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Direct imaging of changes in aerosol particle viscosity upon hydration and chemical aging
- Source :
- Hosny, NA; Fitzgerald, C; Vysniauskas, A; Athanasiadis, A; Berkemeier, T; Uygur, N; et al.(2016). Direct imaging of changes in aerosol particle viscosity upon hydration and chemical aging. CHEMICAL SCIENCE, 7(2), 1357-1367. doi: 10.1039/c5sc02959g. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/7j7128dt
- Publication Year :
- 2016
- Publisher :
- Royal Society of Chemistry, 2016.
-
Abstract
- Organic aerosol particles (OA) play major roles in atmospheric chemistry, climate, and public health. Aerosol particle viscosity is highly important since it can determine the ability of chemical species such as oxidants, organics or water to diffuse into the particle bulk. Recent measurements indicate that OA may be present in highly viscous states, however, diffusion rates of small molecules such as water are not limited by these high viscosities. Direct observational evidence of kinetic barriers caused by high viscosity and low diffusivity in aerosol particles were not available until recently; and techniques that are able to dynamically quantify and track viscosity changes during atmospherically relevant processes are still unavailable for atmospheric aerosols. Here we report quantitative, real-time, online observations of microscopic viscosity changes in aerosol particles of atmospherically relevant composition, using fluorescence lifetime imaging (FLIM) of viscosity. We show that microviscosity in ozonated oleic acid droplets and secondary organic aerosol (SOA) particles formed by ozonolysis of myrcene increases substantially with decreasing humidity and atmospheric oxidative aging processes. Furthermore, we found unexpected heterogeneities of microviscosity inside individual aerosol particles. The results of this study enhance our understanding of organic aerosol processes on microscopic scales and may have important implications for the modeling of atmospheric aerosol growth, composition and interactions with trace gases and clouds.
- Subjects :
- 010504 meteorology & atmospheric sciences
Chemistry, Multidisciplinary
OZONOLYSIS
010402 general chemistry
01 natural sciences
complex mixtures
Microviscosity
ICE NUCLEATION
Viscosity
SECONDARY ORGANIC AEROSOL
0399 Other Chemical Sciences
Diffusion (business)
0105 earth and related environmental sciences
0306 Physical Chemistry (incl. Structural)
Science & Technology
Chemistry
General Chemistry
OLEIC-ACID
WATER DIFFUSION
LIVE CELLS
STATE
0104 chemical sciences
Aerosol
Trace gas
MODEL
ATMOSPHERIC AEROSOLS
13. Climate action
Chemical physics
Environmental chemistry
Atmospheric chemistry
Physical Sciences
Ice nucleus
Particle
03 Chemical Sciences
PHASE-SEPARATION
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Hosny, NA; Fitzgerald, C; Vysniauskas, A; Athanasiadis, A; Berkemeier, T; Uygur, N; et al.(2016). Direct imaging of changes in aerosol particle viscosity upon hydration and chemical aging. CHEMICAL SCIENCE, 7(2), 1357-1367. doi: 10.1039/c5sc02959g. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/7j7128dt
- Accession number :
- edsair.doi.dedup.....f4c7b79d9e1ef75c1f671224cfa51a0e