Wetting and hydration of insoluble soot particles in the upper troposphere

Wettability and hydration are determined for aircraft combustor and laboratory-made soots which are used as surrogates for the insoluble part of aircraft-generated black carbon particles in the upper troposphere (UT). The measured water/ice contact angles on the soot surfaces are in the range 60-80...

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Bibliographic Details
Published inJournal of environmental monitoring Vol. 6; no. 12; p. 939
Main Authors Persiantseva, N M, Popovicheva, O B, Shonija, N K
Format Journal Article
LanguageEnglish
Published England 01.12.2004
Subjects
Air Pollutants
Aircraft
Atmosphere - chemistry
Carbon - chemistry
Fossil Fuels
Ice
Kerosene
Solubility
Water - chemistry
Wettability
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Summary:Wettability and hydration are determined for aircraft combustor and laboratory-made soots which are used as surrogates for the insoluble part of aircraft-generated black carbon particles in the upper troposphere (UT). The measured water/ice contact angles on the soot surfaces are in the range 60-80 degrees. Factors influencing the soot wetting show a tremendous dependence on the surface chemical composition and microstructure. Wetting characteristics of soots are directly related to its hydrophilicity. The inverse Kelvin effect is considered as a mechanism of ice nucleation which is facilitated by the soot agglomerated structure with interparticle cavities in which condensation takes place on the insoluble surface with a high water contact angle. Estimations of the critical supersaturations needed for the ice condensation growth of particles are provided to determine which of the wetting characteristics are required for cirrus cloud formation in ice saturated regions of the UT.
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ISSN:1464-0325
1464-0333
DOI:10.1039/b407770a