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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Comparison of three methods of fractal analysis applied to soot aggregates from wood combustion
Journal of Aerosol Science, Volume 37, No. 7, Year 2006
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Description
The morphological and dynamic properties of fractal-like particles produced from the combustion of wood are studied in this work. Particles with electrical mobility diameters of 200, 275, 350 and 450 nm were deposited on filters and imaged using a high-resolution scanning electron microscope (SEM). The soot particles consisted of aggregated primary spheres with mean radius ap = 25.5 ± 3.5 nm and standard deviation σg = 1.27 ± 0.09. The fractal dimension of the aggregates, Df, was derived from three techniques: (1)Df = 1.84 ± 0.05 from the projected surfaces in the SEM images; (2)Df = 1.83 ± 0.05 from the relationship between number of primary particles per aggregate N, and radius of gyration Rg; (3)Df = 1.80 ± 0.13 from the relationship of mobility and N. Thus, there is agreement between the three techniques with an average Df of 1.83. The dynamic shape factors of the soot particles were between 1.5 and 2.5 and increasing with N. In the regime 0.2 < Kn < 0.7 (Knudsen number, Kn = 2 λ / dmob), the mobility diameter dmob was observed to be proportional to the radius of gyration with a ratio dmob / 2 Rg = 0.81 ± 0.07. The specific surface area of the aggregates was determined to be 70 ± 10 m2 / g, based on SEM image analysis. © 2005 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Gwaze, Patience
Germany, Mainz
Max Planck Institute for Chemistry
South Africa, Johannesburg
University of the Witwatersrand
Schmid, Otmar
Germany, Mainz
Max Planck Institute for Chemistry
South Africa, Johannesburg
University of the Witwatersrand
Annegarn, Harold
South Africa, Johannesburg
University of Johannesburg
Andreae, Meinrat O.
Germany, Mainz
Max Planck Institute for Chemistry
Huth, Joachim
Germany, Mainz
Max Planck Institute for Chemistry
Helas, Günther
Germany, Mainz
Max Planck Institute for Chemistry
Statistics
Citations: 104
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1016/j.jaerosci.2005.06.007
ISSN:
00218502