effect by the AS seed. The results agree with and independently corroborate contemporary research.
Copyright 2015 American Association for Aerosol Research
| Original language | English |
|---|---|
| Pages (from-to) | 531-537 |
| Number of pages | 7 |
| Journal | Aerosol Science and Technology |
| Volume | 49 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 3 Jul 2015 |
| Publication type | A1 Journal article-refereed |
Keywords
- MIXED PARTICLES
- ALPHA-PINENE
- RELATIVE-HUMIDITY
- DARK OZONOLYSIS
- GLASSY AEROSOL
- SOA PARTICLES
- WATER
- EFFLORESCENCE
- SEPARATION
- MISCIBILITY
Publication forum classification
- Publication forum level 2