Image analysis of fractal aggregates of precipitated silica
Amorphous silica usually appears as a set of more or less spherical particles of a few hundred angstroms in diameter, building up extended aggregates. To understand how the shape of the aggregates observed by electron microscopy is related to the synthesis process, we have simulated by DLA and CCA models the way in which the elementary particles connect to each other. We study in particular how two-dimensional images inform us of the actual three-dimensional structure of the fractal aggregates. Results demonstrate the possibility of describing the morphology of precipitated silica using these models. A better understanding and a better control of the aggregation step seems possible by using these methods.
Key wordsPrecipitated silica image analysis aggregates fractal dimension numerical models
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