Structure and kinetics of formation of APTS/GPTS-derived organic/inorganic hybrids
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The structure and the kinetics of formation of APTS/GPTS-derived organic/inorganic hybrids were studied in situ by small-angle-X-ray scattering. The data were interpreted in terms of a process of primary particles formation and growth of mass-fractal clusters. At the very early stage, the population of the nonfractal primary particles (D = 3) increases with time. As the mass-fractal clusters appear (D < 3) as a result of the aggregation process, the radius of gyration, Rg, of the clusters increases on average. At advanced stages of aggregation, the clusters grow in a mechanism in which the number of particles per clusters increases while the number of clusters diminishes with time, in such a way that the correlation volume of the clusters, Vc, fulfills the relationship Vc â̂ R g D, in agreement with a mass-fractal character of the clusters. These results supporting a cluster-cluster aggregation process, together with the typically very low value found for the mass-fractal dimension D, are in favor of a diffusion-controlled cluster aggregation mechanism. © 2013 American Chemical Society.
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Aggregation process, Cluster aggregation, Cluster-cluster aggregation, Diffusion-controlled, Number of clusters, Organic/Inorganic hybrids, Primary particles, Radius of gyration, Fractal dimension, Agglomeration
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Inglês
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Journal of Physical Chemistry C, v. 117, n. 34, p. 17839-17844, 2013.
