Dust-Catalyzed Oxidative Polymerization of Catechol and Its Impacts on Ice Nucleation
Efficiency and Optical Properties
Posted on 2020-06-22 - 14:35
Dust is the major source of iron
in atmospheric aerosols but little
is known about its role in catalyzing polymerization reactions of
organics in particles. Using Arizona Test Dust (AZTD) and hematite
nanoparticles as laboratory standards and proxies for hematite-rich
natural dust, respectively, we show that their reactions with catechol
in aqueous slurries lead to the formation of black polycatechol. This
observation is in contrast to oxalate and sulfate which form surface
complexes promoting the dissolution of iron from the dust particles.
Results from ultraviolet–visible spectroscopy and microscopy/elemental
mapping show that the formation of polycatechol changed the optical
properties of the dust particles and surface chemical composition.
Results from ice nucleation studies using a droplet freezing technique
show that polycatechol did not significantly impact ice nucleation
or block ice nucleation sites on AZTD. In contrast, increasing pH
decreased the ice nucleation ability of AZTD. These results highlight
the complexity of iron’s role in aerosol aging processes, brown
carbon formation, and ice nucleation.
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Link, Nicole; Removski, Nicole; Yun, Jingwei; Fleming, Lauren T.; Nizkorodov, Sergey A.; Bertram, Allan K.; et al. (2020). Dust-Catalyzed Oxidative Polymerization of Catechol and Its Impacts on Ice Nucleation
Efficiency and Optical Properties. ACS Publications. Collection. https://doi.org/10.1021/acsearthspacechem.0c00107
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AUTHORS (7)
NL
Nicole Link
NR
Nicole Removski
JY
Jingwei Yun
LF
Lauren T. Fleming
SN
Sergey A. Nizkorodov
AB
Allan K. Bertram
HA
Hind A. Al-Abadleh
KEYWORDS
block ice nucleation sitesIce Nucleation EfficiencyArizona Test Dustcontrastformationice nucleation abilityAZTDpolycatecholcatalyzing polymerization reactionsOptical Properties Dustform surface complexesice nucleation studiesimpact ice nucleationDust-Catalyzed Oxidative Polymerizationsurface chemical compositionroledust particlesaerosol