Cloud condensation nuclei activation of limited solubility organic aerosol

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Kara E. Huff Hartz
  • Joshua E. Tischuk
  • Man Nin Chan
  • Neil M. Donahue
  • Spyros N. Pandis

Detail(s)

Original languageEnglish
Pages (from-to)605-617
Journal / PublicationAtmospheric Environment
Volume40
Issue number4
Publication statusPublished - Feb 2006
Externally publishedYes

Abstract

The cloud condensation nuclei (CCN) activation of 19 organic species with water solubilities (Csat) ranging from 10-4 to 10 2 g solute 100 g-1 H2O was measured. The organic particles were generated by nebulization of an aqueous or an alcohol solution. Use of alcohols as solvents enables the measurement of low solubility, non-volatile organic CCN activity and reduces the likelihood of residual water in the aerosol. The activation diameter of organic species with very low solubility in water (Csat-1 H2O) is in agreement with Köhler theory using the bulk solubility (limited solubility case) of the organic in water. Many species, including 2-acetylbenzoic acid, aspartic acid, azelaic acid, glutamic acid, homophthalic acid, phthalic acid, cis-pinonic acid, and salicylic acid are highly CCN active in spite of their low solubility (0.3 g 100 g-1 H2O<Csat-1 H2O), and activate almost as if completely water soluble. The CCN activity of most species is reduced, if the particles are produced using non-aqueous solvents. The existence of the particles in a metastable state at low RH can explain the observed enhancement in CCN activity beyond the levels suggested by their solubility. © 2005 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Cloud droplet activation, Hygroscopicity, Köhler theory, Organic aerosol, Surface tension

Citation Format(s)

Cloud condensation nuclei activation of limited solubility organic aerosol. / Huff Hartz, Kara E.; Tischuk, Joshua E.; Chan, Man Nin; Chan, Chak K.; Donahue, Neil M.; Pandis, Spyros N.

In: Atmospheric Environment, Vol. 40, No. 4, 02.2006, p. 605-617.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review