Geophysical Research Letters
Supporting Information for
Redistribution of black carbon in aerosol particles undergoing liquid-liquid phase
separation
S. Brunamonti 1, U. K. Krieger 1, C. Marcolli 1, 2 and T. Peter 1
1 ETH
2 Marcolli
Zürich, Institute for Atmospheric and Climate Science,
Chemistry and Physics Consultings GmbH, Zürich, Switzerland
Contents of this file
Text S1
Figure S1
Table S1
Introduction
Text S1 and Table S1 provide a detailed characterization of the investigated BC samples,
respectively by supplying additional general information (Text S1) and summarizing their
main physical and chemical properties (Table S1). Figure S1 shows plots of absorption
efficiency as a function of wavelength for all the internally-mixed scenarios discussed in
the main text, simulated using the Mie theory algorithm by Kaiser and Schweiger [1993].
Text S1.
The investigated BC samples, FW 200 (gas black) and LB 101 (lamp black) by Orion
Engineered Carbons, consist of solid BC particles with sub-micrometer primary particle
size, often stuck together to form aggregates with sizes up to few millimeters. They are
respectively generated by incomplete combustion of gaseous hydrocarbons (gas black)
and of liquid fossil fuels in a lamp (lamp black). Analogous commercial BC products,
namely FW2 and LB by Degussa, were investigated and characterized in previous
atmosphere-related studies [Popovicheva et al., 2008; Kireeva et al., 2009]. Table S1
summarizes the main chemical and morphological properties of such materials, which are
either specified by the supplier or retrieved from the studies mentioned above.
1
Figure S1. Absorption efficiency as a function of wavelengt in the visible spectrum (390700 nm) for the volume-mixing (VM), inverted core-shell (ICS) and core-shell (CS)
scenarios, with constant droplet radius (R) and BC volume fraction (FBC). Panel A: R = 145
nm. Panel B: R = 400 nm. FBC = 15 % for both panels. Mean values of these curves give
the average visible absorption efficiencies (Q) which are plotted as a function of droplet
radius in Figure 4, panel A of the main text.
BC type
d (nm)
S (m2/g)
ρ0 (g/cm3)
θ (deg.)
Volatile (%)
WSF (%)
Gas black
131,2
4202,3
0.32,3
402,3
7.92
1.13
Lamp black
951,2
222,3
0.152,3
322,3
0.62
0.43
Table S1. Summary of physical and chemical properties of the investigated BC samples.
The following quantities are shown (for definitions and measurement techniques, see
references below): average primary particle size (d), specific surface area (S), apparent
density (ρ0), contact angle (θ), volatile organic fraction (Volatile, expressed in wheight
percentage) and water soluble fraction (WSF, expressed in wheight percentage). Data
with superscript 1: specified by Orion Engineered Carbons for FW 200 (gas black) and LB
101 (lamp black); data with superscript 2: from Popovicheva et al. [2008] for FW2 (gas
black) and LB (lamp black) by Degussa; data with superscript 3: from Kireeva et al. [2009]
for FW2 (gas black) and LB (lamp black) by Degussa.
2