On the measurement of the fractal dimension of aggregated particles by electron microscopy : experimental method, corrections and comparison with numerical models
نویسندگان
چکیده
Digital annular dark-field images of aggregated iron polydisperse particles are obtained using a computer-controlled STEM. Different methods are discussed on how to extract the fractal dimension of the aggregates, and the sources of error are analysed. The results are compared with computer simulations on a polydisperse version of the cluster-cluster aggregation model. Simulations show that polydispersity does not affect the fractal dimension. The experimental result for the fractal dimension ( D =1.9 ± 0.1) is consistent with the cluster-cluster model with linear trajectories. J. Physique 47 (1986) 1989-1998 NOVEMBRE 1986, Classification Physics Abstracts 61.14 05.40
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