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SURFACTANT PARTITIONING IN CLOUD DROPLET ACTIVATION: A STUDY OF C8, C10, C12 and C14 NORMAL FATTY ACID SODIUM SALTS

Prisle, Nønne L.; Raatikainen, Tomi; Sorjamaa, Riikka; Svenningsson, Birgitta LU ; Laaksonen, Ari and Bilde, Merete (2008) In Tellus 60. p.416-431
Abstract
We have measured critical supersaturations of dried single component particles of sodium caprylate (CH3(CH2)6COONa), sodium caprate (CH3(CH2)8COONa), sodium laurate (CH3(CH2)10COONa) and sodium myristate (CH3(CH2)12COONa), respectively, in the diameter range 33-140 nm at 296 K using a static thermal gradient diffusion cloud condensation nucleus counter. These fatty acid sodium salts are surface active molecules which have all been identified in atmospheric aerosol particles. Experimental critical supersaturations increased systematically with increasing carbon chain length and were in the range 0.96-1.34% for particles with a dry diameter of 40 nm. The experimental data were modeled using Köhler theory modified to account for partitioning... (More)
We have measured critical supersaturations of dried single component particles of sodium caprylate (CH3(CH2)6COONa), sodium caprate (CH3(CH2)8COONa), sodium laurate (CH3(CH2)10COONa) and sodium myristate (CH3(CH2)12COONa), respectively, in the diameter range 33-140 nm at 296 K using a static thermal gradient diffusion cloud condensation nucleus counter. These fatty acid sodium salts are surface active molecules which have all been identified in atmospheric aerosol particles. Experimental critical supersaturations increased systematically with increasing carbon chain length and were in the range 0.96-1.34% for particles with a dry diameter of 40 nm. The experimental data were modeled using Köhler theory modified to account for partitioning of the surface active fatty acid sodium salts between the droplet bulk and surface as well as Köhler theory including surface tension reduction without accounting for surfactant partitioning. It was found that Köhler theory using the reduced surface tension with no account for surfactant partitioning under predicts experimental critical supersaturations significantly, whereas Köhler theory modified to account for surfactant partitioning reproduced the experimental data well. (Less)
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author
organization
publishing date
type
Contribution to specialist publication or newspaper
publication status
published
subject
categories
Popular Science
in
Tellus
volume
60
pages
416 - 431
publisher
Wiley-Blackwell
external identifiers
  • Scopus:45449100160
ISSN
0040-2826
language
English
LU publication?
no
id
83fa3b71-9409-47bf-8d79-acc7a372ebd5 (old id 694357)
date added to LUP
2007-12-07 17:27:21
date last changed
2017-01-01 08:15:54
@misc{83fa3b71-9409-47bf-8d79-acc7a372ebd5,
  abstract     = {We have measured critical supersaturations of dried single component particles of sodium caprylate (CH3(CH2)6COONa), sodium caprate (CH3(CH2)8COONa), sodium laurate (CH3(CH2)10COONa) and sodium myristate (CH3(CH2)12COONa), respectively, in the diameter range 33-140 nm at 296 K using a static thermal gradient diffusion cloud condensation nucleus counter. These fatty acid sodium salts are surface active molecules which have all been identified in atmospheric aerosol particles. Experimental critical supersaturations increased systematically with increasing carbon chain length and were in the range 0.96-1.34% for particles with a dry diameter of 40 nm. The experimental data were modeled using Köhler theory modified to account for partitioning of the surface active fatty acid sodium salts between the droplet bulk and surface as well as Köhler theory including surface tension reduction without accounting for surfactant partitioning. It was found that Köhler theory using the reduced surface tension with no account for surfactant partitioning under predicts experimental critical supersaturations significantly, whereas Köhler theory modified to account for surfactant partitioning reproduced the experimental data well.},
  author       = {Prisle, Nønne L. and Raatikainen, Tomi and Sorjamaa, Riikka and Svenningsson, Birgitta and Laaksonen, Ari and Bilde, Merete},
  issn         = {0040-2826},
  language     = {eng},
  pages        = {416--431},
  publisher    = {Wiley-Blackwell},
  series       = {Tellus},
  title        = {SURFACTANT PARTITIONING IN CLOUD DROPLET ACTIVATION: A STUDY OF C8, C10, C12 and C14 NORMAL FATTY ACID SODIUM SALTS},
  volume       = {60},
  year         = {2008},
}