HR: 1340h
AN: A53A-0172    [Abstracts]
TI: Three-dimensional Analysis of Individual Soot Aggregates
AU: * Adachi, K
EM: Kouji.Adachi@asu.edu
AF: Arizona State University, Dept. of Geological Sciences/Chemistry and Biochemistry, Tempe, AZ 85287 United States
AU: Friedrich, H
EM: heiner.friedrich@asu.edu
AF: Arizona State University, Dept. of Geological Sciences/Chemistry and Biochemistry, Tempe, AZ 85287 United States
AU: Spinsby, J
EM: jacob.spinsby@asu.edu
AF: Arizona State University, Dept. of Geological Sciences/Chemistry and Biochemistry, Tempe, AZ 85287 United States
AU: Tohno, S
EM: tohno@energy.kyoto-u.ac.jp
AF: Kyoto University, Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Uji, 611-0011 Japan
AU: Okumura, M
EM: moto.0313@uji.energy.kyoto-u.ac.jp
AF: Kyoto University, Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Uji, 611-0011 Japan
AU: Buseck, P R
EM: pbuseck@asu.edu
AF: Arizona State University, Dept. of Geological Sciences/Chemistry and Biochemistry, Tempe, AZ 85287 United States
AB: Using electron tomography with a transmission electron microscope (TEM), we measured and quantified three-dimensional (3D) information for individual soot aggregates from Asian dust and a diesel vehicle. Soot aggregates are significant factors for evaluating and predicting global climate change. Many studies have been done to determine the physical properties of the individual particles. However, because soot particles have complex structures that are not fully visible in 2D images, with projecting parts and pores overlapping one another, it has been difficult to describe and properly quantify their properties. We are using electron tomography to reconstruct 3D data from series of 2D TEM images obtained at various tilt angles. The results have allowed determination of volume, surface area, maximum length, fractal dimension, and the number of primary particles within given soot aggregates. The Asian dust samples contain mineral dust and anthropogenic particles such as soot, fly ash, and metal particles from Chinese industrial areas, which are major sources of pollutants. From the 3D analyses, we found that the volumes, surface areas, and fractal dimensions of our primary Asian dust particles are generally larger than those of the diesel soot. The generality of this result remains to be tested.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0394 Instruments and techniques
DE: 1630 Impacts of global change (1225)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005