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Abstract : We report small angle static light scattering measurements on colloidal aggregation at high monomer volume fractions. The structure factor Sq exhibits a pronounced maximum at a finite wave vector qm at any stage during the aggregation reaction. In the later stages the structure factor scales accordng to a universal law similar to that of spinodal decomposition dynamics : MATH. At variance with spinodal decomposition, where d = 3, we find d = df, the fractal dimension of colloidal clusters. The aggregation stops when the peak position reaches a certain value q* which depends on the monomer concentration. The terminal stage occurs when all the sample is filled with close packing fractal clusters of size R α 1-q





Author: M. Carpineti M. Giglio

Source: https://hal.archives-ouvertes.fr/



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