Journal
AEROSOL SCIENCE AND TECHNOLOGY
Volume 44, Issue 3, Pages 182-186Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/02786820903499462
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- U.S. Department of Energy [DEFG02-91-ER45439]
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Transmission electron microscopy has been used to evaluate the primary particle size distributions and aggregate structure of a fumed silica sample. The primary particle size distribution within an individual aggregate is narrow, with a geometric standard deviation of similar to 1.2. The distributions of maximum diameters, projected areas, and average primary particle diameters were all skewed, and all were better described by a log-normal distribution than a normal distribution. The data confirmed the fractal description of the fumed silica aggregate structure, with a mass fractal dimension of 1.86. The fractal prefactor or lacunarity was evaluated from the aggregate volume and the maximum particle dimension, and found to have a value of 0.83 for this sample.
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