Ternary nucleation as a mechanism for the production of diesel nanoparticles : Experimental analysis of the volatile and hygroscopic properties of diesel exhaust using the volatilization and humidification tandem differential mobility analyzer

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

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Author(s)

  • N. K. Meyer
  • Z. D. Ristovski

Detail(s)

Original languageEnglish
Pages (from-to)7309-7314
Journal / PublicationEnvironmental Science and Technology
Volume41
Issue number21
Publication statusPublished - 1 Nov 2007
Externally publishedYes

Abstract

The volatile and hygroscopic properties of diesel nanoparticles were simultaneously determined under a range of engine loads using the volatilization and humidification tandem differential mobility analyzer (VH-TDMA). Additionally, the VH-TDMA was used to measure changes in the hygroscopic behavior of the heterogeneously nucleated diesel nanoparticles as one or more semivolatile species were removed via thermal evaporation or decomposition. Particles produced at high loads exhibited high, dual-step volatility, while those particles produced at low loads were less volatile and exhibited continuous volatilization curves. The hygroscopic growth factor of the particles was shown to be load dependent with high-load particles exhibiting growth factors similar to that of ammonium sulfate. At 85% relative humidity, particles produced at moderate loads exhibited growth factors of ∼1.1 while low-load particles were shown to be hydrophobic. Growth factors and volatilization temperatures measured for high-load particles clearly indicate that ternary nucleation is involved in particle formation. © 2007 American Chemical Society.

Citation Format(s)

Ternary nucleation as a mechanism for the production of diesel nanoparticles : Experimental analysis of the volatile and hygroscopic properties of diesel exhaust using the volatilization and humidification tandem differential mobility analyzer. / Meyer, N. K.; Ristovski, Z. D.

In: Environmental Science and Technology, Vol. 41, No. 21, 01.11.2007, p. 7309-7314.

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