Mass-mobility characterization of flame-made ZrO 2 aerosols: Primary particle diameter and extent of aggregation

M. L. Eggersdorfer, A. J. Gröhn, C. M. Sorensen, P. H. McMurry, S. E. Pratsinis

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Gas-borne nanoparticles undergoing coagulation and sintering form irregular or fractal-like structures affecting their transport, light scattering, effective surface area, and density. Here, zirconia (ZrO 2) nanoparticles are generated by scalable spray combustion, and their mobility diameter and mass are obtained nearly in situ by differential mobility analyzer (DMA) and aerosol particle mass (APM) measurements. Using these data, the density of ZrO 2 and a power law between mobility and primary particle diameters, the structure of fractal-like particles is determined (mass-mobility exponent, prefactor and average number, and surface area mean diameter of primary particles, d va). The d va determined by DMA-APM measurements and this power law is in good agreement with the d va obtained by ex situ nitrogen adsorption and microscopic analysis. Using this combination of measurements and above power law, the effect of flame spray process parameters (e.g., precursor solution and oxygen flow rate as well as zirconium concentration) on fractal-like particle structure characteristics is investigated in detail. This reveals that predominantly agglomerates (physically-bonded particles) and aggregates (chemically- or sinter-bonded particles) of nanoparticles are formed at low and high particle concentrations, respectively.

Original languageEnglish (US)
Pages (from-to)12-23
Number of pages12
JournalJournal of Colloid And Interface Science
Volume387
Issue number1
DOIs
StatePublished - Dec 1 2012

Keywords

  • Cluster-cluster agglomerate
  • Differential mobility analyzer
  • Fractal-like particle characterization
  • Surface area mean primary particle diameter
  • Zirconia

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