TY - JOUR
T1 - Mass-mobility characterization of flame-made ZrO 2 aerosols
T2 - Primary particle diameter and extent of aggregation
AU - Eggersdorfer, M. L.
AU - Gröhn, A. J.
AU - Sorensen, C. M.
AU - McMurry, P. H.
AU - Pratsinis, S. E.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - 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.
AB - 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.
KW - Cluster-cluster agglomerate
KW - Differential mobility analyzer
KW - Fractal-like particle characterization
KW - Surface area mean primary particle diameter
KW - Zirconia
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U2 - 10.1016/j.jcis.2012.07.078
DO - 10.1016/j.jcis.2012.07.078
M3 - Article
C2 - 22959835
AN - SCOPUS:84866599021
SN - 0021-9797
VL - 387
SP - 12
EP - 23
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 1
ER -